Sample records for palladium 118 target

  1. Production of Palladium-103 ( 103Pd) from a thin rhodium foil target - Improved cooling concept

    NASA Astrophysics Data System (ADS)

    Silverman, I.; Lavie, E.; Arenshtam, A.; Kijel, D.; Vaknin, D.; Veinguer, M.; Nagler, A.

    2007-08-01

    Palladium-103 (103Pd) is one of the commonly used radioisotopes for prostate cancer treatment. The current irradiation technique used to produce this radioisotope suffers from several serious inherent drawbacks, of which one is the low beam current due to cooling limitation and the other is the electroplating process used to prepare the target. A liquid-metal jet impingement target cooling system developed at Soreq NRC demonstrated recently a cooling capacity of 8.4 kW/cm2 while the pressure of the cooling liquid on the target back was less than 1 bar. The latter value implies that the target can be made very thin and that the copper back-plate might be removed. Hence, we propose a new target design based on the use of a thin rhodium foil directly cooled by a liquid-metal such as gallium.

  2. Photonuclear reactions on 112,118,124Sn, natTe, and natHf targets

    NASA Astrophysics Data System (ADS)

    Danagulyan, A. S.; Hovhannisyan, G. H.; Bakhshiyan, T. M.; Avagyan, R. H.; Avetisyan, A. E.; Kerobyan, I. A.; Dallakyan, R. K.

    2014-11-01

    The yields of products of photonuclear reactions on tin targets enriched in the isotopes 112,118,124Sn and on Te and HfO2 targets of natural isotopic composition were measured. The targets were irradiated at the linear electron accelerator of the A.I. Alikhanian National Science Laboratory (Yerevan Physics Institute) at the electron energy of E e = 40 MeV. The dependence of the product yields on the nucleonic composition of the targets was discussed. The isomeric ratios were obtained for the 119 m,g Te, 121 m,g Te, 117 m,g In, and 123 m,g Sn products. The experimental data in question were compared with their theoretical counterparts calculated on the basis of the TALYS 1.4 code. The dependence of the isomeric ratios on the photon energy and on the mass number of the product is considered.

  3. Targeted removal of trichlorophenol in water by oleic acid-coated nanoscale palladium/zero-valent iron alginate beads.

    PubMed

    Chang, Jaewon; Woo, Heesoo; Ko, Myoung-Soo; Lee, Jaesang; Lee, Seockheon; Yun, Seong-Taek; Lee, Seunghak

    2015-08-15

    A new material was developed and evaluated for the targeted removal of trichlorophenol (TCP) from among potential interferents which are known to degrade removal activity. To achieve TCP-targeted activity, an alginate bead containing nanoscale palladium/zero-valent iron (Pd/nZVI) was coated with a highly hydrophobic oleic acid layer. The new material (Pd/nZVI-A-O) preferentially sorbed TCP from a mixture of chlorinated phenols into the oleic acid cover layer and subsequently dechlorinated it to phenol. The removal efficacy of TCP by Pd/nZVI-A-O was not affected by co-existing organic substances such as Suwannee River humic acid (SRHA), whereas the material without the oleic acid layer (Pd/nZVI-A) became less effective with increasing SRHA concentration. The inorganic substances nitrate and phosphate significantly reduced the reactivity of Pd/nZVI-A, however, Pd/nZVI-A-O showed similar TCP removal efficacies regardless of the initial inorganic ion concentrations. The influence of bicarbonate on the TCP removal efficacies of both Pd/nZVI-A and Pd/nZVI-A-O was not significant. The findings from this study suggest that Pd/nZVI-A-O, with its targeted, constant reactivity for TCP, would be effective for treating this contaminant in surface water or groundwater containing various competitive substrates. PMID:25819991

  4. Formal total syntheses of classic natural product target molecules via palladium-catalyzed enantioselective alkylation

    PubMed Central

    Liu, Yiyang; Liniger, Marc; McFadden, Ryan M; Roizen, Jenny L; Malette, Jacquie; Reeves, Corey M; Behenna, Douglas C; Seto, Masaki; Kim, Jimin; Mohr, Justin T; Virgil, Scott C

    2014-01-01

    Summary Pd-catalyzed enantioselective alkylation in conjunction with further synthetic elaboration enables the formal total syntheses of a number of “classic” natural product target molecules. This publication highlights recent methods for setting quaternary and tetrasubstituted tertiary carbon stereocenters to address the synthetic hurdles encountered over many decades across multiple compound classes spanning carbohydrate derivatives, terpenes, and alkaloids. These enantioselective methods will impact both academic and industrial settings, where the synthesis of stereogenic quaternary carbons is a continuing challenge. PMID:25383121

  5. Palladium on Plastic Substrates for Plasmonic Devices

    PubMed Central

    Zuppella, Paola; Pasqualotto, Elisabetta; Zuccon, Sara; Gerlin, Francesca; Corso, Alain Jody; Scaramuzza, Matteo; De Toni, Alessandro; Paccagnella, Alessandro; Pelizzo, Maria Guglielmina

    2015-01-01

    Innovative chips based on palladium thin films deposited on plastic substrates have been tested in the Kretschmann surface plasmon resonance (SPR) configuration. The new chips combine the advantages of a plastic support that is interesting and commercially appealing and the physical properties of palladium, showing inverted surface plasmon resonance (ISPR). The detection of DNA chains has been selected as the target of the experiment, since it can be applied to several medical early diagnostic tools, such as different biomarkers of cancers or cystic fibrosis. The results are encouraging for the use of palladium in SPR-based sensors of interest for both the advancement of biodevices and the development of hydrogen sensors. PMID:25585102

  6. The Transcriptional Effects of PCB118 and PCB153 on the Liver, Adipose Tissue, Muscle and Colon of Mice: Highlighting of Glut4 and Lipin1 as Main Target Genes for PCB Induced Metabolic Disorders

    PubMed Central

    Mesnier, Aurélia; Champion, Serge; Louis, Laurence; Sauzet, Christophe; May, Phealay; Portugal, Henri; Benbrahim, Karim; Abraldes, Joelle; Alessi, Marie-Christine; Amiot-Carlin, Marie-Josephe; Peiretti, Franck; Piccerelle, Philippe; Nalbone, Gilles; Villard, Pierre-Henri

    2015-01-01

    Epidemiological studies have associated environmental exposure to polychlorinated biphenyls (PCBs) with an increased risk of type 2 diabetes; however, little is known about the underlying mechanisms involved in the metabolic side-effects of PCB. Our study evaluated the transcriptional effects of a subchronic exposure (gavage at Day 0 and Day 15 with 10 or 100 ?mol/Kg bw) to PCB118 (dioxin-like PCB), PCB153 (non-dioxin-like PCB), or an equimolar mixture of PCB118 and PCB153 on various tissues (liver, visceral adipose tissue, muscle, and colon) in mice. Our results showed that a short-term exposure to PCB118 and/or PCB153 enhanced circulating triglyceride levels but did not affect glycemia. Among the studied tissues, we did not observe any modification of the expression of inflammation-related genes, such as cytokines or chemokines. The main transcriptional effects were observed in visceral adipose and liver tissues. We found a downregulation of lipin1 and glut4 expression in these two target organs. In adipose tissue, we also showed a downregulation of Agpat2, Slc25a1, and Fasn. All of these genes are involved in lipid metabolism and insulin resistance. In muscles, we observed an induction of CnR1 and Foxo3 expression, which may be partly involved in PCB metabolic effects. In summary, our results suggest that lipin1 and glut4, notably in adipose tissue, are the main targeted genes in PCB-induced metabolic disorders, however, further studies are required to fully elucidate the mechanisms involved. PMID:26086818

  7. Study of palladium plating components

    NASA Technical Reports Server (NTRS)

    1977-01-01

    Palladium deposits were prepared by electrolysis for evaluation as catalytic materials. Electrolysis was carried out in acidic solutions consisting of either 1.0 M in NaCl and 0.01 M PdCl2 or 1.0 M NaCl and 0.04 M PdCl2. It was during the preparation of the palladium deposits that unexpected observations were made that led to the request for analytical services. The analyses did not, nor were they intended to, answer all of the questions. They did, however, shed light on the nature and magnitude of some of the contaminants in the solutions and in the palladium electrodes, as well as characterize the forms of the palladium deposits. Results of analyses are grouped into solution, deposit, and electrode categories for comparison purposes.

  8. A novel lead compound CM-118

    PubMed Central

    Meng, Lanfang; Shu, Mengjun; Chen, Yaqing; Yang, Dexiao; He, Qun; Zhao, Hui; Feng, Zhiyong; Liang, Chris; Yu, Ker

    2014-01-01

    The anaplastic lymphoma kinase (ALK) and the c-Met receptor tyrosine kinase play essential roles in the pathogenesis in multiple human cancers and present emerging targets for cancer treatment. Here, we describe CM-118, a novel lead compound displaying low nanomolar biochemical potency against both ALK and c-Met with selectivity over >90 human kinases. CM-118 potently abrogated hepatocyte growth factor (HGF)-induced c-Met phosphorylation and cell migration, phosphorylation of ALK, EML4-ALK, and ALK resistance mutants in transfected cells. CM-118 inhibited proliferation and/or induced apoptosis in multiple c-Met- and ALK-addicted cancer lines with dose response profile correlating target blockade. We show that the CM-118-induced apoptosis in c-Met-amplified H1993 NSCLC cells involved a rapid suppression of c-Met activity and c-Met-to-EGFR cross-talk, and was profoundly potentiated by EGFR inhibitors as shown by the increased levels of apoptotic proteins cleaved-PARP and Bim as well as reduction of the survival protein Mcl-1. Bim-knockdown or Mcl-1 overexpression each significantly attenuated apoptosis. We also revealed a key role by mTOR in mediating CM-118 action against the EML4-ALK-dependent NSCLC cells. Abrogation of EML4-ALK in H2228 cells profoundly reduced signaling capacity of the rapamycin-sensitive mTOR pathway leading to G1 cell cycle arrest and mitochondrial hyperpolarization, a metabolic perturbation linked to mTOR inhibition. Depletion of mTOR or mTORC1 inhibited H2228 cell growth, and mTOR inhibitors potentiated CM-118’s antitumor activity in vitro and in vivo. Oral administration of CM-118 at a wide range of well tolerated dosages diminished c-Met- and ALK phosphorylation in vivo, and caused tumor regression or growth inhibition in multiple c-Met- and ALK-dependent tumor xenografts in mice. CM-118 exhibits favorable pharmacokinetic and drug metabolism properties hence presents a candidate for clinical evaluation. PMID:24618813

  9. Low-cost method for fabricating palladium and palladium-allow thin films on porous supports

    DOEpatents

    Lee, Tae H; Park, Chan Young; Lu, Yunxiang; Dorris, Stephen E; Balachandran, Uthamalingham

    2013-11-19

    A process for forming a palladium or palladium alloy membrane on a ceramic surface by forming a pre-colloid mixture comprising a powder palladium source, carrier fluid, dispersant and a pore former and a binder. Ultrasonically agitating the precolloid mixture and applying to a substrate with an ultrasonic nozzle and heat curing the coating form a palladium-based membrane.

  10. Extracellular Palladium Nanoparticle Production using Geobacter sulfurreducens

    E-print Network

    INTRODUCTION Palladium is a precious metal commonly used in catalytic converters of automobiles to lower catalytic nanoparticles. Palladium nanoparticles can be produced via microbial reduction of soluble Pd capping agents and stabilizers.8 The catalytic activity of biologically supported palladium nano

  11. Synthesis of superheavy elements beyond Z=118

    E-print Network

    Mirea, M; Sandulescu, A

    2008-01-01

    We investigate the cold fission/fusion paths of superheavy nuclei within the two center shell model, in order to find the best projectile-target combinations of their production. The fission/fusion yields are estimated by using the semiclassical approach. We predict several asymmetric combinations of relative long living fragments, which can be used in fusion experiments of superheavy nuclei with Z>118.

  12. Synthesis of superheavy elements beyond Z=118

    E-print Network

    M. Mirea; D. S. Delion; A. Sandulescu

    2008-05-06

    We investigate the cold fission/fusion paths of superheavy nuclei within the two center shell model, in order to find the best projectile-target combinations of their production. The fission/fusion yields are estimated by using the semiclassical approach. We predict several asymmetric combinations of relative long living fragments, which can be used in fusion experiments of superheavy nuclei with Z>118.

  13. Final Hazard Categorization and Auditable Safety Analysis for the Remediation of the 118-D-1, 118-D-2, 118-D-3, 118-H-1, 118-H-2 and 118-H-3 Solid Waste Burial Grounds

    SciTech Connect

    T. J. Rodovsky

    2006-03-01

    This report presents the initial hazard categorization, final hazard categorization and auditable safety analysis for the remediation of the 118-D-1, 118-D-2, and 118-D-3 Burial Grounds located within the 100-D/DR Area of the Hanford Site and the 118-H-1, 118-H-2, and 118-H-3 Burial Grounds located within the 100-H Area of the Hanford Site.

  14. hal-00384928,version1-18May2009 hal-00384928,version1-18May2009

    E-print Network

    Paris-Sud XI, Université de

    hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928,version1-18May2009 #12;hal-00384928

  15. 7 CFR 1260.118 - Cattle.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...Agriculture 10 2014-01-01 2014-01-01 false Cattle. 1260.118 Section 1260.118 Agriculture ...Promotion and Research Order Definitions § 1260.118 Cattle. Cattle means live domesticated bovine animals regardless...

  16. 7 CFR 1260.118 - Cattle.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...Agriculture 10 2012-01-01 2012-01-01 false Cattle. 1260.118 Section 1260.118 Agriculture ...Promotion and Research Order Definitions § 1260.118 Cattle. Cattle means live domesticated bovine animals regardless...

  17. 7 CFR 1260.118 - Cattle.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...Agriculture 10 2013-01-01 2013-01-01 false Cattle. 1260.118 Section 1260.118 Agriculture ...Promotion and Research Order Definitions § 1260.118 Cattle. Cattle means live domesticated bovine animals regardless...

  18. 7 CFR 1260.118 - Cattle.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...Agriculture 10 2011-01-01 2011-01-01 false Cattle. 1260.118 Section 1260.118 Agriculture ...Promotion and Research Order Definitions § 1260.118 Cattle. Cattle means live domesticated bovine animals regardless...

  19. 40 CFR 35.118 - Unexpended balances.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 2011-07-01 false Unexpended balances. 35.118 Section 35.118 Protection...Requirements § 35.118 Unexpended balances. Subject to any relevant provisions...Financial Status Report shows unexpended balances, the Regional Administrator will...

  20. 40 CFR 35.118 - Unexpended balances.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 2010-07-01 false Unexpended balances. 35.118 Section 35.118 Protection...Requirements § 35.118 Unexpended balances. Subject to any relevant provisions...Financial Status Report shows unexpended balances, the Regional Administrator will...

  1. 40 CFR 35.118 - Unexpended balances.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 false Unexpended balances. 35.118 Section 35.118 Protection...Requirements § 35.118 Unexpended balances. Subject to any relevant provisions...Financial Status Report shows unexpended balances, the Regional Administrator will...

  2. 40 CFR 35.118 - Unexpended balances.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 false Unexpended balances. 35.118 Section 35.118 Protection...Requirements § 35.118 Unexpended balances. Subject to any relevant provisions...Financial Status Report shows unexpended balances, the Regional Administrator will...

  3. 40 CFR 35.118 - Unexpended balances.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 false Unexpended balances. 35.118 Section 35.118 Protection...Requirements § 35.118 Unexpended balances. Subject to any relevant provisions...Financial Status Report shows unexpended balances, the Regional Administrator will...

  4. 27 CFR 71.118 - Court review.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    27 Alcohol, Tobacco Products and...2010-04-01 false Court review. 71.118 Section 71.118 Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND...IN PERMIT PROCEEDINGS Review § 71.118 Court...

  5. The Low-Temperature Specific Heat of Palladium - and Palladium-Deuteride

    Microsoft Academic Search

    Leonard Eugene Storm

    1980-01-01

    The low temperature specific heat of palladium hydride and palladium deuteride, as a function of hydrogen (deuterium) content, has been measured in the temperature range from 1.7 K to 7 K, using high purity, bulk samples of polycrystalline palladium. Loading of the sample with hydrogen or deuterium was accomplished using an electrolytic technique. A computer-assisted, adiabatic specific heat apparatus was

  6. Palladium as electrode in DNA sequencing

    NASA Astrophysics Data System (ADS)

    Chen, Xiang

    2013-08-01

    We construct a molecular junction comprising two identical "reader" molecules that are each linked on one end to a DNA single base via hydrogen bonds and on the other end to a palladium electrode. The structure of the junction is thus palladium-reader-base-reader-palladium. The palladium-reader contacts occur via Pd-S bonds. We calculated the electronic structure and conductance of the molecular junctions. Compared with the performance of molecular junctions with gold or titanium nitride electrodes, the current-voltage characteristics of the molecular junctions with palladium electrodes show higher sensitivity to the identity of the bridging DNA base, allowing the DNA bases to be distinguished more easily. Therefore, palladium is a superior electrode for molecular electronics and DNA sequencing.

  7. Electrically conductive palladium containing polyimide films

    NASA Technical Reports Server (NTRS)

    Taylor, L. T.; St.clair, A. K.; Carver, V. C.; Furtsch, T. A. (inventors)

    1982-01-01

    Lightweight, high temperature resistant, electrically conductive, palladium containing polyimide films and methods for their preparation are described. A palladium (II) ion-containing polyamic acid solution is prepared by reacting an aromatic dianhydride with an equimolar quantity of a palladium II ion-containing salt or complex and the reactant product is cast as a thin film onto a surface and cured at approximately 300 C to produce a flexible electrically conductive cyclic palladium containing polyimide. The source of palladium ions is selected from the group of palladium II compounds consisting of LiPdCl4, PdS(CH3)2Cl2Na2PdCl4, and PdCl2. The films have application to aerodynamic and space structures and in particular to the relieving of space charging effects.

  8. Electronic transitions of palladium dimer

    SciTech Connect

    Qian, Yue; Ng, Y. W.; Chen, Zhihua; Cheung, A. S.-C., E-mail: hrsccsc@hku.hk [Department of Chemistry, The University of Hong Kong, Pokfulam Road (Hong Kong)

    2013-11-21

    The laser induced fluorescence spectrum of palladium dimer (Pd{sub 2}) in the visible region between 480 and 700 nm has been observed and analyzed. The gas-phase Pd{sub 2} molecule was produced by laser ablation of palladium metal rod. Eleven vibrational bands were observed and assigned to the [17.1] {sup 3}II{sub g} - X{sup 3}?{sub u}{sup +} transition system. The bond length (r{sub o}) and vibrational frequency (?G{sub 1/2}) of the ground X{sup 3}?{sub u}{sup +} state were determined to be 2.47(4) Å and 211.4(5) cm{sup ?1}, respectively. A molecular orbital energy level diagram was used to understand the observed ground and excited electronic states. This is the first gas-phase experimental investigation of the electronic transitions of Pd{sub 2}.

  9. Tritium Production from Palladium Alloys

    SciTech Connect

    Claytor, T.N.; Schwab, M.J.; Thoma, D.J.; Teter, D.F.; Tuggle, D.G.

    1998-04-19

    A number of palladium alloys have been loaded with deuterium or hydrogen under low energy bombardment in a system that allows the continuous measurement of tritium. Long run times (up to 200 h) result in an integration of the tritium and this, coupled with the high intrinsic sensitivity of the system ({approximately}0.1 nCi/l), enables the significance of the tritium measurement to be many sigma (>10). We will show the difference in tritium generation rates between batches of palladium alloys (Rh, Co, Cu, Cr, Ni, Be, B, Li, Hf, Hg and Fe) of various concentrations to illustrate that tritium generation rate is dependent on alloy type as well as within a specific alloy, dependent on concentration.

  10. Efficient palladium isotope chromatograph for hydrogen (EPIC)

    SciTech Connect

    Embury, M.C.; Ellefson, R.E.; Melke, H.B. (EG and G Mound Applied Technologies, Miamisburg, OH (US))

    1992-03-01

    The Efficient Palladium Isotope Chromatograph (EPIC) is a rapid cycling, computer-operated displacement chromatograph for the separation of hydrogen isotopes. EPIC incorporates several features that optimize product throughput and purity. This paper describes this palladium displacement chromatograph, the operations with protium and deuterium, and the design modifications for operation with tritium.

  11. Polystyrene Palladium Nanocomposite for Hydrogen Sensing

    Microsoft Academic Search

    Massood Z. Atashbar; Deep Banerji; Srikanth Singamaneni; Valery Bliznyuk

    2005-01-01

    In this paper, we report on the structure and hydrogen gas sensing properties of polystyrene palladium nanowire composites. Granular palladium nanowires (with 250 nm diameter) have been electrodeposited on Highly Oriented Pyrolytic Graphite (HOPG). In order to measure the electrical response of the sensor the nanowires were transferred to an insulating polystyrene surface. Polystyrene thin films with the thickness of about

  12. Catalytic palladium-mediated tetraene carbocyclizations

    SciTech Connect

    Takacs, J.M.; Zhu, Jingyang (Univ. of Nebraska, Lincoln (USA))

    1989-10-27

    A new palladium-catalyzed carbocyclization of substrates containing two 1,3-diene moieties leads to the efficient, stereoselective preparation of functionalized cyclopentanes and pyrrolidines. Treatment of tetraenes with 5 mol % of a palladium catalyst and 2-10 equiv of an H-X trapping reagent effects carbocyclization under mild reaction conditions (25-65{degree}C) in good-to-excellent yields (50-94%) and with good to excellent stereoselectivity (5 to >20:1,trans;cis).

  13. 28 CFR 11.8 - Salary offset.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Salary offset. 11.8 Section 11.8 ...Administration of Debt Collection § 11.8 Salary offset. (a) Notice requirements before...Offset a minimum of 30 calendar days before salary offset is initiated. The Notice of...

  14. 28 CFR 11.8 - Salary offset.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Salary offset. 11.8 Section 11.8 ...Administration of Debt Collection § 11.8 Salary offset. (a) Notice requirements before...Offset a minimum of 30 calendar days before salary offset is initiated. The Notice of...

  15. 46 CFR 118.300 - Fire pumps.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Fire pumps. 118.300 Section 118.300 Shipping...EQUIPMENT Fire Main System § 118.300 Fire pumps. (a) A self priming, power driven fire pump must be installed on each vessel....

  16. 46 CFR 118.300 - Fire pumps.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Fire pumps. 118.300 Section 118.300 Shipping...EQUIPMENT Fire Main System § 118.300 Fire pumps. (a) A self priming, power driven fire pump must be installed on each vessel....

  17. 46 CFR 118.300 - Fire pumps.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Fire pumps. 118.300 Section 118.300 Shipping...EQUIPMENT Fire Main System § 118.300 Fire pumps. (a) A self priming, power driven fire pump must be installed on each vessel....

  18. 46 CFR 118.300 - Fire pumps.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Fire pumps. 118.300 Section 118.300 Shipping...EQUIPMENT Fire Main System § 118.300 Fire pumps. (a) A self priming, power driven fire pump must be installed on each vessel....

  19. 46 CFR 118.300 - Fire pumps.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Fire pumps. 118.300 Section 118.300 Shipping...EQUIPMENT Fire Main System § 118.300 Fire pumps. (a) A self priming, power driven fire pump must be installed on each vessel....

  20. 33 CFR 118.130 - Fog signals.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Fog signals. 118.130 Section 118.130...LIGHTING AND OTHER SIGNALS § 118.130 Fog signals. On waterways where visibility is frequently reduced due to fog or other causes, the District...

  1. Calorimetric study on interaction of dioxygen with alumina supported palladium

    Microsoft Academic Search

    Yung-Shen Ho; Chen-Bin Wang; Chuin-Tih Yeh

    1996-01-01

    Pd\\/Al2O3 samples of various palladium loadings were prepared with the incipient-wetness method. With an increase in the palladium loading, the average diameter (d) of palladium crystallites on these samples was estimated from chemisorption of hydrogen to vary from 10 to 80 Å. Also, the phenomena of oxidizing these dispersed palladium crystallites with dioxygen were studied by a simultaneous TG-DSC instrument.

  2. Measurement of palladium crust thickness on catalyst by EPMA

    NASA Astrophysics Data System (ADS)

    Sorbier, L.; Gay, A.-S.; Fécant, A.; Moreaud, M.; Brodusch, N.

    2012-03-01

    Selective hydrogenation is a key process in petrochemistry to obtain good feedstock for polymers synthesis. Common catalysts for this process consist in metallic palladium deposited with an eggshell distribution on porous alumina. For this system, the catalytic activity is known to be in strong relation with the thickness of the palladium crust. Typical catalyst consists of 2 - 4 mm diameter spherical beads having a 200 - 400 ?m thick palladium crust and a total palladium amount of about 0.3 to 0.5 wt%. The palladium distribution in the catalyst bead can be easily characterized by electron probe microanalysis (EPMA) using polished cross-sections of the beads trough their diameter. By measuring the local concentration of palladium on several points along the bead diameter we obtain the distribution profile of palladium in the bead. Two strategies are proposed to measure this palladium crust thickness by EPMA. First the crust thickness is defined by the distance to the catalyst bead surface containing a fixed amount of total palladium (for example 95 % or 98 %). Second, the palladium profile is modelled by a parameterized analytical function from which a crust thickness can be extracted. Catalytic tests on four samples having different palladium crust thicknesses confirm the strong relation between activity and crust thickness. However the crust thickness containing 98 % of the palladium content shows the best correlation with activity.

  3. Thermosonic gold wire bonding to palladium finishes on laminate substrates

    Microsoft Academic Search

    R. Wayne Johnson; Michael Palmer; Mike Bozack; Tamara Isaacs-Smith

    1998-01-01

    As the laminate substrate industry moves from hot air solder level (HASL) finishes, alternate plating finishes are being proposed, such as immersion gold\\/electroless nickel, electroless palladium and electroless silver. This paper presents results of an evaluation of the thermosonic gold ball wire bondability of electroless palladium. Two palladium thicknesses, with and without a nickel underlayer, from two vendors were evaluated.

  4. Effect of Fretting on the Contact Resistance of Palladium

    Microsoft Academic Search

    MORTON ANTLER; EDWARD S. SPROLES

    1982-01-01

    The fretting of palladium contacts was studied at conditions relevant to their use in separable electronic connectors. Wrought, clad, and electroplated palladium mated to wrought palladium develop high contact resistance due to the formation of friction polymer. This can occur in ordinary room air which contains traces of organic air pollutants. Contact resistance changes diminish as force is increased. Static

  5. A SIMPLE, RECYCLABLE, POLYMER-SUPPORTED PALLADIUM CATALYST FOR SUZUKI COUPLING—AN EFFECTIVE WAY TO MINIMIZE PALLADIUM CONTAMINATION

    Microsoft Academic Search

    Wen-Chung Shieh; Ratna Shekhar; Thomas Blacklock; Anthony Tedesco

    2002-01-01

    To address the challenges encountered in homogeneous catalytic processes, such as the minimization of metal contamination and the recycling of the catalysts, a polymer-supported palladium catalyst for Suzuki coupling was developed. The application of this heterogeneous palladium catalyst to the synthesis of a novel, amino-tetralin type, pharmaceutical ingredient led to a very low residual palladium content (<1.1 ppm).

  6. Palladium Implanted Silicon Carbide for Hydrogen Sensing

    NASA Technical Reports Server (NTRS)

    Muntele, C. I.; Ila, D.; Zimmerman, R. L.; Muntele, L.; Poker, D. B.; Hensley, D. K.; Larkin, David (Technical Monitor)

    2001-01-01

    Silicon carbide is intended for use in fabrication of high-temperature, efficient hydrogen sensors. Traditionally, when a palladium coating is applied on the exposed surface of SiC, the chemical reaction between palladium and hydrogen produces a detectable change in the surface chemical potential. We have produced both a palladium coated SiC as well as a palladium, ion implanted SiC sensor. The palladium implantation was done at 500 C into the Si face of 6H, N-type SiC at various energies, and at various fluences. Then, we measured the hydrogen sensitivity response of each fabricated sensor by exposing them to hydrogen while monitoring the current flow across the p-n junction(s), with respect to time. The sensitivity of each sensor was measured at temperatures between 27 and 300 C. The response of the SiC sensors produced by Pd implantation has revealed a completely different behaviour than the SiC sensors produced by Pd deposition. In the Pd-deposited SiC sensors as well as in the ones reported in the literature, the current rises in the presence of hydrogen at room temperature as well as at elevated temperatures. In the case of Pd-implanted SiC sensors, the current decreases in the presence of hydrogen whenever the temperature is raised above 100 C. We will present the details and conclusions from the results obtained during this meeting.

  7. Formation, structure, and reactivity of palladium superoxo complexes

    SciTech Connect

    Talsi, E.P.; Babenko, V.P.; Shubin, A.A.; Chinakov, V.D.; Nekipelov, V.M.; Zamaraev, K.I.

    1987-11-18

    The mechanism of formation of palladium superoxo complexes, their structure, and their reactivity are discussed. The formation of the palladium superoxo complexes in the reaction of palladium(II) acetate, propionate, trifluororacetate, and bis(acetylacetonate) and palladium(0) tetrakis(triphenylphosphine) with hydrogen peroxide and potassium superoxide has been detected in solution by electron proton resonance. The oxidation of olefins and carbon monoxide by these complexes is considered. Reaction mechanisms and reaction kinetics for these oxidations are reported using the palladium superoxo complexes. 44 references, 8 figures, 2 tables.

  8. Sputtered thin-film pH electrodes of platinum, palladium, ruthenium, and iridium oxides

    Microsoft Academic Search

    Kenneth G. Kreider; Michael J. Tarlov; James P. Cline

    1995-01-01

    Thin-film metal oxides have been investigated for use as pH electrodes. These materials may have potential for measuring pH under conditions that are not favorable for glass electrodes. Reactive sputtering of platinum, palladium, ruthenium, and iridium metal targets in argon-oxygen atmospheres is used to produce 1 ?m thick electrodes on alumina and silicon substrates. The structure of the deposits is

  9. 16 CFR 23.7 - Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium,” and “osmium.”

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium...deceptive to use the words “platinum,” “iridium,” “palladium,” “ruthenium...Platinum Group Metals (PGM) are Platinum, Iridium, Palladium, Ruthenium, Rhodium,...

  10. 16 CFR 23.7 - Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium,” and “osmium.”

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium...deceptive to use the words “platinum,” “iridium,” “palladium,” “ruthenium...Platinum Group Metals (PGM) are Platinum, Iridium, Palladium, Ruthenium, Rhodium,...

  11. 16 CFR 23.7 - Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium,” and “osmium.”

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium...deceptive to use the words “platinum,” “iridium,” “palladium,” “ruthenium...Platinum Group Metals (PGM) are Platinum, Iridium, Palladium, Ruthenium, Rhodium,...

  12. 16 CFR 23.7 - Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium,” and “osmium.”

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium...deceptive to use the words “platinum,” “iridium,” “palladium,” “ruthenium...Platinum Group Metals (PGM) are Platinum, Iridium, Palladium, Ruthenium, Rhodium,...

  13. 16 CFR 23.7 - Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium,” and “osmium.”

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... Misuse of the words “platinum,” “iridium,” “palladium,” “ruthenium,” “rhodium...deceptive to use the words “platinum,” “iridium,” “palladium,” “ruthenium...Platinum Group Metals (PGM) are Platinum, Iridium, Palladium, Ruthenium, Rhodium,...

  14. Hydrogen and Palladium Foil: Two Classroom Demonstrations

    ERIC Educational Resources Information Center

    Klotz, Elsbeth; Mattson, Bruce

    2009-01-01

    In these two classroom demonstrations, students observe the reaction between H[subscript 2] gas and Pd foil. In the first demonstration, hydrogen and palladium combine within one minute at 1 atm and room temperature to yield the non-stoichiometric, interstitial hydride with formula close to the maximum known value, PdH[subscript 0.7]. In the…

  15. 33 CFR 118.10 - Interference or obstruction prohibited.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Navigable Waters 1 2010-07-01 2010-07-01 false Interference or obstruction prohibited. 118.10 Section 118.10...BRIDGES BRIDGE LIGHTING AND OTHER SIGNALS § 118.10 Interference or obstruction prohibited. No person shall obstruct...

  16. 32 CFR 536.118 - Related statutes for maritime claims.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Related statutes for maritime claims. 536.118 Section 536.118...ACCOUNTS CLAIMS AGAINST THE UNITED STATES Maritime Claims § 536.118 Related statutes for maritime claims. (a) The AMCSA...

  17. 32 CFR 536.118 - Related statutes for maritime claims.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Related statutes for maritime claims. 536.118 Section 536.118...ACCOUNTS CLAIMS AGAINST THE UNITED STATES Maritime Claims § 536.118 Related statutes for maritime claims. (a) The AMCSA...

  18. 32 CFR 536.118 - Related statutes for maritime claims.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2009-07-01 true Related statutes for maritime claims. 536.118 Section 536.118...ACCOUNTS CLAIMS AGAINST THE UNITED STATES Maritime Claims § 536.118 Related statutes for maritime claims. (a) The AMCSA...

  19. 28 CFR 115.118 - Upgrades to facilities and technologies.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...facilities and technologies. 115.118 Section 115.118 Judicial Administration DEPARTMENT OF JUSTICE (CONTINUED) PRISON RAPE ELIMINATION ACT NATIONAL STANDARDS Standards for Lockups Prevention Planning § 115.118 Upgrades to facilities and...

  20. 28 CFR 115.118 - Upgrades to facilities and technologies.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...facilities and technologies. 115.118 Section 115.118 Judicial Administration DEPARTMENT OF JUSTICE (CONTINUED) PRISON RAPE ELIMINATION ACT NATIONAL STANDARDS Standards for Lockups Prevention Planning § 115.118 Upgrades to facilities and...

  1. 46 CFR 118.500 - Required number, type, and location.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...false Required number, type, and location. 118.500 Section 118.500 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY...PROTECTION EQUIPMENT Portable Fire Extinguishers § 118.500 Required number, type, and location....

  2. 47 CFR 15.118 - Cable ready consumer electronics equipment.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Cable ready consumer electronics equipment. 15.118 Section 15.118...Radiators § 15.118 Cable ready consumer electronics equipment. (a) All consumer electronics TV receiving equipment marketed in...

  3. 47 CFR 15.118 - Cable ready consumer electronics equipment.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Cable ready consumer electronics equipment. 15.118 Section 15.118...Radiators § 15.118 Cable ready consumer electronics equipment. (a) All consumer electronics TV receiving equipment marketed in...

  4. 33 CFR 118.30 - Action by Coast Guard.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Action by Coast Guard. 118.30 Section 118.30 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY...SIGNALS § 118.30 Action by Coast Guard. (a) The District...

  5. 5 CFR 185.118 - Rights of parties.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...2010-01-01 2010-01-01 false Rights of parties. 185.118 Section 185.118 Administrative Personnel OFFICE OF PERSONNEL...SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.118 Rights of parties. Except as otherwise...

  6. 42 CFR 136.118 - Effect on existing rights.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Effect on existing rights. 136.118 Section 136.118...SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES INDIAN HEALTH SERVICE... § 136.118 Effect on existing rights. The regulations in this...

  7. 48 CFR 1371.118 - Changes-ship repair.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Changes-ship repair. 1371.118 Section 1371.118 Federal...DEPARTMENT SUPPLEMENTAL REGULATIONS ACQUISITIONS INVOLVING SHIP CONSTRUCTION AND SHIP REPAIR Provisions and Clauses 1371.118...

  8. 48 CFR 1371.118 - Changes-ship repair.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Changes-ship repair. 1371.118 Section 1371.118 Federal...DEPARTMENT SUPPLEMENTAL REGULATIONS ACQUISITIONS INVOLVING SHIP CONSTRUCTION AND SHIP REPAIR Provisions and Clauses 1371.118...

  9. 48 CFR 1371.118 - Changes-ship repair.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Changes-ship repair. 1371.118 Section 1371.118 Federal...DEPARTMENT SUPPLEMENTAL REGULATIONS ACQUISITIONS INVOLVING SHIP CONSTRUCTION AND SHIP REPAIR Provisions and Clauses 1371.118...

  10. 48 CFR 1371.118 - Changes-ship repair.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Changes-ship repair. 1371.118 Section 1371.118 Federal...DEPARTMENT SUPPLEMENTAL REGULATIONS ACQUISITIONS INVOLVING SHIP CONSTRUCTION AND SHIP REPAIR Provisions and Clauses 1371.118...

  11. 48 CFR 1371.118 - Changes-ship repair.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Changes-ship repair. 1371.118 Section 1371.118 Federal...DEPARTMENT SUPPLEMENTAL REGULATIONS ACQUISITIONS INVOLVING SHIP CONSTRUCTION AND SHIP REPAIR Provisions and Clauses 1371.118...

  12. Process for recovery of palladium from nuclear fuel reprocessing wastes

    DOEpatents

    Campbell, D.O.; Buxton, S.R.

    1980-06-16

    Palladium is selectively removed from spent nuclear fuel reprocessing waste by adding sugar to a strong nitric acid solution of the waste to partially denitrate the solution and cause formation of an insoluble palladium compound. The process includes the steps of: (a) adjusting the nitric acid content of the starting solution to about 10 M; (b) adding 50% sucrose solution in an amount sufficient to effect the precipitation of the palladium compound; (c) heating the solution at reflux temperature until precipitation is complete; and (d) centrifuging the solution to separate the precipitated palladium compound from the supernatant liquid.

  13. Facile hydrolysis and alcoholysis of palladium acetate.

    PubMed

    Bedford, Robin B; Bowen, John G; Davidson, Russell B; Haddow, Mairi F; Seymour-Julen, Annabelle E; Sparkes, Hazel A; Webster, Ruth L

    2015-05-26

    Palladium(II) acetate is readily converted into [Pd3 (?(2) -OH)(OAc)5 ] (1) in the presence of water in a range of organic solvents and is also slowly converted in the solid state. Complex 1 can also be formed in nominally anhydrous solvents. Similarly, the analogous alkoxide complexes [Pd3 (?(2) -OR)(OAc)5 ] (3) are easily formed in solutions of palladium(II) acetate containing a range of alcohols. An examination of a representative Wacker-type oxidation shows that the Pd-OH complex 1 and a related Pd-oxo complex 4 can be excluded as potential catalytic intermediates in the absence of exogenous water. PMID:25865439

  14. 49 CFR 195.118 - Fittings.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... PIPELINE SAFETY TRANSPORTATION OF HAZARDOUS LIQUIDS BY PIPELINE Design Requirements § 195.118 Fittings. (a) Butt-welding type fittings must meet the marking, end preparation, and the bursting strength requirements of ASME/ANSI...

  15. 49 CFR 195.118 - Fittings.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... PIPELINE SAFETY TRANSPORTATION OF HAZARDOUS LIQUIDS BY PIPELINE Design Requirements § 195.118 Fittings. (a) Butt-welding type fittings must meet the marking, end preparation, and the bursting strength requirements of ASME/ANSI...

  16. 49 CFR 195.118 - Fittings.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... PIPELINE SAFETY TRANSPORTATION OF HAZARDOUS LIQUIDS BY PIPELINE Design Requirements § 195.118 Fittings. (a) Butt-welding type fittings must meet the marking, end preparation, and the bursting strength requirements of ASME/ANSI...

  17. 49 CFR 195.118 - Fittings.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... PIPELINE SAFETY TRANSPORTATION OF HAZARDOUS LIQUIDS BY PIPELINE Design Requirements § 195.118 Fittings. (a) Butt-welding type fittings must meet the marking, end preparation, and the bursting strength requirements of ASME/ANSI...

  18. 49 CFR 195.118 - Fittings.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... PIPELINE SAFETY TRANSPORTATION OF HAZARDOUS LIQUIDS BY PIPELINE Design Requirements § 195.118 Fittings. (a) Butt-welding type fittings must meet the marking, end preparation, and the bursting strength requirements of ASME/ANSI...

  19. Dasycladus ramosus, WNC2005-118

    NSDL National Science Digital Library

    Dr. Wilson Freshwater

    2008-03-07

    WNC2005-118, Dasycladus ramosus Chamberlain, intertidal, Jesser Point, Sodwana Bay, Kwazulu-Natal, South Africa, collection SA05-070, 18 Aug 2005, Coll: Brooke Stuercke, Det: B Stuercke & DW Freshwater, voucher for Fritz's study 1 of 2

  20. 32 CFR 644.118 - Awards.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...National Defense Department of Defense (Continued) DEPARTMENT OF THE ARMY (CONTINUED) REAL PROPERTY REAL ESTATE HANDBOOK Acquisition Acquisition by Condemnation Proceedings § 644.118 Awards. (a) Approval by Division or...

  1. 20 CFR 632.118 - Nepotism.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...DEPARTMENT OF LABOR INDIAN AND NATIVE AMERICAN EMPLOYMENT AND TRAINING PROGRAMS...118 Nepotism. (a) No Native American grantee, subgrantee, contractor...administrative capacity by the Native American grantee, subgrantee or...

  2. 20 CFR 632.118 - Nepotism.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...DEPARTMENT OF LABOR INDIAN AND NATIVE AMERICAN EMPLOYMENT AND TRAINING PROGRAMS...118 Nepotism. (a) No Native American grantee, subgrantee, contractor...administrative capacity by the Native American grantee, subgrantee or...

  3. 9 CFR 118.1 - Administrative detention.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...PLANT HEALTH INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE VIRUSES, SERUMS, TOXINS, AND ANALOGOUS PRODUCTS; ORGANISMS AND VECTORS DETENTION; SEIZURE AND CONDEMNATION § 118.1 Administrative detention. Whenever any biological product...

  4. 9 CFR 118.1 - Administrative detention.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...PLANT HEALTH INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE VIRUSES, SERUMS, TOXINS, AND ANALOGOUS PRODUCTS; ORGANISMS AND VECTORS DETENTION; SEIZURE AND CONDEMNATION § 118.1 Administrative detention. Whenever any biological product...

  5. Palladium-catalyzed asymmetric quaternary stereocenter formation.

    PubMed

    Gottumukkala, Aditya L; Matcha, Kiran; Lutz, Martin; de Vries, Johannes G; Minnaard, Adriaan J

    2012-05-29

    An efficient palladium catalyst is presented for the formation of benzylic quaternary stereocenters by conjugate addition of arylboronic acids to a variety of ?,?-disubstituted carbocyclic, heterocyclic, and acyclic enones. The catalyst is readily prepared from PdCl(2), PhBOX, and AgSbF(6), and provides products in up to 99% enantiomeric excess, with good yields. Based on this strategy, (-)-?-cuparenone has been prepared in only two steps. PMID:22532469

  6. Palladium and gold-palladium catalysts for the direct synthesis of hydrogen peroxide.

    PubMed

    Edwards, Jennifer K; Hutchings, Graham J

    2008-01-01

    Today hydrogen peroxide is produced by an indirect process in which an alkyl anthraquinone is sequentially hydrogenated and oxidized. In this way hydrogen and oxygen are kept separate during the manufacturing process. A process where molecular oxygen is directly hydrogenated could be preferred if control of the sequential hydrogenation can be achieved, particularly if high rates can be attained under intrinsically safe, non-explosive conditions. Herein we describe recent progress in the direct synthesis of hydrogen peroxide using supported palladium and gold-palladium alloy catalysts and consider some of the problems that have to be overcome. PMID:18798185

  7. Palladium-catalyzed reaction of allyl halides with a-diazocarbonyl Shufeng Chen and Jianbo Wang*

    E-print Network

    Wang, Jianbo

    Palladium-catalyzed reaction of allyl halides with a-diazocarbonyl compoundsw Shufeng Chen-diazocarbonyl compounds and allyl bromides or chlorides leads to the forma- tion of 1,3-diene derivatives. p-Allylic palladium complexes are important intermediates in palladium-catalyzed reactions.1 The p-allylic palladium

  8. Fabrication and ammonia gas sensing of palladium\\/polypyrrole nanocomposite

    Microsoft Academic Search

    Lijie Hong; Yang Li; Mujie Yang

    2010-01-01

    A nanocomposite of polypyrrole (Ppy) and palladium was fabricated by a facile method involving thermal dynamic refluxing of palladium salt and encapsulation of Pd nanoclusters with Ppy by vapor phase polymerization. The composite film was characterized using transmission electron microscopy and atomic force microscopy. It was found that the morphologies of the composite film were heavily affected by concentration and

  9. Aerobic oxidative amination of unactivated alkenes catalyzed by palladium.

    PubMed

    Brice, Jodie L; Harang, Jenna E; Timokhin, Vitaliy I; Anastasi, Natia R; Stahl, Shannon S

    2005-03-01

    The first examples of palladium-catalyzed oxidative amination of unactivated alkyl olefins have been identified. To be successful, these reactions must be conducted under cocatalyst-free conditions that involve direct dioxygen-coupled turnover of the palladium catalyst. The oxidative amination products of norbornene and other cyclic alkenes implicate a cis-aminopalladation mechanism. PMID:15740119

  10. Effect of Palladium Form on Tetraphenylborate Decomposition Rate

    SciTech Connect

    Walker, D.D. [Westinghouse Savannah River Company, AIKEN, SC (United States)

    1998-04-28

    Palladium catalyzes the decomposition of tetraphenylborate in alkaline solutions. Researchers postulate several decomposition mechanisms that differ in the form of the palladium catalyst. Potential forms include solid and soluble, different soluble species (such as aqueous or organic soluble), and different oxidation states (i.e., 0, II, and IV). Initial tests measured the reactivity and distribution of four Pd forms in tetraphenylborate slurries.

  11. Palladium/Copper-Cocatalyzed Oxidative Amidobrominations of Alkenes.

    PubMed

    Chen, Xiao Yun; Bohmann, Rebekka Anna; Wang, Long; Dong, Shunxi; Räuber, Christoph; Bolm, Carsten

    2015-07-13

    In the presence of LiBr, a palladium/copper combination catalyzes dehydrogenative amidobrominations of acrylates with NH-sulfoximines, leading to N-vinylated products by dual NH/CH coupling, followed by oxidative enamide bromination. Mechanistically, the domino process is proposed to involve palladium(II) species as key intermediates. First synthetic applications of the products have been demonstrated. PMID:26139012

  12. Radiometric Determination of Platinum and Palladium Attrition from Automotive Catalysts

    Microsoft Academic Search

    Robert F. Hill; William J. Mayer

    1977-01-01

    Automotive exhaust gas catalysts contain platinum and palladium as the active material on an alumina substrate. The loss rate of the active material from the catalyst under vehicle operating conditions was determined with a radiometric method in which radioactive platinum and palladium were used as tracers. Experiments with a commercial catalyst made radioactive by irradiation in a nuclear reactor indicated

  13. Gold and aluminum wire bonding to palladium surface finishes

    Microsoft Academic Search

    Chonglun Fan; Joseph A. Abys; Alan Blair

    1999-01-01

    Palladium surface finishes are utilized on leadframes, printed wiring boards and automobile sensors. Their superior functional performance and the considerable environmental impact of plating lead-free finishes for packaging processes have been increasingly recognized by the electronic industry. Wire bondable and solderable palladium finishes meet military and industrial standards at no extra cost in the overall assembly processes when compared to

  14. Hydrogen Segregation in Crystalline Palladium and Effects on Mechanical Properties

    Microsoft Academic Search

    Hieu Pham; Amine Benzerga; Tahir Cagin

    2011-01-01

    Calculations of tensile strength and tensile modulus were carried out to investigate the effects of hydrogen interactions, diffusion and segregations in palladium single crystal, high-vacancy crystal and bicrystal, by using the embedded atom method. Elevated temperature, hydrogen absorption and defects such as vacancy and grain boundary (GB) individually induce a loss in mechanical strength of palladium in a monotonous manner.

  15. New supported palladium-chromium catalysts: characterization and catalytic properties

    SciTech Connect

    Borgna, A.; Moraweck, B.; Massardier, J.; Renouprez, A.J. (Institut de Recherches sur la Catalyse, Villeurbanne (France))

    1991-03-01

    New silica-supported Pd-Cr catalysts have been prepared either by using mixed inorganic salts of the two metals as precursors or through the deposition of Cr(CO){sub 6} on a monometallic palladium catalyst. Analytic electron microscopy shows that palladium-enriched particles are formed. The EXAFS experiments show that when the reduction temperature reaches 870 K, part of the chromium is reduced and interacts with palladium. In the partial hydrogenation of 1,3-butadiene, these catalysts are less active but 100% selective for the formation of butenes. The explanation, proposed on the basis of hydrogen chemisorption and confirmed by XPS data, is a modification of the electronic structure of palladium, leading to a variation of the adsorption coefficients of the diene and alkenes, compared to the values measured on monometallic palladium catalysts.

  16. 1052 [Auk, Vol. 118Short Communications The Auk 118(4):10521057, 2001

    E-print Network

    Dearborn, Don

    1052 [Auk, Vol. 118Short Communications The Auk 118(4):1052­1057, 2001 Do Golden-cheeked Warblers species with limited breeding habitat. We examined nest-patch vegetation of the Golden- cheeked Warbler (Dendroica chrysoparia), a federally endangered migratory songbird. Golden-cheeked Warblers breed in short

  17. The application of infrared spectroscopy to probe the surface morphology of alumina-supported palladium catalysts

    Microsoft Academic Search

    Timothy Lear; Robert Marshall; J. Antonio Lopez-Sanchez; S. David Jackson; Thomas M. Klapötke; Marcus Bäumer; Günther Rupprechter; Hans-Joachim Freund; David Lennon

    2005-01-01

    Five alumina-supported palladium catalysts have been prepared from a range of precursor compounds [palladium(II) nitrate, palladium(II) chloride, palladium(II) acetylacetonate, and tetraamminepalladium(II) tetraazidopalladate(II)] and at different metal loadings (1-7.3 wt %). Collectively, this series of catalysts provides a range of metal particle sizes (1.2-8.5 nm) that emphasize different morphological aspects of the palladium crystallites. The infrared spectra of chemisorbed CO applied

  18. Palladium-assisted "aromatic metamorphosis" of dibenzothiophenes into triphenylenes.

    PubMed

    Vasu, Dhananjayan; Yorimitsu, Hideki; Osuka, Atsuhiro

    2015-06-01

    Two new palladium-catalyzed reactions of aromatic sulfur compounds enabled the conversion of dibenzothiophenes into triphenylenes in four steps. This transformation of one aromatic framework into another consists of 1)?4-chlorobutylation of the dibenzothiophene to form the corresponding sulfonium salt, 2)?palladium-catalyzed arylative ring opening of the sulfonium salt with a sodium tetraarylborate, 3)?an intramolecular SN 2 reaction to form a teraryl sulfonium salt, and 4)?palladium-catalyzed intramolecular C?S/C?H coupling through electrophilic palladation. Symmetrical as well as unsymmetrical triphenylenes of interest were synthesized in a tailor-made fashion in satisfactory overall yields. PMID:25939804

  19. Cross Section Limits for the $^{208}$Pb($^{86}$Kr,n)$^{293}$118 Reaction

    E-print Network

    K. E. Gregorich; T. N. Ginter; W. Loveland; D. Peterson; J. B. Patin; C. M. Folden III; D. C. Hoffman; D. M. Lee; H. Nitsche; J. P. Omtvedt; L. A. Omtvedt; L. Stavsetra; R. Sudowe; P. A. Wilk; P. M. Zielinski; K. Aleklett

    2002-09-04

    In April-May, 2001, the previously reported experiment to synthesize element 118 using the $^{208}$Pb($^{86}$Kr,n)$^{293}$118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 x 10$^{18}$ ions. The simple upper limit cross sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of 2.00 $T m$ and 2.12 $T m$, respectively. A more detailed cross section calculation, accounting for an assumed narrow excitation function, the energy loss of the beam in traversing the target and the uncertainty in the magnetic rigidity of the Z=118 recoils is also presented. Re-analysis of the primary data files from the 1999 experiment showed the reported element 118 events are not in the original data. The current results put constraints on the production cross section for synthesis of very heavy nuclei in cold fusion reactions.

  20. 33 CFR 118.140 - Painting bridge piers.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Painting bridge piers. 118.140 Section...LIGHTING AND OTHER SIGNALS § 118.140 Painting bridge piers. The District Commander may require painting the sides of bridge channel...

  1. 33 CFR 118.140 - Painting bridge piers.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Painting bridge piers. 118.140 Section...LIGHTING AND OTHER SIGNALS § 118.140 Painting bridge piers. The District Commander may require painting the sides of bridge channel...

  2. 33 CFR 118.140 - Painting bridge piers.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Painting bridge piers. 118.140 Section...LIGHTING AND OTHER SIGNALS § 118.140 Painting bridge piers. The District Commander may require painting the sides of bridge channel...

  3. 42 CFR 460.118 - Violation of rights.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Violation of rights. 460.118 Section 460...SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PROGRAMS...ELDERLY (PACE) Participant Rights § 460.118 Violation of rights. The PACE...

  4. 42 CFR 460.118 - Violation of rights.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Violation of rights. 460.118 Section 460...SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PROGRAMS...ELDERLY (PACE) Participant Rights § 460.118 Violation of rights. The PACE...

  5. 42 CFR 460.118 - Violation of rights.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Violation of rights. 460.118 Section 460...SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PROGRAMS...ELDERLY (PACE) Participant Rights § 460.118 Violation of rights. The PACE...

  6. 42 CFR 460.118 - Violation of rights.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Violation of rights. 460.118 Section 460...SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PROGRAMS...ELDERLY (PACE) Participant Rights § 460.118 Violation of rights. The PACE...

  7. 42 CFR 460.118 - Violation of rights.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Violation of rights. 460.118 Section 460...SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) PROGRAMS...ELDERLY (PACE) Participant Rights § 460.118 Violation of rights. The PACE...

  8. The palladium-catalyzed synthesis of organic amines

    E-print Network

    Harris, Michele C., 1975-

    2002-01-01

    Chapter 1. The chelating ligand bis[2-(diphenylphosphino)phenyl] ether (DPEphos), in combination with palladium acetate, forms a highly active catalyst system for the coupling of anilines with aryl bromides. The bisphosphine ...

  9. Crud formation by palladium particles as insoluble residues

    SciTech Connect

    Munakata, K.; Sugai, H. (Sumitomo Metal Mining Co., Ltd., Tokai Research Center, 2600, Ishigamitojuku, Takai-Mura, Ibaraki-ken 319-11 (JP)); Miyachi, S.; Yasu, S. (Power Reactor and Nuclear Fuel Development Corp., Tokai Works Reprocessing Plant, Analysis Section 4-33, Muramatu, Tokai-mura, Ibaraki-ken 319-11 (JP))

    1992-05-01

    This paper reports on crud which is a problem in the solvent extraction process for nuclear fuel reprocessing. Crud is an emulsion stabilized by dispersed fine solids. Insoluble residues and precipitates play an important role in crud formation. The effect of insoluble residues on crud formation is studied using submicron particles of palladium, which is one of the elements contained in insoluble residues. Experiments are conducted on factors such as palladium concentration, particle size, and acidity. The experimental results indicate that the smallest palladium concentration in the aqueous phase that can stabilize an emulsion is {approximately}g/l and that such an emulsion is of the oil-in-water type. Moreover, the palladium layer on globules is discussed, and a numerical estimation is performed to predict the time when stable emulsions start to form in a mixer-settler.

  10. Palladium-based electrocatalysts and fuel cells employing such electrocatalysts

    DOEpatents

    Masel; Richard I. (Champaign, IL), Zhu; Yimin (Urbana, IL), Larsen; Robert T. (Champaign, IL)

    2010-08-31

    A direct organic fuel cell includes a fluid fuel comprising formic acid, an anode having an electrocatalyst comprising palladium nanoparticles, a fluid oxidant, a cathode electrically connected to the anode, and an electrolyte interposed between the anode and the cathode.

  11. The electronic structure of palladium-uranium alloys

    Microsoft Academic Search

    J. A. Catterail

    1957-01-01

    The measured effects of uranium upon the paramagnetic susceptibility, electrical resistivity, thermoelectric power, and lattice parameter of palladium are discussed, and an interpretation of the results in terms of a solvent and solute band is suggested.

  12. Palladium-catalyzed regioselective domino cyclization of cyclohexadienones.

    PubMed

    Murthy, Akondi Srirama; Donikela, Sangeetha; Reddy, Cirandur Suresh; Chegondi, Rambabu

    2015-06-01

    A mild and efficient Pd-catalyzed arylative domino carbocyclization of cyclohexadienone-containing 1,6-enynes is described. The reaction tolerates a variety of functionalized boronic acids to afford a cis-fused bicyclic framework containing an ?,?-unsaturated ketone with excellent regio- and diastereoselectivity in good yields. The tandem process proceeds with ?-arylation of propargylic ether followed by conjugate addition of a vinyl palladium intermediate and subsequent protonolysis of a palladium enolate. PMID:25938739

  13. PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium)

    E-print Network

    126 PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium) (Data 7,750 7,210 7,820 9,600 10,000 Ruthenium 2,740 4,490 9,880 7,520 20,000 Iridium 207 896 926 1,450 2 for disposal Jan.-Sept. 96 Platinum 14,100 -- 311 -- Palladium 39,300 -- 467 -- Iridium 920

  14. Synthesis and characterization of nitrides of iridium and palladiums

    SciTech Connect

    Crowhurst, Jonathan C.; Goncharov, Alexander F.; Sadigh, B.; Zaug, J.M.; Aberg, D.; Meng, Yue; Prakapenka, Vitali B. (LLNL); (CIW); (UC)

    2008-08-14

    We describe the synthesis of nitrides of iridium and palladium using the laser-heated diamond anvil cell. We have used the in situ techniques of x-ray powder diffraction and Raman scattering to characterize these compounds and have compared our experimental findings where possible to the results of first-principles theoretical calculations. We suggest that palladium nitride is isostructural with pyrite, while iridium nitride has a monoclinic symmetry and is isostructural with baddeleyite.

  15. Preparation of supported palladium membrane and separation of hydrogen

    Microsoft Academic Search

    Kanna Aoki; Shuichi Yokoyama; Katsuki Kusakabe; Shigeharu Morooka

    1996-01-01

    Palladium acetate was sublimed at a reduced pressure at 400°C., carried into the macropores of the porous wall of an ?-alumina\\u000a support tube and was decomposed there. A thin palladium membrane which was thus formed showed a hydrogen permeance of 106 mol·m2·s1.-Pa1 and a hydrogen\\/nitrogen permselectivity higher than 1000. The membrane was stable against hydrogen embrittlement even when\\u000a the permeation

  16. The Magnetic Susceptibilities of Palladium-Uranium Alloys

    Microsoft Academic Search

    L. F. Bates; S. J. Leach

    1956-01-01

    Measurements are made of the paramagnetic susceptibilities of palladium-uranium alloys covering the range of solid solution, of an intermetallic compound Pd3U and of specimens of very pure palladium and uranium over the temperature range 77° to 293°K. Increasing amounts of uranium cause a rapid decrease of susceptibility up to a concentration of 9 atomic per cent. Further increase in the

  17. 46 CFR 118.310 - Fire main and hydrants.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Shipping 4 2010-10-01 2010-10-01 false Fire main and hydrants. 118.310 Section 118.310...OVERNIGHT ACCOMMODATIONS FOR MORE THAN 49 PASSENGERS FIRE PROTECTION EQUIPMENT Fire Main System § 118.310 Fire main and...

  18. 46 CFR 118.310 - Fire main and hydrants.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Shipping 4 2011-10-01 2011-10-01 false Fire main and hydrants. 118.310 Section 118.310...OVERNIGHT ACCOMMODATIONS FOR MORE THAN 49 PASSENGERS FIRE PROTECTION EQUIPMENT Fire Main System § 118.310 Fire main and...

  19. 46 CFR 118.320 - Fire hoses and nozzles.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Shipping 4 2010-10-01 2010-10-01 false Fire hoses and nozzles. 118.320 Section 118.320...OVERNIGHT ACCOMMODATIONS FOR MORE THAN 49 PASSENGERS FIRE PROTECTION EQUIPMENT Fire Main System § 118.320 Fire hoses and...

  20. 46 CFR 118.320 - Fire hoses and nozzles.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Shipping 4 2011-10-01 2011-10-01 false Fire hoses and nozzles. 118.320 Section 118.320...OVERNIGHT ACCOMMODATIONS FOR MORE THAN 49 PASSENGERS FIRE PROTECTION EQUIPMENT Fire Main System § 118.320 Fire hoses and...

  1. 32 CFR 552.118 - Issuance from unit arms room.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2009-07-01 true Issuance from unit arms room. 552.118 Section 552.118...MILITARY RESERVATIONS Physical Security of Arms, Ammunition, and Explosives-Fort Lewis...Washington § 552.118 Issuance from unit arms room. When privately owned weapons...

  2. 32 CFR 552.118 - Issuance from unit arms room.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false Issuance from unit arms room. 552.118 Section 552.118...MILITARY RESERVATIONS Physical Security of Arms, Ammunition, and Explosives-Fort Lewis...Washington § 552.118 Issuance from unit arms room. When privately owned weapons...

  3. 32 CFR 552.118 - Issuance from unit arms room.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2009-07-01 true Issuance from unit arms room. 552.118 Section 552.118...MILITARY RESERVATIONS Physical Security of Arms, Ammunition, and Explosives-Fort Lewis...Washington § 552.118 Issuance from unit arms room. When privately owned weapons...

  4. 32 CFR 552.118 - Issuance from unit arms room.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Issuance from unit arms room. 552.118 Section 552.118...MILITARY RESERVATIONS Physical Security of Arms, Ammunition, and Explosives-Fort Lewis...Washington § 552.118 Issuance from unit arms room. When privately owned weapons...

  5. 49 CFR 571.118 - Standard No. 118; Power-operated window, partition, and roof panel systems.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Standard No. 118; Power-operated window, partition, and roof panel systems... Standard No. 118; Power-operated window, partition, and roof panel systems...specifies requirements for power operated window, partition, and roof panel...

  6. 49 CFR 571.118 - Standard No. 118; Power-operated window, partition, and roof panel systems.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Standard No. 118; Power-operated window, partition, and roof panel systems... Standard No. 118; Power-operated window, partition, and roof panel systems...specifies requirements for power operated window, partition, and roof panel...

  7. 49 CFR 571.118 - Standard No. 118; Power-operated window, partition, and roof panel systems.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... Standard No. 118; Power-operated window, partition, and roof panel systems... Standard No. 118; Power-operated window, partition, and roof panel systems...specifies requirements for power operated window, partition, and roof panel...

  8. 49 CFR 571.118 - Standard No. 118; Power-operated window, partition, and roof panel systems.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... Standard No. 118; Power-operated window, partition, and roof panel systems... Standard No. 118; Power-operated window, partition, and roof panel systems...specifies requirements for power operated window, partition, and roof panel...

  9. 49 CFR 571.118 - Standard No. 118; Power-operated window, partition, and roof panel systems.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... Standard No. 118; Power-operated window, partition, and roof panel systems... Standard No. 118; Power-operated window, partition, and roof panel systems...specifies requirements for power operated window, partition, and roof panel...

  10. Electronic Transitions of Palladium and Vanadium Dimer

    NASA Astrophysics Data System (ADS)

    Qian, Yue; Ng, Y. W.; Cheung, A. S.-C.

    2013-06-01

    The laser induced fluorescence (LIF) spectrum of palladium dimer (Pd_{2}) in the visible region between 480 and 700 nm has been studied. Five vibrational bands were recorded and analyzed; they are assigned to a ^{3} ? _{g} - X^{3} ? _{u} ^{+} system. The vibrational frequency of the ground X^{3} ? _{u} ^{+} state has been determined to be 211.4 cm^{-1}. This is the first experimental observation of the LIF spectrum of Pd_{2}. In addition, the LIF spectrum of vanadium dimer (V_{2}) has also been studied; several new transition band systems were observed in the wavelength between 480 and 530 nm. The analysis of the spectra recorded for these two molecules will be presented.

  11. Electrochemical Synthesis and Characterization of Palladium Nanostructures

    NASA Astrophysics Data System (ADS)

    Ilias, S. H.; Kok, K. Y.; Ng, I. K.; Saidin, N. U.

    2013-04-01

    Palladium (Pd) is a good candidate material for hydrogen gas sensing at room temperature due to its high affinity to hydrogen. Pd in the form of nanostructures has demonstrated better performance in its gas sensing property as compared to that in the form of bulk metal because of its large surface area to volume ratio. In this work, various Pd nanostructures were synthesized via electrochemical route. Pd in the form of nanowires can be produced directly via template-assisted electrodeposition while Pd nanotubes were synthesized by galvanic displacement with morphology and composition governed by electrolyte temperature and reaction time. Using similar electrodeposition conditions, Pd in the form of nanoparticles were electrochemically decorated on the surfaces of ZnO rods and Si nanowires arrays. Growth study on various Pd nanostructures produced is presented here, using microscopy, diffraction and probe-based techniques for microstructural, morphological and chemical characterizations.

  12. Facile synthesis of porous tubular palladium nanostructures and their application in a nonenzymatic glucose sensor.

    PubMed

    Bai, Hongyan; Han, Min; Du, Yuezhi; Bao, Jianchun; Dai, Zhihui

    2010-03-14

    Porous tubular palladium nanostructures were synthesized by electrodeposition of palladium into a CdS modified alumina template and subsequent removal of CdS; the nanostructures provided a promising platform for the fabrication of nonenzymatic glucose sensors. PMID:20177634

  13. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.004 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.004 Journal of Research of the National Published: January 14, 2013 http://dx.doi.org/10.6028/jres.118.004 1. Introduction Singly ionized indium spectra, is induced by the #12;Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.004 Journal

  14. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.002 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.002 Journal of Research of the National: January 14, 2013 http://dx.doi.org/10.6028/jres.118.002 1. Introduction Several previous papers from our microspheres which contain green #12;Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.002 Journal

  15. Atomic-scale studies on the growth of palladium and titanium on GaN(0001)

    E-print Network

    Castell, Martin

    Atomic-scale studies on the growth of palladium and titanium on GaN(0001) C. No¨renberg a,b,*, M nitride; Palladium; Titanium; Alloys; Epitaxy; Metal­semiconductor interfaces; Nanostructures; Scanning;Here, we have focused on atomic-scale studies of the ini- tial growth stages of palladium and titanium

  16. Rational Design of a Chiral Palladium(0) Olefin Complex of Unprecedented Stability

    E-print Network

    Trauner, Dirk

    design and synthesis of a chiral diene ligand, which forms a palladium(0) complex of unprecedentedRational Design of a Chiral Palladium(0) Olefin Complex of Unprecedented Stability Marc A. Grundl. Olefin complexes of palladium(0) such as Pd2(dba)3 (dba ) dibenzylideneacetone)1 have been widely used

  17. Thermosonic gold wire bonding to laminate substrates with palladium surface finishes

    Microsoft Academic Search

    R. Wayne Johnson; Michael J. Palmer; Michael J. Bozack; Tamara Isaacs-Smith

    1999-01-01

    As the laminate substrate industry moves from hot air solder level (HASL) finishes, alternate plating finishes are being proposed such as immersion gold\\/electroless nickel, electroless palladium, and electroless silver. This paper presents results of an evaluation of the thermosonic gold ball wire bondability of electroless palladium. Two palladium thicknesses, with and without a nickel underlayer, were evaluated from two vendors.

  18. Chemical promotional effect of gold added to palladium supported on cerium oxide in catalytic methanol decomposition

    Microsoft Academic Search

    Mahendra P Kapoor; Yuichi Ichihashi; Toshie Nakamori; Yasuyuki Matsumura

    2004-01-01

    Addition of gold to palladium by simultaneous deposition–precipitation on cerium oxide increases the catalytic activity for methanol decomposition to carbon monoxide and hydrogen at 180°C. No significant promotional effect was observed by addition of rhodium or iridium to palladium. The electronic state or dispersion of palladium is unchanged by the addition of gold, suggesting presence of new active sites. Bimetallic

  19. Recovery of Elemental Palladium by Shewanella putrefaciens

    NASA Astrophysics Data System (ADS)

    Akasaka, S.; Xia, X.; Sawada, K.; Enokida, Y.; Yamamoto, I.; Ohnuki, T.

    2006-12-01

    Microbial reduction of metals plays an important role in environmental behavior and provides a technique for the recovery of metals from industrial wastewater. Recently, demand for platinum group metals (PGMs) increases by their catalytic properties. The extreme rarity of PGMs have led to a growing interest in their recovery. Palladium, one of PGMs, has different oxidation states of Pd(II) and Pd(0). The oxidized form of Pd(II) is soluble, while the reduced form of Pd(0) is insoluble. In this study, microbial reduction of palladium by Fe(III)- reducing bacterium, Shewanella putrefaceins was conducted. This bacterium is known to be capable of reducing metals, such as Mn(IV), U(VI), or Tc(VII) with organic C or H2 as an electron donor. In order to investigate the potential of S. putrefaciens to reduce Pd(II) in solution, resting cells or heat-killed cells were suspended under anaerobic conditions with lactate or H2 as an electron donor. The cells of S. putrefaciens (NBRC3908) were grown in aerobic medium, harvested by centrifugation, and then washed with 25 mmol/dm3 HEPES and 100 mmol/dm3 NaCl (HEPES-NaCl) solution (pH 7.0). The heat-killed cells were autoclaved for 20 min at 121 degrees C. The cell suspension (21.5 mg in dry weight) was resuspended in the HEPES-NaCl solution which contained 1.0 mmol/dm3 Na2PdCl4 (Wako Pure chemical Industries, Ltd). The suspensions were bubbled with N2 for 15 min before 10 mmol/dm3 lactate or 4.8 v/v% H2 was added. The suspensions were then incubated at 30 degrees C. Redox potential (Eh) and pH of the solutions were measured in an inert glove box with Ar gas. Concentration of Pd(II) was measured by Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-AES). Deposited Pd and cells were analyzed by X-ray powder diffraction (XRD) and Scanning Electron Microscope (SEM) with Energy-Dispersive Spectroscopy (EDS). Approximately 86% of Pd(II) of the initial concentration was removed from solution by the resting cells within 24 h when lactate was used as an electron donor. A black precipitates were observed in the solution, that was confirmed as Pd(0) by XRD analysis. SEM and EDS analyses identified that Pd bearing precipitates were present on and/or in the cells. The size of the precipitates associated with cells was approximately 100 nm in diameter. Approximately 23% of Pd(II) was removed by the heat-killed cells within 24 h. The precipitates between 200 and 300 nm in diameter were observed to be associated with the heat-killed cells by SEM and EDS analyses. No removal of Pd(II) was obtained without cells. On the contrary, complete removal of Pd(II) was occurred within 4 h after exposure of the resting cells to Pd(II) solution when H2 was used as an electron donor. Approximately 88 and 80% of Pd(II) was removed within 4 h with the heat-killed cells and without cells, respectively. The measured Eh and pH values were plotted in the Eh-pH diagram calculated for Pd-Cl-H2O system indicated that chemical conditions in the solutions were saturated with respect to Pd(0) at 24 or 4 h of incubation regardless the electron donor. These findings indicate that S. putrefaciens is capable to enhance the precipitation of palladium from solution by reducing Pd(II) to Pd(0) with lactate or H2 as an electron donor.

  20. Development and Bioorthogonal Activation of Palladium-Labile Prodrugs of Gemcitabine

    PubMed Central

    2014-01-01

    Bioorthogonal chemistry has become one of the main driving forces in current chemical biology, inspiring the search for novel biocompatible chemospecific reactions for the past decade. Alongside the well-established labeling strategies that originated the bioorthogonal paradigm, we have recently proposed the use of heterogeneous palladium chemistry and bioorthogonal Pd0-labile prodrugs to develop spatially targeted therapies. Herein, we report the generation of biologically inert precursors of cytotoxic gemcitabine by introducing Pd0-cleavable groups in positions that are mechanistically relevant for gemcitabine’s pharmacological activity. Cell viability studies in pancreatic cancer cells showed that carbamate functionalization of the 4-amino group of gemcitabine significantly reduced (>23-fold) the prodrugs’ cytotoxicity. The N-propargyloxycarbonyl (N-Poc) promoiety displayed the highest sensitivity to heterogeneous palladium catalysis under biocompatible conditions, with a reaction half-life of less than 6 h. Zebrafish studies with allyl, propargyl, and benzyl carbamate-protected rhodamines confirmed N-Poc as the most suitable masking group for implementing in vivo bioorthogonal organometallic chemistry. PMID:24867590

  1. Superconductivity and the structural phase transitions in palladium hydride and palladium deuteride

    SciTech Connect

    Standley, Robert Wendell

    1980-01-01

    The results of two experimental studies of the superconducting transition temperature, T/sub c/, of palladium hydride, PdH/sub x/, and palladium deuteride, PdD/sub x/, are presented. In the first study, the superconducting transition temperature of PdH/sub x/(D/sub x/) is studied as a function of H(D) concentration, x, in the temperature range from 0.2 K to 4K. The data join smoothly with those reported previously by Miller and Satterthwaite at higher temperatures, and the composite data are described by the empirical relation T/sub c/ = 150.8 (x-x/sub o/)/sup 2/ /sup 244/, where x/sub o/ = 0.715 for hydride samples and 0.668 for deuteride samples. The results, when compared with the theoretical predictions of Klein and Papaconstantopoulos, et al., raise questions about the validity of their explanation of the reverse isotope effect, which is based solely on a difference in force constants. In the second study, the effect of the order-disorder structural transition associated with the 50 K anomaly on the superconductivity of PdH/sub x/(D/sub x/) is investigated. Samples were quenched to low temperatures in the disordered state, and their transition temperatures measured. The samples were then annealed just below the anomaly temperature, and the ordering process followed by monitoring the change in sample resistance. The transition temperatures in the ordered state were then measured.

  2. Isothermal decomposition of gamma-irradiated palladium acetate

    NASA Astrophysics Data System (ADS)

    Mahfouz, R. M.; Alshehri, S. M.; Monshi, M. A. S.; Abd El-Salam, N. M.

    2004-06-01

    The isothermal decomposition of un-irradiated (pristine) and pre-gamma-irradiated palladium acetate was studied in the temperature range (498-508 K) and in air using the isothermal thermogravimetric technique. The data were analysed using various solid state reaction models. The results showed that the kinetics of isothermal decomposition of palladium acetate was governed by random nucleation reaction (Erofe'ev equation A(3)). The activation energies of the main decomposition process for un-irradiated and pre-gamma-irradiated samples were calculated. The change in texture and crystal structure of the investigated palladium acetate by gamma-irradiation was studied using electron microscopy and X-ray diffraction techniques.

  3. Superlattices of platinum and palladium nanoparticles

    SciTech Connect

    MARTIN,JAMES E.; WILCOXON,JESS P.; ODINEK,JUDY G.; PROVENCIO,PAULA P.

    2000-04-06

    The authors have used a nonionic inverse micelle synthesis technique to form nanoclusters of platinum and palladium. These nanoclusters can be rendered hydrophobic or hydrophilic by the appropriate choice of capping ligand. Unlike Au nanoclusters, Pt nanoclusters show great stability with thiol ligands in aqueous media. Alkane thiols, with alkane chains ranging from C{sub 6} to C{sub 18} were used as hydrophobic ligands, and with some of these they were able to form 2-D and/or 3-D superlattices of Pt nanoclusters as small as 2.7 nm in diameter. Image processing techniques were developed to reliably extract from transmission electron micrographs (TEMs) the particle size distribution, and information about the superlattice domains and their boundaries. The latter permits one to compute the intradomain vector pair correlation function of the particle centers, from which they can accurately determine the lattice spacing and the coherent domain size. From these data the gap between the particles in the coherent domains can be determined as a function of the thiol chain length. It is found that as the thiol chain length increases, the gaps between particles within superlattice domains increases, but more slowly than one might expect, possibly indicating thiol chain interdigitation.

  4. Glycerol hydrogenolysis promoted by supported palladium catalysts.

    PubMed

    Musolino, Maria Grazia; Scarpino, Luciano Antonio; Mauriello, Francesco; Pietropaolo, Rosario

    2011-08-22

    Catalytic hydrogenolysis, with high conversion and selectivity, promoted by supported palladium substrates in isopropanol and dioxane at a low H(2) pressure (0.5 MPa), is reported for the first time. The catalysts, characterized by using BET isotherms, transmission electron microscopy (TEM), temperature-programmed reduction (TPR), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), were obtained by coprecipitation and impregnation techniques. The coprecipitation method allows catalysts with a metal-metal or a metal-support interaction to be obtained, which enhances the catalytic performance for both the conversion of glycerol and the selectivity to 1,2-propanediol. Analogous reactions carried out with catalysts prepared by using impregnation are less efficient. A study of the solvent and temperature effect is also presented. The obtained results allow the hydrogenolysis mechanism to be inferred; this involves both the direct replacement of the carbon-bonded OH group by an incoming hydrogen or the formation of hydroxyacetone as an intermediate, which subsequently undergoes a hydrogenation process to give 1,2-propanediol. Finally, catalytic tests on a large-scale reaction at a higher H(2) pressure and recycling of the samples were carried out with the better performing catalysts (Pd/CoO and Pd/Fe(2)O(3) prepared by using coprecipitation) to verify possible industrial achievements. PMID:21714100

  5. Palladium exposure of barley: uptake and effects.

    PubMed

    Battke, F; Leopold, K; Maier, M; Schmidhalter, U; Schuster, M

    2008-03-01

    Motor vehicles are now equipped with exhaust gas catalytic converters containing rare metals, such as palladium (Pd), platinum and rhodium, as catalytic active materials, leading to significantly increased emission of these metals. Compared with platinum and rhodium, low concentrations of Pd have been shown to have more serious effects on cells and organisms. In the present study, uptake of Pd by barley and behaviour of Pd nanoparticles in nutrient solutions used to grow plants were observed in order to develop a model of Pd exposure of plant systems. Pd determination was performed using a selective separation and pre-concentration procedure, which was further developed for this study, and coupled to graphite furnace atomic absorption spectrometry. The results show that uptake of Pd depends on Pd particle diameter. Compared to other toxic metals, like mercury, Pd causes stress effects in leaves at lower concentrations in nutrient solutions. Furthermore, Pd particles are dissolved at different rates, depending on size, in the nutrient solution during plant growth. PMID:18304202

  6. Wet-chemical synthesis of palladium nanosprings.

    PubMed

    Liu, Lichun; Yoo, Sang-Hoon; Lee, Sang A; Park, Sungho

    2011-09-14

    We report a methodology for synthesis of palladium (Pd) nanospring structures using an anodic aluminum oxide (AAO) membrane template and facile electrochemical deposition. The hydroxyl-terminated surfaces of alumina nanochannels and localized hydrogen evolution contribute to the growth of Pd atoms at peripheral positions of the alumina nanochannels in the presence of an effectual electric potential and a plating solution consisting of PdCl(2), CuCl(2), and HCl. Structural characterization including EDS line analysis and element mapping revealed Pd nanodomains curling up on the Cu nanorods. A clear Pd nanospring shape was observed after selectively removing Cu. The lengths of the nanosprings were dictated by the charges transported through electrodeposition, and the diameters of the nanosprings were tunable by altering the diameter of the alumina nanochannels. Screw dislocation is the most probable crystallographic defect responsible for the formation of coiled Pd nanostructures. Pd nanosprings have potential applications in nanomachines, nanosensors, nanoinductors, and metamaterials. We anticipate that our synthesis method will motivate and inform the synthesis of more advanced nanomaterials. PMID:21819102

  7. Palladium-Catalyzed Arylation of Fluoroalkylamines.

    PubMed

    Brusoe, Andrew T; Hartwig, John F

    2015-07-01

    We report the synthesis of fluorinated anilines by palladium-catalyzed coupling of fluoroalkylamines with aryl bromides and aryl chlorides. The products of these reactions are valuable because anilines typically require the presence of an electron-withdrawing substituent on nitrogen to suppress aerobic or metabolic oxidation, and the fluoroalkyl groups have steric properties and polarity distinct from those of more common electron-withdrawing amide and sulfonamide units. The fluoroalkylaniline products are unstable under typical conditions for C-N coupling reactions (heat and strong base). However, the reactions conducted with the weaker base KOPh, which has rarely been used in cross-coupling to form C-N bonds, occurred in high yield in the presence of a catalyst derived from commercially available AdBippyPhos and [Pd(allyl)Cl]2. Under these conditions, the reactions occur with low catalyst loadings (<0.50 mol % for most substrates) and tolerate the presence of various functional groups that react with the strong bases that are typically used in Pd-catalyzed C-N cross-coupling reactions of aryl halides. The resting state of the catalyst is the phenoxide complex, (BippyPhosPd(Ar)OPh); due to the electron-withdrawing property of the fluoroalkyl substituent, the turnover-limiting step of the reaction is reductive elimination to form the C-N bond. PMID:26065341

  8. Reaction between palladium(II) and gallium(III) halogenides in arenes: influence of halogen nature on the formation of binuclear palladium(I) clusters

    Microsoft Academic Search

    Mikhail Gorlov; Andreas Fischer; Lars Kloo

    2004-01-01

    Palladium(II) bromide reacts with gallium(III) bromide in the presence of arenes yielding binuclear palladium(I) complexes [Pd2(GaBr4)2(arene)2], where arene=benzene (1), toluene (2) and p-xylene (3). Reaction of palladium(II) chloride with gallium(III) chloride in p-xylene leads to the analogous palladium(I) compound [Pd2(GaCl4)2(p-xylene)2] (4); the X-ray structures of 1–4 were determined.

  9. Palladium and platinum-palladium bi-layer based counter electrode for dye-sensitized solar cells with modified photoanode

    NASA Astrophysics Data System (ADS)

    Mokurala, Krishnaiah; Kamble, Anvita; Nemala, Siva Sankar; Bhargava, Parag; Mallick, Sudhanshu

    2015-06-01

    Dye sensitized solar cells (DSSCs) were fabricated with palladium (Pd) and platinum-palladium (Pt-Pd) bi-layer as counter electrodes, respectively. Effects of photoanode thickness and morphology on device performance were studied. DSSCs fabricated with Pd and Pd-Pt as counter electrode (CE) showed photo conversion efficiency of 4.30% and 6.20%, respectively as compared to Platinum (Pt) based CE which showed 6.65% efficiency. Lower device performance was explained with help of cyclic voltammetry and electrochemical impedance spectroscopy (EIS) measurements of the cells.

  10. 118-B-1 excavation treatability test procedures

    SciTech Connect

    Frain, J.M.

    1994-08-01

    This treatability study has two purposes: to support development of the approach to be used for burial ground remediation, and to provide specific engineering information for the design of burial grounds receiving waste generated from the 100 Area removal actions. Data generated from this test will also provide performance and cost information necessary for detailed analysis of alternatives for burial ground remediation. Further details on the test requirements, milestones and data quality objectives are described in detail in the 118-B-1 Excavation Treatability Test Plan (DOE/RL-94-43). These working procedures are intended for use by field personnel to implement the requirements of the milestone. A copy of the detailed Test Plan will be kept on file at the on-site field support trailer, and will be available for review by field personnel.

  11. 33 CFR 118.120 - Radar reflectors and racons.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Radar reflectors and racons. 118.120 Section...LIGHTING AND OTHER SIGNALS § 118.120 Radar reflectors and racons. The District...require or authorize the installation of radar reflectors and racons on bridge...

  12. 33 CFR 118.120 - Radar reflectors and racons.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Radar reflectors and racons. 118.120 Section...LIGHTING AND OTHER SIGNALS § 118.120 Radar reflectors and racons. The District...require or authorize the installation of radar reflectors and racons on bridge...

  13. 19 CFR 12.118 - Toxic Substances Control Act.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 2010-04-01 false Toxic Substances Control Act. 12.118 Section...of Mixtures and Articles § 12.118 Toxic Substances Control Act. The importation...substance or mixture, is governed by the Toxic Substances Control Act (“TSCA”)...

  14. 32 CFR 701.118 - Privacy, IT, and PIAs.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 2010-07-01 false Privacy, IT, and PIAs. 701.118 Section 701...Privacy Program § 701.118 Privacy, IT, and PIAs. (a) Development...considered when purchasing or creating new IT systems or when initiating new...

  15. 32 CFR 701.118 - Privacy, IT, and PIAs.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Privacy, IT, and PIAs. 701.118 Section 701...Privacy Program § 701.118 Privacy, IT, and PIAs. (a) Development...considered when purchasing or creating new IT systems or when initiating new...

  16. 40 CFR 51.118 - Stack height provisions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Stack height provisions. 51.118 Section 51... Control Strategy § 51.118 Stack height provisions. (a) The plan must...affected by so much of any source's stack height that exceeds good engineering...

  17. 40 CFR 51.118 - Stack height provisions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Stack height provisions. 51.118 Section 51... Control Strategy § 51.118 Stack height provisions. (a) The plan must...affected by so much of any source's stack height that exceeds good engineering...

  18. 40 CFR 51.118 - Stack height provisions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 2013-07-01 false Stack height provisions. 51.118 Section 51... Control Strategy § 51.118 Stack height provisions. (a) The plan must...affected by so much of any source's stack height that exceeds good engineering...

  19. 40 CFR 51.118 - Stack height provisions.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Stack height provisions. 51.118 Section 51... Control Strategy § 51.118 Stack height provisions. (a) The plan must...affected by so much of any source's stack height that exceeds good engineering...

  20. The ITEA-NASA STS-118 Design Challenges

    ERIC Educational Resources Information Center

    Meade, Shelli D.; Caron, Daniel W.; Gray, Aaron; Weaver, Kim

    2008-01-01

    In conjunction with the August 8, 2007 launch of STS-118, the International Technology Education Association (ITEA) and National Aeronautics and Space Administration (NASA) developed and recently debuted curricular units for Grades K-12 on Space Exploration, known as STS-118 Design Challenges. The units focus on aspects of the themes that NASA…

  1. Reduction of nitro compounds by carbon monoxide on palladium complexes

    SciTech Connect

    Min'kov A.I.; Eremenko, N.K.; Merkur'eva, S.E.; Efimov, O.A.

    1986-12-20

    Various types of nitro compounds may be reduced to the corresponding amines by carbon monoxide and water in the presence of palladium acetate and a tertiary aromatic phosphine. A catalytically active complex, (HPd/sub 2/(PPh/sub 3/)/sub 4/(CO)(HSO/sub 4/))/sub n/, was isolated.

  2. Asymmetric palladium-catalyzed hydroarylation of styrenes and dienes

    Microsoft Academic Search

    Susanne M. Podhajsky; Yasumasa Iwai; Amanda Cook-Sneathen; Matthew S. Sigman

    2011-01-01

    Alkenes are desirable and highly versatile starting materials for organic transformations, and well-known substrates for palladium catalysis. Typically, these reactions result in the formation of a new alkene product via ?-hydride elimination. In contrast to this scenario, our laboratory has been involved in the development of alkene hydro- and difunctionalization reactions, where ?-hydride elimination can be controlled. We report herein

  3. Palladium-catalyzed distannylation of ortho-quinodimethanes.

    PubMed

    Yoshida, Hiroto; Nakano, Saori; Yamaryo, Yasuhito; Ohshita, Joji; Kunai, Atsutaka

    2006-08-31

    An exo-diene moiety of various ortho-quinodimethanes, regardless of its transient character, was inserted into a Sn-Sn sigma-bond of hexabutyldistannane in the presence of a palladium catalyst, giving alpha,alpha'-bis(tributylstannyl)-o-xylenes straightforwardly. PMID:16928098

  4. Palladium-109 labeled anti-melanoma monoclonal antibodies

    DOEpatents

    Srivastava, S.C.; Fawwaz, R.A.; Ferrone, S.

    1984-04-30

    The invention consists of new monoclonal antibodies labelled with Palladium 109, a beta-emitting radionuclide, the method of preparing this material, and its use in the radiotherapy of melanoma. The antibodies are chelate-conjugated and demonstrate a high uptake in melanomas. (ACR)

  5. Discovery of palladium, antimony, tellurium, iodine, and xenon isotopes

    E-print Network

    Kathawa, J; Thoennessen, M

    2012-01-01

    Currently, thirty-eight palladium, thirty-eight antimony, thirty-nine tellurium, thirty-eight iodine, and forty xenon isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  6. Pd-Catalyzed Wacker Cyclizations Palladium-Catalyzed Oxidative Wacker

    E-print Network

    Stoltz, Brian M.

    Pd-Catalyzed Wacker Cyclizations Palladium-Catalyzed Oxidative Wacker Cyclizations in Nonpolar. Trend, Yeeman K. Ramtohul, Eric M. Ferreira, and Brian M. Stoltz* Catalytic asymmetric oxidation-electron oxidations that do not involve heteroatom transfer. Some potentially valuable reactions of this type include

  7. Palladium buffer-layered high performance ionic polymer metal composites

    Microsoft Academic Search

    Sang-Mun Kim; Kwang J. Kim

    2008-01-01

    A new IPMC fabrication method---that is not a repetitive reduction processes---and a new supporting electrode material that is responsible for this procedure are described in this paper. A palladium metal, acting as a buffer layer, was deposited before plating the platinum electrode in order to articulate the surface morphology and the interfacial effect between the electrode and the membrane. The

  8. Palladium buffer-layered high performance ionic polymer metal composites

    NASA Astrophysics Data System (ADS)

    Kim, Sang-Mun; Kim, Kwang J.

    2008-06-01

    A new IPMC fabrication method—that is not a repetitive reduction processes—and a new supporting electrode material that is responsible for this procedure are described in this paper. A palladium metal, acting as a buffer layer, was deposited before plating the platinum electrode in order to articulate the surface morphology and the interfacial effect between the electrode and the membrane. The platinum layer was sequentially grown using an electroless chemical deposition on a palladium buffer layer on the polymer membrane. The surface morphology and conductivity of the electrode were enhanced by depositing a buffer layer. Under the same applied voltage, when compared to IPMCs without a buffer layer, the IPMCs with a palladium buffer layer showed a greater bending tendency and had a higher blocking force. The results also indicated that such IPMCs do not exhibit the back relaxation phenomenon under a sustained DC voltage. The amplitude of the transduction signal produced by the Pt/Pd IPMC shows much larger amplitude of the signal produced by the Pt IPMC. Thus, the IPMC with a palladium buffer layer has the potential for future applications as an actuator and transducer.

  9. EXAFS Studies of Palladium Nanoparticles: Size Control and Hydrogenation

    E-print Network

    Frenkel, Anatoly

    #12;EXAFS Studies of Palladium Nanoparticles: Size Control and Hydrogenation T. Harris,1 L. Soussan was preserved, within the accuracy of the EXAFS measurement, after preparing Langmuir films. We also studied. Keywords: EXAFS, nanoparticles, hydrogenation. PACS: 61.10.Ht, 61.46.Df, 81.07.Nb INTRODUCTION Thiol

  10. PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium)

    E-print Network

    122 PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium) (Data platinum-iridium alloys in prosthetic and biomedical devices. Salient Statistics--United States: 1996 1997,400 16,600 Iridium 1,810 1,860 1,950 2,270 2,640 Osmium NA 54 71 23 46 Exports: Platinum 12,700 23,000 14

  11. Selective palladium-catalyzed hydroformylation of alkynes to ?,?-unsaturated aldehydes.

    PubMed

    Fang, Xianjie; Zhang, Min; Jackstell, Ralf; Beller, Matthias

    2013-04-22

    Atom-efficient: A selective palladium catalyst system is used for the hydroformylation of alkynes (see picture). In this syngas reaction, various alkynes were smoothly transformed to synthetically interesting ?,?-unsaturated aldehydes in good yields with high regio- and stereoselectivity. PMID:23520060

  12. Hydrogen storage properties of isocyanide-stabilized palladium nanoparticles.

    PubMed

    Horinouchi, Shintaro; Yamanoi, Yoshinori; Yonezawa, Tetsu; Mouri, Toshihiro; Nishihara, Hiroshi

    2006-02-14

    Monodispersed palladium nanoparticles protected with n-octyl isocyanide were prepared, and their hydrogen absorption behavior was evaluated. The formation of the nanoparticles has been confirmed by means of 1H NMR and elemental analysis. Fourier transform infrared (FT-IR) showed that three distinct bands (2156, 1964, and 1611 cm(-1)) assigned to mono-, double-, and triple-bridged isocyanide ligands on the palladium surface. The average diameter of the particles was estimated to be 2.1 +/- 0.7 nm from observation by transmission electron microscopy (TEM). X-ray photoelectron spectroscopy (XPS) analysis revealed that the particles contained Pd(0) with little amounts of Pd(II) or Pd(IV), in sharp contrast to the thiol- or phosphine-stabilized palladium nanoparticles. The absorption and desorption of hydrogen were reversible, and the reactions were much faster for the nanoparticles than for the bulk palladium metal, whereas the storage capacity was almost the same, 0.6 wt %. PMID:16460122

  13. Development of palladium composite membranes for hydrogen separation

    SciTech Connect

    Paglieri, S. N. (Stephen N.); Birdsell, S. A. (Stephen A.); Snow, R. C. (Ronny C.); Smith, F. M. (Frank M.); Tewell, C. R. (Craig R.)

    2004-01-01

    Two types of palladium composite membrane were investigated for hydrogen separation. A palladium alloy membrane was prepared by electroless plating a layer of palladium ({approx}20 {micro}m) and then copper onto a commercially available porous (nominal 0.2 {micro}m pores) {alpha}-alumina substrate. The resulting multilayer metal film was annealed at 355 C for several days to promote metallic interdiffusion and alloy formation. During the heat treatment, a maximum hydrogen flux of 0.15 mol (STP)/m{sup 2} {center_dot} s was observed at 355 C and a pressure drop ({Delta}P) across the membrane of 6.8 atm. The H{sub 2}/Ar ideal separation factor was 68 at these conditions, however, the separation factor decreased upon thermal cycling. The other type of membrane fabricated was a palladium coated vanadium-copper alloy foil where the main advantage is the reduction in palladium film coating thickness to 100 nm per side. New methods are being developed for welding the thin foil into modules for testing. The hydrogen flux through a pinhole-free, 75 {micro}m thick Pd/VCu{sub 1.1}/Pd (atomic %) composite membrane was 0.66 mol (STP)/m{sup 2} {center_dot} at 350 C and {Delta}P = 3.5 atm compared to 0.44 mol (STP)/m{sup 2} {center_dot} s for a 71 {micro}m thick Pd/VCu{sub 10}/Pd membrane. Vanadium alloy composition was checked using Auger electron spectroscopy (AES).

  14. 27 CFR 20.118 - Rubbing alcohol general-use formula.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... false Rubbing alcohol general-use formula. 20.118 Section 20.118 Alcohol...DISTRIBUTION AND USE OF DENATURED ALCOHOL AND RUM Formulas and Statements of Process General-Use Formulas § 20.118 Rubbing alcohol...

  15. 27 CFR 20.118 - Rubbing alcohol general-use formula.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... false Rubbing alcohol general-use formula. 20.118 Section 20.118 Alcohol...DISTRIBUTION AND USE OF DENATURED ALCOHOL AND RUM Formulas and Statements of Process General-Use Formulas § 20.118 Rubbing alcohol...

  16. 21 CFR 118.9 - Administration of the Salmonella Enteritidis (SE) prevention plan.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Administration of the Salmonella Enteritidis (SE) prevention plan. 118.9 Section 118...TRANSPORTATION OF SHELL EGGS § 118.9 Administration of the Salmonella Enteritidis (SE) prevention plan. You must...

  17. 21 CFR 118.9 - Administration of the Salmonella Enteritidis (SE) prevention plan.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Administration of the Salmonella Enteritidis (SE) prevention plan. 118.9 Section 118...TRANSPORTATION OF SHELL EGGS § 118.9 Administration of the Salmonella Enteritidis (SE) prevention plan. You must...

  18. 21 CFR 118.7 - Sampling methodology for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Sampling methodology for Salmonella Enteritidis (SE). 118.7 Section 118.7 Food and...TRANSPORTATION OF SHELL EGGS § 118.7 Sampling methodology for Salmonella Enteritidis (SE). (a) Environmental...

  19. 21 CFR 118.9 - Administration of the Salmonella Enteritidis (SE) prevention plan.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Administration of the Salmonella Enteritidis (SE) prevention plan. 118.9 Section 118...TRANSPORTATION OF SHELL EGGS § 118.9 Administration of the Salmonella Enteritidis (SE) prevention plan. You must...

  20. 21 CFR 118.7 - Sampling methodology for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 2012-04-01 false Sampling methodology for Salmonella Enteritidis (SE). 118.7 Section 118.7 Food and...TRANSPORTATION OF SHELL EGGS § 118.7 Sampling methodology for Salmonella Enteritidis (SE). (a) Environmental...

  1. 21 CFR 118.7 - Sampling methodology for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Sampling methodology for Salmonella Enteritidis (SE). 118.7 Section 118.7 Food and...TRANSPORTATION OF SHELL EGGS § 118.7 Sampling methodology for Salmonella Enteritidis (SE). (a) Environmental...

  2. 16 CFR 1028.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...definite plans for involvement of human subjects. 1028.118 Section 1028.118...COMMISSION GENERAL PROTECTION OF HUMAN SUBJECTS § 1028.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  3. 38 CFR 16.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...definite plans for involvement of human subjects. 16.118 Section 16.118 Pensions...VETERANS AFFAIRS PROTECTION OF HUMAN SUBJECTS § 16.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  4. 22 CFR 225.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...definite plans for involvement of human subjects. 225.118 Section 225.118 Foreign...INTERNATIONAL DEVELOPMENT PROTECTION OF HUMAN SUBJECTS § 225.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  5. 10 CFR 745.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...definite plans for involvement of human subjects. 745.118 Section 745.118 Energy...DEPARTMENT OF ENERGY PROTECTION OF HUMAN SUBJECTS § 745.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  6. 38 CFR 16.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...definite plans for involvement of human subjects. 16.118 Section 16.118 Pensions...VETERANS AFFAIRS PROTECTION OF HUMAN SUBJECTS § 16.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  7. 28 CFR 46.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...definite plans for involvement of human subjects. 46.118 Section 46.118 Judicial...JUSTICE (CONTINUED) PROTECTION OF HUMAN SUBJECTS § 46.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  8. 49 CFR 11.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...definite plans for involvement of human subjects. 11.118 Section 11.118 Transportation...Transportation PROTECTION OF HUMAN SUBJECTS § 11.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  9. 16 CFR 1028.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...definite plans for involvement of human subjects. 1028.118 Section 1028.118...COMMISSION GENERAL PROTECTION OF HUMAN SUBJECTS § 1028.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  10. 28 CFR 46.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...definite plans for involvement of human subjects. 46.118 Section 46.118 Judicial...JUSTICE (CONTINUED) PROTECTION OF HUMAN SUBJECTS § 46.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  11. 7 CFR 1c.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...definite plans for involvement of human subjects. 1c.118 Section 1c.118 Agriculture...of Agriculture PROTECTION OF HUMAN SUBJECTS § 1c.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  12. 32 CFR 219.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...definite plans for involvement of human subjects. 219.118 Section 219.118 National... MISCELLANEOUS PROTECTION OF HUMAN SUBJECTS § 219.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  13. 49 CFR 11.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...definite plans for involvement of human subjects. 11.118 Section 11.118 Transportation...Transportation PROTECTION OF HUMAN SUBJECTS § 11.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  14. 14 CFR 1230.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...definite plans for involvement of human subjects. 1230.118 Section 1230.118...ADMINISTRATION PROTECTION OF HUMAN SUBJECTS § 1230.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  15. 22 CFR 225.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...definite plans for involvement of human subjects. 225.118 Section 225.118 Foreign...INTERNATIONAL DEVELOPMENT PROTECTION OF HUMAN SUBJECTS § 225.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  16. 10 CFR 745.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...definite plans for involvement of human subjects. 745.118 Section 745.118 Energy...DEPARTMENT OF ENERGY PROTECTION OF HUMAN SUBJECTS § 745.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  17. 38 CFR 16.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...definite plans for involvement of human subjects. 16.118 Section 16.118 Pensions...VETERANS AFFAIRS PROTECTION OF HUMAN SUBJECTS § 16.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  18. 28 CFR 46.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...definite plans for involvement of human subjects. 46.118 Section 46.118 Judicial...JUSTICE (CONTINUED) PROTECTION OF HUMAN SUBJECTS § 46.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  19. 32 CFR 219.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...definite plans for involvement of human subjects. 219.118 Section 219.118 National... MISCELLANEOUS PROTECTION OF HUMAN SUBJECTS § 219.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  20. 10 CFR 745.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...definite plans for involvement of human subjects. 745.118 Section 745.118 Energy...DEPARTMENT OF ENERGY PROTECTION OF HUMAN SUBJECTS § 745.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  1. 7 CFR 1c.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...definite plans for involvement of human subjects. 1c.118 Section 1c.118 Agriculture...of Agriculture PROTECTION OF HUMAN SUBJECTS § 1c.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  2. 14 CFR 1230.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...definite plans for involvement of human subjects. 1230.118 Section 1230.118...ADMINISTRATION PROTECTION OF HUMAN SUBJECTS § 1230.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  3. 16 CFR 1028.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...definite plans for involvement of human subjects. 1028.118 Section 1028.118...COMMISSION GENERAL PROTECTION OF HUMAN SUBJECTS § 1028.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  4. 32 CFR 219.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...definite plans for involvement of human subjects. 219.118 Section 219.118 National... MISCELLANEOUS PROTECTION OF HUMAN SUBJECTS § 219.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  5. 22 CFR 225.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...definite plans for involvement of human subjects. 225.118 Section 225.118 Foreign...INTERNATIONAL DEVELOPMENT PROTECTION OF HUMAN SUBJECTS § 225.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  6. 7 CFR 1c.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...definite plans for involvement of human subjects. 1c.118 Section 1c.118 Agriculture...of Agriculture PROTECTION OF HUMAN SUBJECTS § 1c.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  7. 49 CFR 11.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...definite plans for involvement of human subjects. 11.118 Section 11.118 Transportation...Transportation PROTECTION OF HUMAN SUBJECTS § 11.118 Applications and proposals...definite plans for involvement of human subjects. Certain types of...

  8. 7 CFR 1c.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...lacking definite plans for involvement of human subjects. 1c.118 Section 1c.118...Secretary of Agriculture PROTECTION OF HUMAN SUBJECTS § 1c.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  9. 28 CFR 46.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...lacking definite plans for involvement of human subjects. 46.118 Section 46.118...OF JUSTICE (CONTINUED) PROTECTION OF HUMAN SUBJECTS § 46.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  10. 38 CFR 16.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...lacking definite plans for involvement of human subjects. 16.118 Section 16.118...DEPARTMENT OF VETERANS AFFAIRS PROTECTION OF HUMAN SUBJECTS § 16.118 Applications and...lacking definite plans for involvement of human subjects. Certain types...

  11. 49 CFR 11.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...lacking definite plans for involvement of human subjects. 11.118 Section 11.118...Secretary of Transportation PROTECTION OF HUMAN SUBJECTS § 11.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  12. 15 CFR 27.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...lacking definite plans for involvement of human subjects. 27.118 Section 27.118...the Secretary of Commerce PROTECTION OF HUMAN SUBJECTS § 27.118 Applications and...lacking definite plans for involvement of human subjects. Certain types...

  13. 21 CFR 118.1 - Persons covered by the requirements in this part.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 118.1 Section 118.1 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT...AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION PRODUCTION...in § 118.11. (b) If you transport or hold shell eggs for shell...

  14. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.014 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.014 Journal of Research of the National; source activity. Accepted: May 7, 2013 Published: May 28, 2013 http://dx.doi.org/10.6028/jres.118.014 1 of counts per second. #12;Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.014 Journal of Research

  15. Characterization of the {beta}-phase of the palladium-hydrogen equation of state

    SciTech Connect

    Fisher, K.J.

    1998-07-01

    The {beta}-phase of the P-C-T curves of the palladium-hydrogen system is encountered at high pressures of gaseous hydrogen and low temperatures of this system. The {beta}-phase is characterized by an increase in the concentration of hydrogen in the palladium lattice with an increase in pressure of the free hydrogen gas surrounding the palladium. The P-C-T curves in this study are determined by gravimetric measurements of the hydrided palladium sample to determine the amount of hydrogen within the palladium lattice. The amount of hydrogen is kept constant within the experimental system and the temperature is varied which changes the pressures. The objective of this experimental thesis is to accurately determine the P-C-T curves of palladium in the {beta}-phase region to pressures of 20,000 psia and medium to low temperature region of {minus}60 C to 100 C.

  16. Superparamagnetic nanoparticles-supported phosphine-free palladium catalyst for the Sonogashira coupling reaction

    Microsoft Academic Search

    Nam T. S. Phan; Ha V. Le

    2011-01-01

    Superparamagnetic nanoparticles were synthesized following a microemulsion method, and functionalized with Schiff-base groups on the surface to form immobilized bidentate ligands. The functionalized nanoparticles were complexed with palladium acetate, affording the immobilized palladium complex catalyst with a palladium loading of 0.24mmol\\/g. The catalyst was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample

  17. Separation of Hydrogen Using an Electroless Deposited Thin-Film Palladium-Ceramic Composite Membrane

    SciTech Connect

    Ilias, S.; King, F.G.; Fan, Ting-Fang; Roy, S. [North Carolina Agricultural and Technical State Univ., Greensboro, NC (United States). Dept. of Chemical Engineering

    1996-12-31

    The primary objective of this project was to prepare and characterize a hydrogen permselective palladium-ceramic composite membrane for high temperature gas separations and catalytic membrane reactors. Electroless plating method was used to deposit a thin palladium film on microporous ceramic substrate. The objective of this paper is to discuss the preparation and characterization of a thin-film palladium-ceramic composite membrane for selective separation of hydrogen at elevated temperatures and pressures. In this paper, we also present a model to describe the hydrogen transport through the palladium-ceramic composite membrane in a cocurrent flow configuration.

  18. First-principles study of hydrogen diffusion in transition metal palladium

    NASA Astrophysics Data System (ADS)

    Sarantuya, Nasantogtokh; Cui, Xin; Wang, Zhi Ping

    2015-05-01

    By adopting the first-principles total energy calculations based on density functional theory (DFT), the diffuse pattern and path of hydrogen in bulk palladium are investigated by calculating the system energy of hydrogen atom occupying different positions in palladium crystal lattice. The results indicate that the most stable position of hydrogen atom in palladium crystal lattice locates at the octahedral interstice, and the tetrahedral interstice is the second stable site. Hydrogen diffusion along the indirect octahedral-tetrahedral-octahedral (O-T-O) path is energetically most favorable in transition metal palladium, and the activation energy is 0.5245 eV.

  19. Carbon-trifluoromethyl bond forming reactions and palladium-catalyzed cyanation of (hetero)aryl halides

    E-print Network

    Senecal, Todd D. (Todd Dale)

    2013-01-01

    Chapter 1 Nucleophilic trifluoromethyl sources were systematically examined in stoichiometric palladium experiments to determine the most efficient class of reagents for transmetallation. In conjunction with reductive ...

  20. Extraction of palladium from acidic solutions with the use of carbon adsorbents

    SciTech Connect

    O.N. Kononova; N.G. Goryaeva; N.B. Dostovalova; S.V. Kachin; A.G. Kholmogorov [Krasnoyarsk State University, Krasnoyarsk (Russian Federation)

    2007-08-15

    We studied the sorption of palladium(II) on LKAU-4, LKAU-7, and BAU carbon adsorbents from model hydrochloric acid solutions and the solutions of spent palladium-containing catalysts. It was found that sorbents based on charcoal (BAU) and anthracite (LKAU-4) were characterized by high sorption capacities for palladium. The kinetics of the saturation of carbon adsorbents with palladium(II) ions was studied, and it was found that more than 60% of the initial amount of Pd(II) was recovered in a 1-h contact of an adsorbent with a model solution. This value for the solutions of spent catalysts was higher than 35%.

  1. Palladium Nanoparticles by Electrospinning from Poly(acrylonitrile-co-acrylic acid)-PdCl2 Solutions. Relations between

    E-print Network

    Yanikoglu, Berrin

    Palladium Nanoparticles by Electrospinning from Poly(acrylonitrile-co-acrylic acid)-PdCl2 Solutions Manuscript Received January 12, 2004 ABSTRACT: Catalytic palladium (Pd) nanoparticles on electrospun microscopy. Spherical Pd nanoparticles were dispersed homogeneously on the electrospun nanofibers

  2. 27 CFR 479.118 - Proof of exportation.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE FIREARMS AND AMMUNITION MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS Importation and Exportation Exportation § 479.118 Proof of...

  3. 27 CFR 479.118 - Proof of exportation.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE FIREARMS AND AMMUNITION MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS Importation and Exportation Exportation § 479.118 Proof of...

  4. 27 CFR 479.118 - Proof of exportation.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE FIREARMS AND AMMUNITION MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS Importation and Exportation Exportation § 479.118 Proof of...

  5. 27 CFR 479.118 - Proof of exportation.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE FIREARMS AND AMMUNITION MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS Importation and Exportation Exportation § 479.118 Proof of...

  6. 27 CFR 479.118 - Proof of exportation.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE FIREARMS AND AMMUNITION MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS Importation and Exportation Exportation § 479.118 Proof of...

  7. 24 CFR 884.118 - Responsibilities of the owner.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...Section 884.118 Housing and Urban Development Regulations Relating to Housing and Urban Development (Continued...DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT (SECTION 8...SET-ASIDE FOR SECTION 515 RURAL RENTAL HOUSING PROJECTS...

  8. 29 CFR 570.118 - Sixteen-year minimum.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...minimum for employment in manufacturing or mining occupations. Furthermore, this age...the convenience of the user, the revised text is set forth as follows: § 570.118...minimum for employment in manufacturing or mining occupations, although under FLSA...

  9. 21 CFR 118.12 - Enforcement and compliance.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...false Enforcement and compliance. 118.12 Section...12 Enforcement and compliance. (a) Authority...Drug Administration (FDA) can enforce the food...authorized representatives of FDA to make, at any reasonable...representatives to determine compliance with the provisions...

  10. 21 CFR 118.12 - Enforcement and compliance.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...false Enforcement and compliance. 118.12 Section...12 Enforcement and compliance. (a) Authority...Drug Administration (FDA) can enforce the food...authorized representatives of FDA to make, at any reasonable...representatives to determine compliance with the provisions...

  11. 21 CFR 118.12 - Enforcement and compliance.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...false Enforcement and compliance. 118.12 Section...12 Enforcement and compliance. (a) Authority...Drug Administration (FDA) can enforce the food...authorized representatives of FDA to make, at any reasonable...representatives to determine compliance with the provisions...

  12. 44 CFR 206.118 - Disposal of housing units.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    44 Emergency Management and Assistance...118 Emergency Management and Assistance FEDERAL EMERGENCY MANAGEMENT AGENCY, DEPARTMENT...insurance, as well as flood insurance on the...necessary to protect health or safety,...

  13. 44 CFR 206.118 - Disposal of housing units.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    44 Emergency Management and Assistance...118 Emergency Management and Assistance FEDERAL EMERGENCY MANAGEMENT AGENCY, DEPARTMENT...insurance, as well as flood insurance on the...necessary to protect health or safety,...

  14. 7 CFR 400.118 - Demand for payment.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...Department of Agriculture (Continued) FEDERAL CROP INSURANCE CORPORATION, DEPARTMENT OF AGRICULTURE... GENERAL ADMINISTRATIVE REGULATIONS Debt Management-Regulations for the 1986 and Succeeding Crop Years § 400.118 Demand for...

  15. 7 CFR 400.118 - Demand for payment.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...Department of Agriculture (Continued) FEDERAL CROP INSURANCE CORPORATION, DEPARTMENT OF AGRICULTURE... GENERAL ADMINISTRATIVE REGULATIONS Debt Management-Regulations for the 1986 and Succeeding Crop Years § 400.118 Demand for...

  16. 7 CFR 400.118 - Demand for payment.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...Department of Agriculture (Continued) FEDERAL CROP INSURANCE CORPORATION, DEPARTMENT OF AGRICULTURE... GENERAL ADMINISTRATIVE REGULATIONS Debt Management-Regulations for the 1986 and Succeeding Crop Years § 400.118 Demand for...

  17. 7 CFR 400.118 - Demand for payment.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...Department of Agriculture (Continued) FEDERAL CROP INSURANCE CORPORATION, DEPARTMENT OF AGRICULTURE... GENERAL ADMINISTRATIVE REGULATIONS Debt Management-Regulations for the 1986 and Succeeding Crop Years § 400.118 Demand for...

  18. 7 CFR 400.118 - Demand for payment.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...Department of Agriculture (Continued) FEDERAL CROP INSURANCE CORPORATION, DEPARTMENT OF AGRICULTURE... GENERAL ADMINISTRATIVE REGULATIONS Debt Management-Regulations for the 1986 and Succeeding Crop Years § 400.118 Demand for...

  19. 18 CFR 11.8 - Adjustment of annual charges.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FEDERAL POWER ACT Charges for Costs of Administration, Use of Tribal Lands and Other Government Lands, and Use of Government Dams § 11.8 Adjustment of annual charges. All annual charges imposed under this subpart continue in effect as fixed...

  20. 18 CFR 11.8 - Adjustment of annual charges.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FEDERAL POWER ACT Charges for Costs of Administration, Use of Tribal Lands and Other Government Lands, and Use of Government Dams § 11.8 Adjustment of annual charges. All annual charges imposed under this subpart continue in effect as fixed...

  1. 18 CFR 11.8 - Adjustment of annual charges.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FEDERAL POWER ACT Charges for Costs of Administration, Use of Tribal Lands and Other Government Lands, and Use of Government Dams § 11.8 Adjustment of annual charges. All annual charges imposed under this subpart continue in effect as fixed...

  2. 18 CFR 11.8 - Adjustment of annual charges.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FEDERAL POWER ACT Charges for Costs of Administration, Use of Tribal Lands and Other Government Lands, and Use of Government Dams § 11.8 Adjustment of annual charges. All annual charges imposed under this subpart continue in effect as fixed...

  3. 18 CFR 11.8 - Adjustment of annual charges.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FEDERAL POWER ACT Charges for Costs of Administration, Use of Tribal Lands and Other Government Lands, and Use of Government Dams § 11.8 Adjustment of annual charges. All annual charges imposed under this subpart continue in effect as fixed...

  4. 7 CFR 1924.116-1924.118 - [Reserved

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...Agriculture (Continued) RURAL HOUSING SERVICE, RURAL BUSINESS-COOPERATIVE SERVICE, RURAL UTILITIES SERVICE, AND FARM SERVICE AGENCY...CONSTRUCTION AND REPAIR Planning and Performing Site Development Work §§ 1924.116-1924.118...

  5. View across Argonne Parade Ground, with building 118 in left ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    View across Argonne Parade Ground, with building 118 in left foreground toward Bandall Avenue Buildings in background. View to south. - Fort David A. Russell, Randall Avenue west of First Street, Cheyenne, Laramie County, WY

  6. 27 CFR 21.118 - Methyl n-butyl ketone.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... FORMULAS FOR DENATURED ALCOHOL AND RUM Specifications for Denaturants § 21.118 Methyl n -butyl ketone. (a) Acidity (as acetic acid). 0.02 percent by weight, maximum. (b) Color. Colorless. (c) Odor. Characteristic...

  7. 27 CFR 21.118 - Methyl n-butyl ketone.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... FORMULAS FOR DENATURED ALCOHOL AND RUM Specifications for Denaturants § 21.118 Methyl n -butyl ketone. (a) Acidity (as acetic acid). 0.02 percent by weight, maximum. (b) Color. Colorless. (c) Odor. Characteristic...

  8. 27 CFR 21.118 - Methyl n-butyl ketone.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... FORMULAS FOR DENATURED ALCOHOL AND RUM Specifications for Denaturants § 21.118 Methyl n -butyl ketone. (a) Acidity (as acetic acid). 0.02 percent by weight, maximum. (b) Color. Colorless. (c) Odor. Characteristic...

  9. 27 CFR 21.118 - Methyl n-butyl ketone.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... FORMULAS FOR DENATURED ALCOHOL AND RUM Specifications for Denaturants § 21.118 Methyl n -butyl ketone. (a) Acidity (as acetic acid). 0.02 percent by weight, maximum. (b) Color. Colorless. (c) Odor. Characteristic...

  10. 40 CFR 91.118 - Certification procedure-testing.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) CONTROL OF EMISSIONS FROM MARINE SPARK-IGNITION ENGINES Emission Standards and Certification Provisions § 91.118 Certification procedure—testing....

  11. 118. Stage basement. View, facing south, of the south hydraulic ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    118. Stage basement. View, facing south, of the south hydraulic ram (type D) in the middle row. Photo was taken before the stage flooring was removed. - Auditorium Building, 430 South Michigan Avenue, Chicago, Cook County, IL

  12. METHOD TO TEST ISOTOPIC SEPARATION EFFICIENCY OF PALLADIUM PACKED COLUMNS

    SciTech Connect

    Heung, L; Gregory Staack, G; James Klein, J; William Jacobs, W

    2007-06-27

    The isotopic effect of palladium has been applied in different ways to separate hydrogen isotopes for many years. At Savannah River Site palladium deposited on kieselguhr (Pd/k) is used in a thermal cycling absorption process (TCAP) to purify tritium for over ten years. The need to design columns for different throughputs and the desire to advance the performance of TCAP created the need to evaluate different column designs and packing materials for their separation efficiency. In this work, columns with variations in length, diameter and metal foam use, were tested using an isotope displacement method. A simple computer model was also developed to calculate the number of theoretical separation stages using the test results. The effects of column diameter, metal foam and gas flow rate were identified.

  13. Anomalous transport and possible phase transition in palladium nanojunctions.

    PubMed

    Scott, Gavin D; Palacios, Juan J; Natelson, Douglas

    2010-05-25

    Many phenomena in condensed matter are thought to result from competition between different ordered phases. Palladium is a paramagnetic metal close to both ferromagnetism and superconductivity and is, therefore, a potentially interesting material to consider. Nanoscale structuring of matter can modify relevant physical energy scales, leading to effects such as locally modified magnetic interactions. We present transport measurements in electromigrated palladium break junction devices showing the emergence at low temperatures of anomalous sharp features in the differential conductance. These features appear symmetrically in applied bias and exhibit a temperature dependence of their characteristic voltages reminiscent of a mean-field phase transition. The systematic variation of these voltages with zero bias conductance, together with density functional theory calculations illustrating the relationship between the magnetization of Pd and atomic coordination, suggests that the features may result from the onset of spontaneous magnetization in the nanojunction electrodes. We propose that the characteristic conductance features are related to inelastic tunneling involving magnetic excitations. PMID:20405906

  14. The catalytic inactivation of cellulase enzyme components by palladium complexes

    SciTech Connect

    Woodward, J.; Gooch, M.G.; Shultz, M.D.

    1993-10-01

    It has been discovered that sodium hexachloropalladate is a strong inhibitor of cellobiohydrolase I (CBH I) from Trichoderma reesei having an I{sub 50} of <50 {mu}M with p-nitrophenylcellobioside (PNPC) as the substrate. Similar complexes of the metals platinum, osmium, iridium, and rhodium have little effect on CBH I. Other cellulase activities (Avicelase, {beta}-glucanase) are also inhibited by the palladium complex, suggesting that inhibition of two major types of catalytic activity in cellulase are affected. Preliminary data on the kinetics of inhibition of CBH I by sodium hexachloropalladate indicate that the inhibition is reversible and, possibly, uncompetitive. It is anticipated that sodium hexachloropalladate and other palladium complexes will be useful for determining the effect of the binding of catalytically inactivated CBH I and other cellulase components on the structure of cellulose fibers.

  15. Palladium dimers adsorbed on graphene: A DFT study

    NASA Astrophysics Data System (ADS)

    Kaur, Gagandeep; Gupta, Shuchi; Dharamvir, Keya

    2015-05-01

    The 2D structure of graphene shows a great promise for enhanced catalytic activity when adsorbed with palladium. We performed a systematic density functional theory (DFT) study of the adsorption of palladium dimer (Pd2) on graphene using SIESTA package, in the generalized gradient approximation (GGA). The adsorption energy, geometry, and charge transfer of Pd2-graphene system are calculated. Both horizontal and vertical orientations of Pd2 on graphene are studied. Our calculations revealed that the minimum energy configuration for Pd dimer is parallel to the graphene sheet with its two atoms occupying centre of adjacent hexagonal rings of graphene sheet. Magnetic moment is induced for Pd dimer adsorbed on graphene in vertical orientation while horizontal orientation of Pd dimer on graphene do not exhibit magnetism. Insignificant energy differences among adsorption sites means that dimer mobility on the graphene sheet is high. There is imperceptible distortion of graphene sheet perpendicular to its plane. However, some lateral displacements are seen.

  16. Adsorbate-induced corrosion: anodic dissolution of palladium induced by chemisorbed iodine in halide-free acid solutions

    E-print Network

    Schimpf, Janemarie A

    1991-01-01

    ) Diagram of the electrochemical H-Cell apparatus. . . . . . . . . . 11 XPS spectrum for an electrochemically clean palladium foil. . 17 XPS spectrum of an iodine coated palladium electrode. . . . . . . . 18 Current potential curves for the clean (dotted...) and iodine coated 1mm palladium wire electrode. . . . . . . . . . . . 21 2 Current potential curves for the clean (dotted) electrode and four successive scans of iodine coated 1mm 2 palladium wire electrode. 23 Micromoles of Pd measured by ICP-OES vs...

  17. Palladium chloride to palladium metal two-dimensional nucleation and growth phenomena

    SciTech Connect

    Long, H.C. de; Carlin, R.T. [Air Force Academy, CO (United States). Frank J. Seiler Research Lab.

    1995-08-01

    The reduction of a monolayer of surface-bound Pd(II) to Pd(0) on a palladium substrate reveals two-dimensional nucleation and growth phenomena. Using well-known 2D nucleation-growth theories, this reduction is shown to proceed by an instantaneous nucleation and growth mechanism. However, when a submonolayer of Pd(II) is present, this mechanism fails to account for the experimentally observed high cathodic currents seen at zero time. A model incorporating preexisting Pd(0) cylindrical sites on the partially oxidized Pd(0) surface has been successfully applied to account for the discrepancy between the experimental results and current 2D theories. Using this modified 2D model, values for the mathematical product of cylindrical growth rate and the square root of the nucleation site densities have been determined, and the overpotential dependence of the growth rate has been confirmed and quantified. These 2D nucleation-growth phenomena have practical consequences on the performance of the Pd(II)/Pd(0) system as a faradaic supercapacitor, and probably on the performance of other 2D faradaic supercapacitor systems. In addition, because many electrodes undergo monolayer surface oxidation-reduction reactions in other solvent systems, especially aqueous electrolytes, these 2D nucleation-growth phenomena may play a role in these important surface-modifying redox systems as well.

  18. Investigation on the 48Ca+249-252Cf reactions synthesizing isotopes of the superheavy element 118

    E-print Network

    Mandaglio, G; Nasirov, A K; Sobiczewski, A

    2012-01-01

    The study of the $^{48}$Ca+$^{249,250,251,252}$Cf reactions in a wide energy interval around the external barrier has been achieved with the aim of investigating the dynamical effects of the entrance channel via the $^{48}$Ca induced reactions on the $^{249-252}$Cf targets and to analyze the influence of odd and even neutron composition in target on the capture, quasifission and fusion cross sections. Moreover, we also present the results of the individual evaporation residue excitation functions obtained from the de-excitation cascade of the various even-odd and even-even $^{297-300}$118 superheavy compound nuclei reached in the studied reactions, and we compare our results of the $^{294}$118 evaporation residue yields obtained in the synthesis process of the $^{48}$Ca+$^{249,250}$Cf reactions with the experimental data obtained in the $^{48}$Ca+$^{249}$Cf experiment carried out at the Flerov Laboratory of Nuclear Reactions of Dubna.

  19. Investigation on the 48Ca+249-252Cf reactions synthesizing isotopes of the superheavy element 118

    E-print Network

    G. Mandaglio; G. Giardina; A. K. Nasirov; A. Sobiczewski

    2012-12-07

    The study of the $^{48}$Ca+$^{249,250,251,252}$Cf reactions in a wide energy interval around the external barrier has been achieved with the aim of investigating the dynamical effects of the entrance channel via the $^{48}$Ca induced reactions on the $^{249-252}$Cf targets and to analyze the influence of odd and even neutron composition in target on the capture, quasifission and fusion cross sections. Moreover, we also present the results of the individual evaporation residue excitation functions obtained from the de-excitation cascade of the various even-odd and even-even $^{297-300}$118 superheavy compound nuclei reached in the studied reactions, and we compare our results of the $^{294}$118 evaporation residue yields obtained in the synthesis process of the $^{48}$Ca+$^{249,250}$Cf reactions with the experimental data obtained in the $^{48}$Ca+$^{249}$Cf experiment carried out at the Flerov Laboratory of Nuclear Reactions of Dubna.

  20. Selective palladium electrochemical deposition onto AFM-scratched silicon surfaces

    Microsoft Academic Search

    L. a c Santinacci; T. b Djenizian; H. b Hildebrand; S. a Ecoffey; H. a Mokdad; T. a Campanella; P.b Schmuki

    2003-01-01

    The present work investigates the selective electrochemical deposition of palladium nano-structures into scratches produced through thin oxide layers covering p-Si (100) surfaces. Using an atomic force microscope equipped with a single-crystalline diamond tip scratches in the 100 nm range were produced through a 10 nm thick dry oxide layer. Pd deposition was carried out in PdCl 2 (0.01 g l

  1. Molecular Dynamics Study of Plastic Deformation of Nanocrystalline Palladium

    Microsoft Academic Search

    D. V. Bachurin; P. Gumbsch

    \\u000a Atomistic simulations of tensile and compressive deformation of three-dimensional nanocrystalline palladium at room temperature\\u000a and different strain rates were perfomed. Detailed analysis of tensile straining has revealed almost no plasticity and an\\u000a absence of dislocation activity in the grains right up to the moment of intergranular cracking. During compressive straining\\u000a the sample exhibits a plastic regime brought about by the

  2. Telomerization of isoprene with phthalimide at complex palladium catalysts

    SciTech Connect

    Zakharkin, M.I.; Guseva, V.V.; Sulaimankulova, D.D.; Petrushkina, E.A.

    1988-01-10

    The telomerization of isoprene with phthalimide takes place smoothly at complex palladium catalysts with the formation of a mixture of N-dimethyloctadienyl-phthalimides, which give a mixture of seven dimethyloctadienylamines when treated with hydrazine. By comparison of the samples of all the mixtures of N-dimethyloctadienyldimethylamines by GLC we established that terpene amines are formed during the telomerization of isoprene with phthalimide followed by cleavage of the mixture of telomers with hydrazine hydrate.

  3. Study of tin oxide: Surface properties and palladium adsorption

    Microsoft Academic Search

    Khabiboulakh Katsiev

    2008-01-01

    Surface properties of various single-crystalline SnO2 surfaces were studied and the growth of palladium was investigated in the low-coverage regime. Metal - oxide structures play an important role in microelectronics and nanotechnology. They are also widely used in catalysis. Small catalytically-active metal particles on metal oxide substrates are key features in the gas sensing mechanism: they dramatically increase the sensitivity

  4. TCAP HYDROGEN ISOTOPE SEPARATION USING PALLADIUM AND INVERSE COLUMNS

    SciTech Connect

    Heung, L.; Sessions, H.; Xiao, S.

    2010-08-31

    The Thermal Cycling Absorption Process (TCAP) was further studied with a new configuration. Previous configuration used a palladium packed column and a plug flow reverser (PFR). This new configuration uses an inverse column to replace the PFR. The goal was to further improve performance. Both configurations were experimentally tested. The results showed that the new configuration increased the throughput by a factor of more than 2.

  5. Palladium Catalyzed Intramolecular Acylcyanation of Alkenes Using ?-Iminonitriles

    PubMed Central

    Rondla, Naveen R.; Ogilvie, Jodi M.; Pan, Zhongda

    2014-01-01

    Reported here is a palladium catalyzed intramolecular acylcyanation of alkenes using ?-iminonitriles. Through this method, highly functionalized indanones are synthesized in moderate to high yields using Pd(PPh3)4, without need for any additional ligands, and a common Lewis acid (ZnCl2). Additionally, the reaction tolerates substitution at various positions on the aromatic ring including electron donating, and electron withdrawing groups. PMID:24980625

  6. PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium)

    E-print Network

    124 PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium) (Data,750 7,210 7,820 9,000 Ruthenium 2,590 2,740 4,490 9,880 6,000 Iridium 520 207 896 926 1,000 Osmium 46 57,300 -- -- -- Iridium 920 -- -- -- In addition to these quantities, the Stockpile contains 406 kilograms of nonstockpile

  7. PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium)

    E-print Network

    126 PLATINUM-GROUP METALS (Platinum, palladium, rhodium, ruthenium, iridium, osmium) (Data use of PGM is in cancer chemotherapy. Other medical uses include platinum-iridium alloys in prosthetic,600 9,650 14,400 13,400 14,500 Ruthenium 7,520 15,600 11,500 9,230 9,500 Iridium 1,450 1,810 1,860 2

  8. Catalytically efficient palladium nanoparticles stabilized by "click" ferrocenyl dendrimers.

    PubMed

    Ornelas, Cátia; Salmon, Lionel; Aranzaes, Jaime Ruiz; Astruc, Didier

    2007-12-14

    1,2,3-Ferrocenyl triazole ligands generated by click reactions in dendrimers bind Pd(OAc)2 with a systematic one-to-one stoichiometry as monitored by titration using the ferrocenyl redox sensor attached to the triazole ring, and the dendritic PdII complexes formed are best reduced by methanol to form palladium nanoparticles of designed types and sizes that show excellent efficiency and selectivity in olefin hydrogenation. PMID:18361378

  9. Decolourization of azo dyes using magnesium–palladium system

    Microsoft Academic Search

    Rachna Patel; Sumathi Suresh

    2006-01-01

    Magnesium–palladium system was found to efficiently decolourize reactive black 5, sunset yellow FCF and tartrazine dyes. There is complete loss of visible range absorption peaks and extent of colour removal exceeded 95% within 24h of reaction. There is appearance of new peak(s) in the UV region and\\/or gradual and significant shift of the ?max in the UV range during 1–24h

  10. Oxidation of methanol over a palladium monolithic automotive catalyst

    Microsoft Academic Search

    Kevin A. Frankel; Tyson M. Mew; Phooi K. Lim; George W. Roberts

    1996-01-01

    The oxidation of methanol and its partial oxidation products, carbon monoxide and formaldehyde, were studied using a monolithic catalyst containing palladium. Experimental conditions simulated those in the catalytic converter of a methanol-fueled automobile. With a properly activated catalyst and a fuel-lean feed, carbon dioxide was the only carbon-containing product, and the methanol conversion above the light-off temperature of the catalyst

  11. Catalytic H2O2 decomposition on palladium surfaces 

    E-print Network

    Salinas, S. Adriana

    1998-01-01

    . Measurement of Rate of Decomposition. Surface Analysis . Auger Electron Spectroscopy. . . . Low Energy Electron Diffraction. . X-Ray Photoelectron Spectroscopy Electrochemical Methods . . Voltammetry . Potential-Step Coulometry. Materials. . Palladium... clean Pd foil is shown in Figure 9. Potential-Step Coulometry Potential-step coulometry was used to quantitate faradaic charge (Q) associated with the desired reaction. The potential was stepped from an initial potential (E = 0. 3 V), where...

  12. Microwave-assisted synthesis of palladium nanocubes and nanobars

    SciTech Connect

    Yu, Yanchun; Zhao, Yanxi [Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074 (China)] [Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074 (China); Huang, Tao, E-mail: huangt6628@yahoo.com.cn [Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074 (China)] [Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074 (China); Liu, Hanfan, E-mail: hfliu@mail.iccas.ac.cn [Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074 (China) [Key Laboratory of Catalysis and Material Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074 (China); Institute of Chemistry, Chinese Academy of Science, Beijing 100080 (China)

    2010-02-15

    Microwave was employed in the shape-controlled synthesis of palladium nanoparticles. Palladium nanocubes and nanobars with a mean size of about 23.8 nm were readily synthesized with H{sub 2}PdCl{sub 4} as a precursor, tetraethylene glycol (TEG) as both a solvent and a reducing agent in the presence of PVP and CTAB in 80 s under microwave irradiation. The structures of the as-prepared palladium nanoparticles were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and ultraviolet-visible (UV-vis) absorption spectroscopy. The formation of PdBr{sub 4}{sup 2-}due to the coordination replacement of the ligand Cl{sup -} ions in PdCl{sub 4}{sup 2-} ions by Br{sup -} ions in the presence of bromide was responsible for the synthesis of Pd nanocubes and nanobars. In addition, a milder reducing power, a higher viscosity and a stronger affinity of TEG were beneficial to the larger sizes of Pd nanocubes and nanobars.

  13. NMR studies of aging effects in palladium tritide

    SciTech Connect

    Abell, G.C.; Attalla, A.

    1988-09-01

    This paper presents Nuclear Magnetic Resonance (NMR) studies of aging phenomena in palladium tritide. /sup 3/He NMR relaxation parameters have been measured as a function of temperature for 6-, 13-, and 22-month-old beta phase palladium tritide. The most significant result of this study is the observation of a solid/fluid phase transition near 250 K of /sup 3/He that has accumulated in the PdT/sub x/ substrate via triton decay. Although the existence of solid helium at relatively high temperatures had been predicted for helium in metals, it had not previously been confirmed in any metal/helium system. The observed melting temperatures, together with the known equation of state for /sup 4/He, allow a determination of the helium density as a function of age. The atomic density obtained in this way is approximately 2.0 times that of palladium metal, agreeing with densities inferred from dilatometric measurements of other metal tritides and also with predictions based on the concept of dislocation loop punching by highly overpressurized He bubbles. The /sup 3/He signal in the 22-month-old sample was sufficiently strong to allow a detailed study of melting as a function of temperature, and provides information on the distribution of densities over the ensemble of bubbles.

  14. Methane ignition catalyzed by in situ generated palladium nanoparticles

    SciTech Connect

    Shimizu, T.; Abid, A.D.; Poskrebyshev, G.; Wang, H. [Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089 (United States); Nabity, J.; Engel, J.; Yu, J. [TDA Research, Inc., 12345 W. 52nd Ave, Wheat Ridge, CO 80033 (United States); Wickham, D. [Reaction Systems, LLC, 19039 E. Plaza Drive, Suite 290, Parker, CO 80134 (United States); Van Devener, B.; Anderson, S.L. [Department of Chemistry, University of Utah, Salt Lake City, UT 84112 (United States); Williams, S. [Air Force Research Laboratory, Mail Stop RZA, 1950 Fifth Street, WPAFB, OH 45433 (United States)

    2010-03-15

    Catalytic ignition of methane over the surfaces of freely-suspended and in situ generated palladium nanoparticles was investigated experimentally and numerically. The experiments were conducted in a laminar flow reactor. The palladium precursor was a compound (Pd(THD){sub 2}, THD: 2,2,6,6-tetramethyl-3,5-heptanedione) dissolved in toluene and injected into the flow reactor as a fine aerosol, along with a methane-oxygen-nitrogen mixture. For experimental conditions chosen in this study, non-catalytic, homogeneous ignition was observed at a furnace temperature of {proportional_to}1123 K, whereas ignition of the same mixture with the precursor was found to be {proportional_to}973 K. In situ production of Pd/PdO nanoparticles was confirmed by scanning mobility, transmission electron microscopy and X-ray photoelectron spectroscopy analyses of particles collected at the reactor exit. The catalyst particle size distribution was log-normal. Depending on the precursor loading, the median diameter ranged from 10 to 30 nm. The mechanism behind catalytic ignition was examined using a combined gas-phase and gas-surface reaction model. Simulation results match the experiments closely and suggest that palladium nanocatalyst significantly shortens the ignition delay times of methane-air mixtures over a wide range of conditions. (author)

  15. Ultrafine nanoporous palladium-aluminum film fabricated by citric acid-assisted hot-water-treatment of aluminum-palladium alloy film

    NASA Astrophysics Data System (ADS)

    Harumoto, Takashi; Tamura, Yohei; Ishiguro, Takashi

    2015-01-01

    Hot-water-treatment has been adapted to fabricate ultrafine nanoporous palladium-aluminum film from aluminum-palladium alloy film. Using citric acid as a chelating agent, a precipitation of boehmite (aluminum oxide hydroxide, AlOOH) on the nanoporous palladium-aluminum film was suppressed. According to cross-sectional scanning transmission electron microscopy observations, the ligament/pore sizes of the prepared nanoporous film were considerably small (on the order of 10 nm). Since this fabrication method only requires aluminum alloy film and hot-water with chelating agent, the ultrafine nanoporous film can be prepared simply and environmentally friendly.

  16. Synthesis and characterization of palladium and palladium-cobalt nanoparticles on Vulcan XC-72R for the oxygen reduction reaction.

    PubMed

    Arroyo-Ramírez, Lisandra; Montano-Serrano, Rubenier; Luna-Pineda, Tatiana; Román, Félix R; Raptis, Raphael G; Cabrera, Carlos R

    2013-11-27

    A single-source approach was used to synthesize bimetallic nanoparticles on a high-surface-area carbon-support surface. The synthesis of palladium and palladium-cobalt nanoparticles on carbon black (Vulcan XC-72R) by chemical and thermal reduction using organometallic complexes as precursors is described. The electrocatalysts studied were Pd/C, Pd2Co/C, and PdCo2/C. The nanoparticles composition and morphology were characterized using inductively coupled plasma mass spectrophotometer (ICP-MS), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray fluorescence spectroscopy (EDS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) techniques. Electrocatalytic activity towards the oxygen reduction reaction (ORR) and methanol tolerance in oxygen-saturated acid solution were determined. The bimetallic catalyst on carbon support synthetized by thermal reduction of the Pd2Co precursor has ORR electrocatalytic activity and a higher methanol tolerance than a Pt/C catalyst. PMID:24102312

  17. New Palladium-Catalyzed Approaches to Heterocycles and Carbocycles

    SciTech Connect

    Qinhua Huang

    2004-12-19

    The tert-butylimines of o-(1-alkynyl)benzaldehydes and analogous pyridinecarbaldehydes have been cyclized under very mild reaction conditions in the presence of I{sub 2}, ICl, PhSeCl, PhSCl and p-O{sub 2}NC{sub 6}H{sub 4}SCl to give the corresponding halogen-, selenium- and sulfur-containing disubstituted isoquinolines and naphthyridines, respectively. Monosubstituted isoquinolines and naphthyridines have been synthesized by the metal-catalyzed ring closure of these same iminoalkynes. This methodology accommodates a variety of iminoalkynes and affords the anticipated heterocycles in moderate to excellent yields. The Pd(II)-catalyzed cyclization of 2-(1-alkynyl)arylaldimines in the presence of various alkenes provides an efficient way to synthesize a variety of 4-(1-alkenyl)-3-arylisoquinolines in moderate to excellent yields. The introduction of an ortho-methoxy group on the arylaldimine promotes the Pd-catalyzed cyclization and stabilizes the resulting Pd(II) intermediate, improving the yields of the isoquinoline products. Highly substituted naphthalenes have been synthesized by the palladium-catalyzed annulation of a variety of internal alkynes, in which two new carbon-carbon bonds are formed in a single step under relatively mild reaction conditions. This method has also been used to synthesize carbazoles, although a higher reaction temperature is necessary. The process involves arylpalladation of the alkyne, followed by intramolecular Heck olefination and double bond isomerization. This method accommodates a variety of functional groups and affords the anticipated highly substituted naphthalenes and carbazoles in good to excellent yields. Novel palladium migratiodarylation methodology for the synthesis of complex fused polycycles has been developed, in which one or more sequential Pd-catalyzed intramolecular migration processes involving C-H activation are employed. The chemistry works best with electron-rich aromatics, which is in agreement with the idea that these palladium-catalyzed C-H activation reactions parallel electrophilic aromatic substitution. A relatively efficient synthesis of cyclopropanes has been developed using palladium-catalyzed C-H activation chemistry, in which two new carbon-carbon bonds are formed in a single step. This method involves the palladium-catalyzed activation of relatively unreactive C-H bonds, and provides a very efficient way to synthesize cyclopropapyrrolo[1,2-a]indoles, analogues of the mitomycin antibiotics.

  18. Long-term study of palladium in road tunnel dust and sewage sludge ash

    Microsoft Academic Search

    K. Leopold; M. Maier; S. Weber; M. Schuster

    2008-01-01

    The present work summarizes data about palladium contents of road tunnel dust from 1994 to 2007 and sewage sludge ash from 1972 to 2006. Since palladium is emitted from automotive catalytic converters as elemental particles, road dust is quiet useful to study traffic-related Pd emissions. Very high Pd values of up to 516?g Pdkg?1 were found in the road dust

  19. High temperature performance study of gold wire bonding on a palladium bonding pad

    Microsoft Academic Search

    Wardhana Aji Sasangka; A. C. Tan

    2006-01-01

    Translating technology from aluminum based to copper based semiconductor has unique issues especially in wire bonding reliability. Copper is very easy to be oxidized when exposed to the air. Palladium was added to cover copper in order to resolve this problem. Finally, the gold wire is bonded with palladium instead of copper. The performance (mechanical and strength) of this interconnection

  20. On the catalytic activity of palladium clusters generated with the electrochemical scanning tunnelling microscope

    Microsoft Academic Search

    E. P. M. Leiva; W. Schmickler

    2003-01-01

    Recent experiments have shown that small palladium clusters, deposited on Au(1 1 1) with a scanning tunnelling microscope, are better catalysts for the hydrogen evolution reaction than larger clusters, and may even be more active than bulk palladium. We suggest that the larger clusters contain an admixture of gold, which lowers the density of states at the Fermi level. In

  1. On the catalytic activity of palladium clusters generated with the electrochemical scanning tunnelling microscope

    Microsoft Academic Search

    C. G. Sánchez; E. P. M. Leiva; W. Schmickler

    2003-01-01

    Recent experiments have shown that small palladium clusters, deposited on Au(111) with a scanning tunnelling microscope, are better catalysts for the hydrogen evolution reaction than larger clusters, and may even be more active than bulk palladium. We suggest that the larger clusters contain an admixture of gold, which lowers the density of states at the Fermi level. In addition, there

  2. Interstitial modification of palladium nanoparticles with boron atoms as a green catalyst for selective hydrogenation.

    PubMed

    Chan, Chun Wong Aaron; Mahadi, Abdul Hanif; Li, Molly Meng-Jung; Corbos, Elena Cristina; Tang, Chiu; Jones, Glenn; Kuo, Winson Chun Hsin; Cookson, James; Brown, Christopher Michael; Bishop, Peter Trenton; Tsang, Shik Chi Edman

    2014-01-01

    Lindlar catalysts comprising of palladium/calcium carbonate modified with lead acetate and quinoline are widely employed industrially for the partial hydrogenation of alkynes. However, their use is restricted, particularly for food, cosmetic and drug manufacture, due to the extremely toxic nature of lead, and the risk of its leaching from catalyst surface. In addition, the catalysts also exhibit poor selectivities in a number of cases. Here we report that a non-surface modification of palladium gives rise to the formation of an ultra-selective nanocatalyst. Boron atoms are found to take residence in palladium interstitial lattice sites with good chemical and thermal stability. This is favoured due to a strong host-guest electronic interaction when supported palladium nanoparticles are treated with a borane tetrahydrofuran solution. The adsorptive properties of palladium are modified by the subsurface boron atoms and display ultra-selectivity in a number of challenging alkyne hydrogenation reactions, which outclass the performance of Lindlar catalysts. PMID:25523894

  3. COST-EFFECTIVE METHOD FOR PRODUCING SELF SUPPORTED PALLADIUM ALLOY MEMBRANES FOR USE IN EFFICIENT PRODUCTION OF COAL DERIVED HYDROGEN

    SciTech Connect

    B. Lanning; J. Arps

    2004-01-01

    Competed fabrication of an initial series of copper and palladium-copper alloy membranes in the range of 1-8 microns in thickness up to 6 inch x 8 inch in area. Films were produced using both e-beam evaporation (with and without ion assist) and magnetron sputtering from a 60%Pd/40%Cu alloy target. Pure copper and palladium-copper alloy films, with essential no intrinsic stress, were produced on both polystyrene and polyvinyl alcohol substrates. Various processing parameters and techniques were investigated in order to minimize defects and maximize uniformity in single layer films. Even though films to date are visually defect free, we are able to observe sub-micron size defects using a backlighting technique; we are currently investigating a number of methods to create a gas impermeable membrane. At present, the metal films are effectively removed from the polymer backing material by merely immersing the film in an appropriate solvent; chloroform for the polystyrene and water for the PVA. In the future we plan to investigate alternative methods for removing the polymer backing that are more suited to large scale, low-cost manufacturing.

  4. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.013 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.013 Journal of Research of the National: May 7, 2013 Published: June 6, 2013 http://dx.doi.org/10.6028/jres.118.013 1. Introduction The pose) http://dx.doi.org/10.6028/jres.118.013 Journal of Research of the National Institute of Standards

  5. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.010 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.010 Journal of Research of the National: April 24, 2013 http://dx.doi.org/10.6028/jres.118.010 1. Introduction This paper presents an effective distribution g(x,y) at the current time T. In image science, images blurred by #12;Volume 118 (2013) http://dx.doi

  6. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.009 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.009 Journal of Research of the National, 2013 Published: April 15, 2013 http://dx.doi.org/10.6028/jres.118.009 1. Introduction Ag II, like 5d). The latter two works contain 32 lines not observed by Kalus et al. #12;Volume 118 (2013) http://dx.doi

  7. Highly selective and sensitive fluorescence chemosensor for the detection of palladium species based on Tsuji-Trost reaction.

    PubMed

    Xu, Zhong-Yong; Li, Jing; Guan, Su; Zhang, Lei; Dong, Chang-Zhi

    2015-09-01

    A new chemosensor 7-nitro-2,1,3-benzoxadiazole-4-allyl-N-(thiophen-2-ylmethyl)carbamate (NBDTC) was synthesized and utilized for palladium detection based on the Tsuji-Trost reaction. NBDTC displayed specific and ratiometric fluorescent responses toward palladium species. The chemosensor showed more than 50-fold enhancement in fluorescence intensity with the presence of PEG400 and palladium because NBDTC can be transformed to NBDT under palladium-catalyzing Tsuji-Trost reaction. NBDTC displayed high selectivity and sensitivity for palladium species with the detection limit of 1.13×10(-9)M. PMID:25863454

  8. Highly selective and sensitive fluorescence chemosensor for the detection of palladium species based on Tsuji-Trost reaction

    NASA Astrophysics Data System (ADS)

    Xu, Zhong-Yong; Li, Jing; Guan, Su; Zhang, Lei; Dong, Chang-Zhi

    2015-09-01

    A new chemosensor 7-nitro-2,1,3-benzoxadiazole-4-allyl-N-(thiophen-2-ylmethyl)carbamate (NBDTC) was synthesized and utilized for palladium detection based on the Tsuji-Trost reaction. NBDTC displayed specific and ratiometric fluorescent responses toward palladium species. The chemosensor showed more than 50-fold enhancement in fluorescence intensity with the presence of PEG400 and palladium because NBDTC can be transformed to NBDT under palladium-catalyzing Tsuji-Trost reaction. NBDTC displayed high selectivity and sensitivity for palladium species with the detection limit of 1.13 × 10-9 M.

  9. Preliminary studies on palladium nanoparticle as a novel label for DNA microarray and their corresponding detection.

    PubMed

    Wang, Zhifei; Li, Hongyin; Zhen, Shuang; Zhang, Yuanying; He, Nongyue

    2013-06-01

    This paper firstly describes the preliminary results achieved by using palladium nanoparticle (Pd NP) as a novel label for the detection of DNA hybridization in DNA microarray. And two signal amplification procedures based on "the silver staining" or "the cobalt staining" are presented during above analysis. The results show that the label Pd NP-ssDNA (target) (single strand DNA(target)) performs high single base pair mismatch-discrimination capability. The succeeding silver staining or cobalt staining procedure greatly amplifies such a signal through the catalysis of Pd. For "the silver staining:' the background staining is very low and the silver deposition only occurs around Pd NPs. So such a procedure provides a alternative for "Gold Label Silver Stain" presented by Mirkin C. A. For "the cobalt staining," not only a colorimetric array but also a magnetic sensor (such as Magnetic Tunnel Junction sensor, MTJ) can be used to detect the obtained cobalt dot due to its strong magnetic property, which provides a new strategy for DNA microarray detection. So as the proof-of-concept investigations, this work proved the feasibility of the application of Pd NPs as the label in DNA microarray assay. PMID:23858969

  10. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.016 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.016 Journal of Research of the National; uncertainty; weight classes for legal metrology. Accepted: July 24, 2013 Published: August 26, 2013 http://dx.doi as redefinition of the unit of mass is considered in the coming years. #12;Volume 118 (2013) http://dx.doi.org/10

  11. Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.021 Journal of Research of the National Institute of Standards and Technology

    E-print Network

    2013-01-01

    Volume 118 (2013) http://dx.doi.org/10.6028/jres.118.021 Journal of Research of the National Institute of Standards and Technology 403 http://dx.doi.org/10.6028/jres.118.021 The Importance of Dosimetry; radiobiology protocols; radiobiology standards. Accepted: December 17, 2013 Published: December 30, 2013 http://dx.doi

  12. LLE Review 118 (January-March 2009)

    SciTech Connect

    Bittle, W., editor

    2009-08-03

    This issue has the following articles: (1) Applied Plasma Spectroscopy: Laser-Fusion Experiments; (2) Relativistic Electron-Beam Transport Studies Using High-Resolution, Coherent Transition Radiation Imaging; (3) Pressure-Driven, Resistive Magnetohydrodynamic Interchange Instabilities in Laser-Produced, High-Energy-Density Plasmas; (4) Extended Model for Polymer Cholesteric Liquid Crystal Flake Reorientation and Relaxation; (5) Modeling the Effects of Microencapsulation on the Electro-Optic Behavior of Polymer Cholesteric Liquid Crystal Flakes; (6) Capillarity and Dielectrophoresis of Liquid Deuterium; and (7) A Stable Mid-IR, GaSb-Based Diode Laser Source for Cryogenic Target Layering at the OMEGA Laser Facility.

  13. Palladium nanoparticles on InP for hydrogen detection

    PubMed Central

    2011-01-01

    Layers of palladium (Pd) nanoparticles on indium phosphide (InP) were prepared by electrophoretic deposition from the colloid solution of Pd nanoparticles. Layers prepared by an opposite polarity of deposition showed different physical and morphological properties. Particles in solution are separated and, after deposition onto the InP surface, they form small aggregates. The size of the aggregates is dependent on the time of deposition. If the aggregates are small, the layer has no lateral conductance. Forward and reverse I-V characteristics showed a high rectification ratio with a high Schottky barrier height. The response of the structure on the presence of hydrogen was monitored. PMID:21711487

  14. Synthesis of monodispersed bimetallic palladium-copper nanoscale colloids

    SciTech Connect

    Bradley, J.S.; Hill, E.W.; Klein, C. (Exxon Research and Engineering Co., Annandale, NJ (United States)); Chaudret, B.; Duteil, A. (CNRS, Toulouse (France))

    1993-03-01

    Bimetallic clusters have been the subject of many studies of the surface chemistry and catalytic properties of metal crystallites on solid supports. Mixtures of palladium acetate and copper acetate were refluxed in 2-ethoxyethanol in the presence of poly(vinylpyrrolidone) to give 40-[angstrom] alloy nanoclusters. TEM and EDAX analysis showed that the particles were homogeneously bimetallic and crystalline, with a composition determined by the ratio of the metal acetates used. Carbon monoxide adsorbed on the colloidal particles binds reversibly to both metals. 9 refs., 3 figs.

  15. Synthesis of Dihydrobenzofurans via Palladium-Catalyzed Heteroannulations

    SciTech Connect

    Roman Vladimirovich Rozhkov

    2004-12-19

    Palladium-catalyzed heteroannulation of 1,3-dienes with 3-iodo-2-alkenols, and 2-iodo-2-alkenols, as well as their amino analogs, affords the corresponding cyclic ethers and amines respectively. The presence of a {beta}-hydrogen in the vinylic halide results in {beta}-hydride elimination giving the corresponding alkyne. The presence of a bulky group in the {alpha}-position of the vinylic halide results in failure or reduced amounts of annulation products. A chloride source, pyridine base and electron-rich phosphine are essential for this reaction.

  16. Subcellular recruitment by TSG118 and TSPYL implicates a role for zinc finger protein 106 in a novel developmental pathway.

    PubMed

    Grasberger, Helmut; Bell, Graeme I

    2005-07-01

    To gain insight into the function of zinc finger protein 106 (ZFP106), we analyzed its subcellular targeting and identified its interacting proteins. Although ZFP106 was detected predominantly in the fibrillar component of the nucleolus and co-localized with the nucleolar transcriptional machinery, its overexpression did not affect transcription of pre-ribosomal RNA genes. The nucleolar association of ZFP106 did neither require ongoing ribosomal RNA synthesis nor nucleolar chromatin indicating that a protein-protein interaction confines ZFP106 to the nucleolus. Deletion analysis revealed that the C-terminal WD40 repeat region functions in nucleolar targeting. This domain interacts with the product of testis-specific gene 118 (TSG118), which also co-localizes with ZFP106 in the nucleolus. Rapid downregulation of TSG118 expression during in vitro terminal differentiation coincides with a loss of nucleolar ZFP106. By its structural features and expression, TSG118 mimics nucleostemin, a nucleolar protein linked to the proliferation potential of stem cells. A two-hybrid screen with the N-terminal region of ZFP106 as bait led to the isolation of testis-specific Y-encoded-like protein (TSPYL), a member of the nucleosome assembly protein family. A frame-shift mutation in TSPYL has recently been found to cause a sudden infant death syndrome with testis dysgenesis. Specific recruitment of ZFP106 via amino acids 412-781 into TSPYL-positive nucleoplasmic bodies requires a TSPYL domain absent in the mutant protein of patients with testis dysgenesis. These results identify ZFP106 as a potential player in a novel pathway involved in testis development. PMID:15833274

  17. Investigation of the D-Pd system interphase boundary behaviour inside the palladium by ERD using monochromatic neutrons

    NASA Astrophysics Data System (ADS)

    Skorodumov, B. G.; Yatsevich, I. O.

    1992-02-01

    Elastic recoil detection (ERD) for depth profiling of hydrogen isotopes with 14 MeV neutrons is described and used for direct observation of the interphase boundary behaviour inside a palladium membrane which was placed as a target in a diffusion cell. It was revealed that the ?-? phase transition in the non-steady-state process of gas permeability proceeds by almost flat interphase boundary movement, while the reverse, ?-?, phase transition is characterized by both a stretched interphase boundary and an anomalous temperature dependence of the gas permeability. The kinetic model of hydrogen diffusion through a two-phase zone allows us to explain the experimental results obtained. The replacement of the monoisotope by an H-D mixture does not change the picture of interphase boundary behaviour.

  18. Mechanism of palladium-catalyzed diene cyclization/hydrosilylation: direct observation of intramolecular carbometalation.

    PubMed

    Perch, Nicholas S; Widenhoefer, Ross A

    2004-05-26

    The results of kinetic, deuterium-labeling, and low-temperature NMR studies have established a mechanism for the palladium-catalyzed cyclization/hydrosilylation of dimethyl diallylmalonate (1) with triethylsilane involving rapid, irreversible conversion of the palladium silyl complex [(phen)Pd(SiEt(3))(NCAr)](+) [BAr(4)](-) [Ar = 3,5-C(6)H(3)(CF(3))(2)] (4b) and 1 to the palladium 5-hexenyl chelate complex [(phen)Pd[eta(1),eta(2)-CH(CH(2)SiEt(3))CH(2)C(CO(2)Me)(2)CH(2)CH=CH(2)

  19. Colourimetric and fluorescent probes for the optical detection of palladium ions.

    PubMed

    Li, Honglin; Fan, Jiangli; Peng, Xiaojun

    2013-10-01

    In recent years, the development of optical probes to analyse trace palladium ions (Pd(2+)) has attracted great attention because of the residual palladium released by catalytic converters or from various Pd-catalysed reactions. These residual palladium ions may cause potential health hazards. This review provides a brief introduction to the new methods used to determine trace amounts of Pd(2+), which then mainly focuses on the different reporting systems and unique mechanisms of the colourimetric and fluorescent probes used to detect Pd(2+), including Pd(2+) complex formation or Pd-catalysed reactions. PMID:23845987

  20. Behavior of palladium-copper catalysts for CO and NO elimination

    SciTech Connect

    Fernandez-Garcia, M.; Martinez-Arias, A.; Belver, C.; Anderson, J.A.; Conesa, J.C.; Soria, J.

    2000-03-10

    The behavior of a series of palladium and palladium-copper catalysts supported on ceria/alumina for the CO + NO + O{sub 2} reaction has been analyzed by a combination of electron transmission microscopy, infrared, and electron paramagnetic spectroscopies and catalytic test studies. In both systems, the catalytic behavior is dominated by the properties of the metal-ceria interface. The addition of copper to a palladium system leads to beneficial effects related to alloy formation in which both CO and NO elimination are enhanced. The chemical consequences and catalytic implications of Pd-Cu alloying are discussed.

  1. Polymer-coated palladium nanoparticle catalysts for Suzuki coupling reactions.

    PubMed

    Bortolotto, Tanize; Facchinetto, Sara Elisa; Trindade, Suelen Gauna; Ossig, Andreia; Petzhold, Cesar Liberato; Vargas, Josimar; Rodrigues, Oscar Endrigo Dorneles; Giacomelli, Cristiano; Schmidt, Vanessa

    2015-02-01

    A set of seven different palladium nanoparticle (PdNP) systems stabilized by small amounts (1.0mg/mL) of structurally related macromolecular capping agents were comparatively tested as catalyst in p-nitrophenol (Nip) reduction and Suzuki cross-coupling reactions. The observed rate constants (kobs) for Nip reduction were in the range of 0.052-3.120×10(-2)s(-1), and the variation reflected the effects of polymer chain conformation, ionic strength and palladium-polymer complex coordination. Macromolecules featuring pendant pyridyl moieties or inverse temperature-dependent solubility were found to be unsuitable capping agents for PdNPs catalysts, despite being active. The catalytic activity in Suzuki cross-coupling reactions followed the same behavior; the most active particles in the Nip reaction also mediated the cross-coupling reaction providing the expected products in quantitative yields under relatively mild conditions after only 4h at 50°C. Experiments involving the successive addition of reactants and catalyst recovery/re-use indicated that the recycling potential was comparable to those of the standards used in this field. PMID:25463188

  2. Positive-tone EUV resists: complexes of platinum and palladium

    NASA Astrophysics Data System (ADS)

    Sortland, Miriam; Del Re, Ryan; Passarelli, James; Hotalen, Jodi; Vockenhuber, Michaela; Ekinci, Yasin; Neisser, Mark; Freedman, Daniel; Brainard, Robert L.

    2015-03-01

    The EUV photoreactivity of platinum and palladium mononuclear complexes has been investigated. Many platinum and palladium complexes show little or no EUV sensitivity, however, we have found that metal carbonates and metal oxalates (L2M(CO3) and L2M(C2O4); M = Pt or Pd) are sensitive to EUV. The metal-carbonates give negative tone behavior. The most interesting result is that the metal oxalates give first positive-tone EUV resists based on mono-nuclear organometallic compounds. In particular, (dppm)Pd(C2O4) (dppm = 1,1-Bis(diphenylphosphino)methane) (25) prints 30-nm dense lines with Esize of 50 mJ/cm2. To improve the lithographic performance of (25), the processing conditions were studied. A bake study showed that bake affected sensitivity and dark loss very little, while dark loss worsened with development time. Derivatives of (25) were synthesized to explore the effect of molecular weight on resist sensitivity, but the study showed no correlation between molecular weight and sensitivity.

  3. Fast-neutron scattering from vibrational palladium nuclei

    SciTech Connect

    Smith, A.B. [Argonne National Lab., IL (United States)]|[Univ. of Arizona, Tucson, AZ (United States); Guenther, P.T. [Argonne National Lab., IL (United States)

    1993-10-01

    Neutron total cross sections of elemental palladium are measured from {approx}0.6--4.5 MeV. These results, combined with others previously reported from this laboratory, provide a detailed knowledge of the neutron total cross sections of palladium from {approx}0.1--20 MeV. Differential neutron elastic-scattering cross sections are measured from {approx}1.5--10 MeV in sufficient energy and angle detail to well define the energy-average behavior. Concurrently, neutron inelastic-scattering cross sections are measured from {approx}1.5--8 MeV. Inelastically-scattered neutron groups are observed corresponding to excitations of: 306 {+-} 14, 411 {+-} 47, {approx}494, 791 {+-} 20, 924 {+-} 20, 1,156 {+-} 24, 1,358 {+-} 35, 1,554 {+-} 47 and 1,706 {+-} 59 keV, with additional tentative groups at 1,938 and 2,059 keV. Particular attention is given to the inelastic excitation of the 2{sup +} yrast states of the even isotopes. This broad data base is examined in the context of optical-statistical and coupled-channels models. The resulting model parameters are consistent with systematic trends in this vibrational mass region previously noted at this laboratory, and provide a suitable vehicle for many applications.

  4. 118 MATHEMATICS MAGAZINE Geometry of Generalized Complex Numbers

    E-print Network

    Harkin, Anthony

    118 MATHEMATICS MAGAZINE Geometry of Generalized Complex Numbers ANTHONY A. HARKIN Division unit i other than i2 = -1 can give rise to inter- esting and useful complex number systems. The 16th to utilize the complex numbers we know today by calculating with a quantity whose square is -1. Since then

  5. Sessional Lecturer EOSC 118: Earth's Treasures: Gold and Gems

    E-print Network

    pages, · Administering the course via the Connect online course management system · Coordinating content to apply to teach EOSC 118: Earth's Treasures: Gold and Gems via online distance education for the summer term of the 2014-2015 academic year including the examination period. Please note this appointment

  6. NOAA Technical Report NMFS 118 Pictorial Guide to the Groupers

    E-print Network

    NOAA Technical Report NMFS 118 Pictorial Guide to the Groupers (Teleostei: Serranidae A. Schmitten Assistant Administrator for Fisheries The NOAA Technical Report NMFS (ISSN 0892 of the Office of Management and Budget. For sale by the U.S. Department of Commerce, National Technical Informa

  7. Institute Archives and Special Collections Building 14N-118

    E-print Network

    Reif, Rafael

    Institute Archives and Special Collections Building 14N-118 77 Massachusetts Avenue Cambridge, MA 02139-4307 http://libraries.mit.edu/archives A R C H I V E S Phone 617.253.5136 Fax 617.258.7305 Email This collection was assembled by the staff of the Institute Archives. Some publications were originally in the MIT

  8. Institute Archives and Special Collections Building 14N-118

    E-print Network

    Reif, Rafael

    Institute Archives and Special Collections Building 14N-118 77 Massachusetts Avenue Cambridge, MA 02139-4307 http://libraries.mit.edu/archives A R C H I V E S Phone 617.253.5136 Fax 617.258.7305 Email: Amy Sugarman PROVENANCE The records were given to the Institute Archives by Carroll L. Wilson in two

  9. Institute Archives and Special Collections Building 14N-118

    E-print Network

    Reif, Rafael

    Institute Archives and Special Collections Building 14N-118 77 Massachusetts Avenue Cambridge, MA 02139-4307 http://libraries.mit.edu/archives A R C H I V E S Phone 617.253.5136 Fax 617.258.7305 Email of the President (Jerome B. Wiesner), 1960-1984 Archival Collection - AC 8 254 manuscript boxes 84.6 cubic feet

  10. Credit PSR. View looks east southeast (118°) across foundations of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Credit PSR. View looks east southeast (118°) across foundations of North Base Administration Building (originally numbered T-50) toward Building 4318 (Warehouse) and Building 4305 (Unicon Portable Hangar). Building 4401 (Hangar No. 1) appears in extreme left background - Edwards Air Force Base, North Base, Administration Building T-50, D Street, Boron, Kern County, CA

  11. 118 Correspondence manuscript the relevant formulae were given in an

    E-print Network

    and §Psychology and CPO, University of Turin, Turin, Italy *Correspondence. (e-mail: caterina.guiot@unito.it) DOI118 Correspondence manuscript the relevant formulae were given in an Appendix but were deleted would like to remark that a love for accurate phrasing should never conflict with common sense. Blood

  12. Synthetic strategies for controlling inter- and intramolecular interactions: Applications in single-molecule fluorescence imaging, bioluminescence imaging, and palladium catalysis

    NASA Astrophysics Data System (ADS)

    Conley, Nicholas R.

    The field of synthetic organic chemistry has reached such maturity that, with sufficient effort and resources, the synthesis of virtually any small molecule which exhibits reasonable stability at room temperature can be realized. While representing a monumental achievement for the field, the ability to exert precise control over molecular structure is just a means to an end, and it is frequently the responsibility of the synthetic chemist to determine which molecules should actually be synthesized. For better or worse, there exists no competitive free market in academia for new molecules, and as a result, the decision of which compounds should be synthesized is seldom driven by the forces of supply and demand; rather, it is guided by the synthetic chemist's interest in an anticipated structure-function relationship or in the properties of a previously unstudied class of molecules. As a consequence, there exists a pervasive need for chemists with synthetic expertise in fields (e.g., molecular imaging) and subdisciplines of chemistry (e.g., physical chemistry) in which the identification of promising synthetic targets dramatically outpaces the synthetic output in that field or subdiscipline, and ample opportunities are available for synthetic chemists who choose to pursue such cross-disciplinary research. This thesis describes synthetic efforts that leverage these opportunities to realize applications in biological imaging and in palladium catalysis. In Part I, the synthesis and characterization of three novel luminophores and their imaging applications are discussed. The first is a molecular beacon that utilizes a fluorophorefluorophore pair which exhibits H-dimer quenching in the closed conformation. This probe offers several advantages over conventional fluorophore-quencher molecular beacons in the detection of oligonucleotides, both in bulk and at the single-molecule level. Secondly, a fluorescent, Cy3-Cy5 covalent heterodimer is reported, which on account of the proximity of the Cy3 and Cy5 fluorophores, behaves as an optical photoswitch in the presence of a thiol reagent. This unique property was employed to achieve sub-diffraction-limited imaging of the stalks of Caulobacter crescentus cells with 30-nm resolution using STORM (stochastic optical reconstruction microscopy). Lastly, the synthesis of the first selenium analogue of firefly luciferin is described, and this analogue is shown to be a competent substrate for firefly luciferase (fLuc). Remarkably, it exhibits red-shifted bioluminescence emission relative to the native sulfur analogue. The in vivo performance of the selenium and sulfur analogues in imaging are compared by tail-vein injection into nude mice bearing subcutaneous tumor xenografts of a human breast cancer cell line that was stably transduced to express fLuc. Part II of this thesis begins by addressing design considerations in the development of palladium catalysts that effect oxidative transformations under mild conditions (i.e., 1 atm air, room temperature) using molecular oxygen as the terminal oxidant. A newly synthesized cationic palladium complex, [(2,9-dimethylphenanthroline)Pd(OAc)]2[OTf]2, is shown to catalyze aerobic alcohol oxidation under such conditions with an unprecedented initial turnover frequency, but the presence of partially reduced oxygen species results in competitive ligand oxidation with concomitant decrease in catalyst activity. To remedy this, oxidatively resistant ligands, which are essential for the development of next-generation, high-turnover-frequency palladium catalysts that utilize oxygen as a terminal oxidant, have been prepared and effectively employed. In addition, the first general palladium-catalyzed route to the carbonylation of diols is reported. In this system, carbon monoxide (1 atm) serves the carbonyl source, (2,9-dimethylphenanthroline)Pd(OAc) 2 acts as the catalyst, and N-chlorosuccinimide and iodosobenzene are the oxidants for 1,2- and 1,3-diols, respectively. This thesis illustrates the power of synthetic organic chemistry to exert precise control ove

  13. Carbon-antimony bond fission in reactions of triphenylantimony with palladium(II): Crystal structures of trans-chloro(phenyl) bis(triphenylantimony) palladium(II) and trans-bromo(phenyl) bis(triphenylantimony) palladium(II)

    Microsoft Academic Search

    Ayfer Mentes; Raymond D. W. Kemmitt; John Fawcett; David R. Russell

    1997-01-01

    Triphenylantimony reacts with [PdX2cod] (X = Cl or Br; cod = cyclo-octa-1,5-diene) in refluxing dichloromethane to give the palladium phenyl complexes trans-[PdXPh(SbPh3)2]. Treatment of palladium(II) chloride with triphenylantimony in refluxing acetone—diethyl ether solution also gives trans-[PdClPh(SbPh3)2], but reaction of palladium(II) bromide with triphenylantimony affords cis-[PdBr2(SbPh3)2]. A small amount of trans-[PdClPh(SbPh3)2] is present in samples of cis-[PdCl2(SbPh3)2] prepared from the reaction

  14. 21 CFR 118.8 - Testing methodology for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Testing methodology for Salmonella Enteritidis (SE). 118.8 Section... § 118.8 Testing methodology for Salmonella Enteritidis (SE). (a) Testing...Environmental Sampling and Detection of Salmonella in Poultry Houses,” April...

  15. 21 CFR 118.8 - Testing methodology for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Testing methodology for Salmonella Enteritidis (SE). 118.8 Section... § 118.8 Testing methodology for Salmonella Enteritidis (SE). (a) Testing...Environmental Sampling and Detection of Salmonella in Poultry Houses,” April...

  16. 21 CFR 118.10 - Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan. 118.10 Section...SHELL EGGS § 118.10 Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan. (a) Records:...

  17. 21 CFR 118.10 - Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan. 118.10 Section...SHELL EGGS § 118.10 Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan. (a) Records:...

  18. 21 CFR 118.8 - Testing methodology for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Testing methodology for Salmonella Enteritidis (SE). 118.8 Section... § 118.8 Testing methodology for Salmonella Enteritidis (SE). (a) Testing...Environmental Sampling and Detection of Salmonella in Poultry Houses,” April...

  19. 21 CFR 118.10 - Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan. 118.10 Section...SHELL EGGS § 118.10 Recordkeeping requirements for the Salmonella Enteritidis (SE) prevention plan. (a) Records:...

  20. 41 CFR 102-118.30 - Are Government corporations bound by this part?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Are Government corporations bound by this part? 102-118.30 Section...102-118.30 Are Government corporations bound by this part? No, Government corporations are not bound by this part. However, they may...

  1. 14 CFR 1230.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...definite plans for involvement of human subjects. 1230.118 Section 1230.118...ADMINISTRATION PROTECTION OF HUMAN SUBJECTS (Eff. until 2-14-14) § 1230...definite plans for involvement of human subjects. Certain types of...

  2. 12 CFR 1010.118 - Receipt, agent certification, and cancellation page.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...agent certification, and cancellation page. 1010.118 Section 1010.118 ...agent certification, and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance...

  3. 24 CFR 1710.118 - Receipt, agent certification and cancellation page.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...agent certification and cancellation page. 1710.118 Section 1710.118 ...agent certification and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance with...

  4. 12 CFR 1010.118 - Receipt, agent certification, and cancellation page.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...agent certification, and cancellation page. 1010.118 Section 1010.118 ...agent certification, and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance...

  5. 24 CFR 1710.118 - Receipt, agent certification and cancellation page.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...agent certification and cancellation page. 1710.118 Section 1710.118 ...agent certification and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance with...

  6. 24 CFR 1710.118 - Receipt, agent certification and cancellation page.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...agent certification and cancellation page. 1710.118 Section 1710.118 ...agent certification and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance with...

  7. 24 CFR 1710.118 - Receipt, agent certification and cancellation page.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...agent certification and cancellation page. 1710.118 Section 1710.118 ...agent certification and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance with...

  8. 12 CFR 1010.118 - Receipt, agent certification, and cancellation page.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...agent certification, and cancellation page. 1010.118 Section 1010.118 ...agent certification, and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance...

  9. 24 CFR 1710.118 - Receipt, agent certification and cancellation page.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...agent certification and cancellation page. 1710.118 Section 1710.118 ...agent certification and cancellation page. (a) Format. The receipt, agent certification and cancellation page shall be prepared in accordance with...

  10. 50 CFR 86.118 - What does this survey instrument include?

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false What does this survey instrument include? 86.118 Section 86...PROGRAM How States Will Complete Access Needs Surveys § 86.118 What does this survey instrument include? (a) We divided...

  11. 32 CFR 219.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...lacking definite plans for involvement of human subjects. 219.118 Section 219...CONTINUED) MISCELLANEOUS PROTECTION OF HUMAN SUBJECTS § 219.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  12. 40 CFR 26.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...lacking definite plans for involvement of human subjects. 26.118 Section 26.118...PROTECTION AGENCY GENERAL PROTECTION OF HUMAN SUBJECTS Basic EPA Policy for Protection of Subjects in Human Research Conducted or Supported by EPA...

  13. 45 CFR 46.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...proposals lacking definite plans for involvement of human subjects. 46.118 Section 46.118 Public Welfare DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL ADMINISTRATION PROTECTION OF HUMAN SUBJECTS Basic HHS Policy for...

  14. 14 CFR 1230.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...lacking definite plans for involvement of human subjects. 1230.118 Section 1230...AND SPACE ADMINISTRATION PROTECTION OF HUMAN SUBJECTS § 1230.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  15. 10 CFR 745.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...lacking definite plans for involvement of human subjects. 745.118 Section 745... DEPARTMENT OF ENERGY PROTECTION OF HUMAN SUBJECTS § 745.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  16. 34 CFR 97.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...proposals lacking definite plans for involvement of human subjects. 97.118 Section 97.118...Secretary, Department of Education PROTECTION OF HUMAN SUBJECTS Federal Policy for the Protection of Human Subjects (Basic ED Policy for...

  17. 16 CFR 1028.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...lacking definite plans for involvement of human subjects. 1028.118 Section 1028...SAFETY COMMISSION GENERAL PROTECTION OF HUMAN SUBJECTS § 1028.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  18. 22 CFR 225.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...lacking definite plans for involvement of human subjects. 225.118 Section 225...INTERNATIONAL DEVELOPMENT PROTECTION OF HUMAN SUBJECTS § 225.118 Applications...lacking definite plans for involvement of human subjects. Certain types...

  19. 27 CFR 478.118 - Importation of certain firearms classified as curios or relics.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...false Importation of certain firearms classified as curios or relics. 478.118 ...118 Importation of certain firearms classified as curios or relics. Notwithstanding...importer may import all rifles and shotguns classified by the Director as curios or...

  20. 25 CFR 900.118 - Do these “construction contract” regulations apply to construction management services?

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...âconstruction contractâ regulations apply to construction management services? 900.118 Section...SELF-DETERMINATION AND EDUCATION ASSISTANCE ACT Construction § 900.118 Do these “construction contract” regulations apply to...

  1. 25 CFR 900.118 - Do these “construction contract” regulations apply to construction management services?

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...âconstruction contractâ regulations apply to construction management services? 900.118 Section...SELF-DETERMINATION AND EDUCATION ASSISTANCE ACT Construction § 900.118 Do these “construction contract” regulations apply to...

  2. 25 CFR 900.118 - Do these “construction contract” regulations apply to construction management services?

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...âconstruction contractâ regulations apply to construction management services? 900.118 Section...SELF-DETERMINATION AND EDUCATION ASSISTANCE ACT Construction § 900.118 Do these “construction contract” regulations apply to...

  3. 25 CFR 900.118 - Do these “construction contract” regulations apply to construction management services?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...âconstruction contractâ regulations apply to construction management services? 900.118 Section...SELF-DETERMINATION AND EDUCATION ASSISTANCE ACT Construction § 900.118 Do these “construction contract” regulations apply to...

  4. 25 CFR 900.118 - Do these “construction contract” regulations apply to construction management services?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...âconstruction contractâ regulations apply to construction management services? 900.118 Section...SELF-DETERMINATION AND EDUCATION ASSISTANCE ACT Construction § 900.118 Do these “construction contract” regulations apply to...

  5. 50 CFR 86.118 - What does this survey instrument include?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false What does this survey instrument include? 86.118 Section 86...PROGRAM How States Will Complete Access Needs Surveys § 86.118 What does this survey instrument include? (a) We divided...

  6. 50 CFR 86.118 - What does this survey instrument include?

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false What does this survey instrument include? 86.118 Section 86...PROGRAM How States Will Complete Access Needs Surveys § 86.118 What does this survey instrument include? (a) We divided...

  7. 50 CFR 86.118 - What does this survey instrument include?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false What does this survey instrument include? 86.118 Section 86...PROGRAM How States Will Complete Access Needs Surveys § 86.118 What does this survey instrument include? (a) We divided...

  8. Solvent extraction of palladium(II) with a Schiff base and separation of palladium from Pd(II)-Pt(VI) mixture

    SciTech Connect

    Ouyang, J.M.

    1999-09-01

    A new Schiff base extractant, N,N{prime}-bis[1-phenyl-3-methyl-5-hydroxy-pyrazole-4-benzylidenyl]-1,3-propylene diamine (H{sub 2}A) was synthesized and characterized. The extraction mechanism of palladium(II) from HNO{sub 3} or HCIO{sub 2} medium with H{sub 2}A in chloroform or toluene was investigated. The influences of the Schiff base concentration in the organic phase, the concentration of palladium, the pH and anions (Cl{sup {minus}}, SO{sub 4}{sup =}, NO{sub 3}{sup {minus}}, ClO{sub 4}{sup {minus}}) in the aqueous phase and the temperature on the distribution ration for palladium (II) have been examined. The extracted complex has been confirmed by chemical analysis, thermoanalyses and IR spectroscopy. It was found that palladium is extracted according to the following extraction reaction: Pd(H{sub 2}O){sub 2}Cl{sub 2(a)} + H{sub 2}A{sub (o)} == Pd(HA)Cl{sub (o)}+H{sup +}{sub (a)} + Cl{sup {minus}}{sub (a)} + 2H{sub 2}O. The extraction equilibrium constants of palladium(II) were 8.4 and 21.3 in chloroform and toluene diluents, respectively. The values for the enthalpy and standard free energy of extraction were also obtained. The separation of Pd(II) from the mixed solution of Pd(II)-Pt(IV) was achieved by adjusting the pH.

  9. Wet processing of palladium for use in the tritium facility at Westinghouse, Savannah River, SC. Preparation of palladium using the Mound Muddy Water process

    SciTech Connect

    Baldwin, D.P.; Zamzow, D.S.

    1998-11-10

    Palladium used at Savannah River for tritium storage is currently obtained from a commercial source. In order to better understand the processes involved in preparing this material, Savannah River is supporting investigations into the chemical reactions used to synthesize this material and into the conditions necessary to produce palladium powder that meets their specifications. This better understanding may help to guarantee a continued reliable source for this material in the future. As part of this evaluation, a work-for-others contract between Westinghouse Savannah River Company and the Ames Laboratory Metallurgy and Ceramics Program was initiated. During FY98, the process for producing palladium powder developed in 1986 by Dan Grove of Mound Applied Technologies (USDOE) was studied to understand the processing conditions that lead to changes in morphology in the final product. This report details the results of this study of the Mound Muddy Water process, along with the results of a round-robin analysis of well-characterized palladium samples that was performed by Savannah River and Ames Laboratory. The Mound Muddy Water process is comprised of three basic wet chemical processes, palladium dissolution, neutralization, and precipitation, with a number of filtration steps to remove unwanted impurity precipitates.

  10. Cascade Palladium Catalysis: A Predictable and Selectable Regiocontrolled Synthesis of N-Arylbenzimidazoles

    E-print Network

    Jui, Nathan T.

    By choice: The palladium-catalyzed cascade reaction of 2-chloroaryl sulfonates with arylamine and amide nucleophiles provides direct access to N-arylbenzimidazoles. This strategy selectively produces the heterocycles based ...

  11. Envisaging palladium chemical transport mechanism from fuel kernel pellet to SiC cladding by bromination

    NASA Astrophysics Data System (ADS)

    Arias, F. J.

    2012-07-01

    The SiC cladding corrosion in pellets by direct palladium chemical transport from fuel kernel through gap to SiC cladding by direct bromination is envisaged as feasible mechanism in corrosion of SiC pellets.

  12. Low-temperature carbon monoxide oxidation catalysed by regenerable atomically dispersed palladium on alumina

    NASA Astrophysics Data System (ADS)

    Peterson, Eric J.; Delariva, Andrew T.; Lin, Sen; Johnson, Ryan S.; Guo, Hua; Miller, Jeffrey T.; Hun Kwak, Ja; Peden, Charles H. F.; Kiefer, Boris; Allard, Lawrence F.; Ribeiro, Fabio H.; Datye, Abhaya K.

    2014-09-01

    Catalysis by single isolated atoms of precious metals has attracted much recent interest, as it promises the ultimate in atom efficiency. Most previous reports are on reducible oxide supports. Here we show that isolated palladium atoms can be catalytically active on industrially relevant ?-alumina supports. The addition of lanthanum oxide to the alumina, long known for its ability to improve alumina stability, is found to also help in the stabilization of isolated palladium atoms. Aberration-corrected scanning transmission electron microscopy and operando X-ray absorption spectroscopy confirm the presence of intermingled palladium and lanthanum on the ?-alumina surface. Carbon monoxide oxidation reactivity measurements show onset of catalytic activity at 40?°C. The catalyst activity can be regenerated by oxidation at 700?°C in air. The high-temperature stability and regenerability of these ionic palladium species make this catalyst system of potential interest for low-temperature exhaust treatment catalysts.

  13. Palladium-Silver Isotopic Systematics in Muonionalusta and Fractionation in the IVA Iron Meteorite Parent Body

    NASA Astrophysics Data System (ADS)

    Horan, M. F.; Carlson, R. W.; Alexander, C. M. O'd.; Blichert-Toft, J.

    2011-03-01

    Palladium-silver isotope data for Group IVA iron meteorite Muonionalusta (Pb-Pb age = 4565 Ma) suggest lower initial 107Pd than chondrites, higher Pd/Ag prior to troilite crystallization, and ~8% S in the bulk meteorite.

  14. Palladium-catalyzed C-C, C-N and C-O bond formation

    E-print Network

    Huang, Xiaohua, 1973-

    2003-01-01

    New methods for Pd-catalyzed cross-coupling reactions of aryl halides or arenesulfonates are described. Key to the success of these transformations is the proper choice of ligand and reaction conditions. Palladium catalysts ...

  15. Phase equilibria in the palladium-rich part of the gallium–palladium system. The crystal structures of Ga 3Pd 7 and Ga 1? x Pd 2+ x

    Microsoft Academic Search

    Christoph Wannek; Bernd Harbrecht

    2001-01-01

    The phase relations between the palladium-rich phases of the gallium–palladium system are clarified by combining preparative methodologies with powder X-ray diffraction and thermochemical analyses. A modified phase diagram of the palladium-rich part of the system is presented. The structure of Ga3Pd7, decomposing peritectoidally at 881(2)°C, was determined by powder X-ray diffraction and refined by a Rietveld profile fit. Ga3Pd7 adopts

  16. 41 CFR 102-118.240 - How does my agency get GBL and GTR forms?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false How does my agency get GBL and GTR forms? 102-118.240 Section 102-118... § 102-118.240 How does my agency get GBL and GTR forms? Your agency can get GBL and GTR forms, in either blank or...

  17. 41 CFR 102-118.240 - How does my agency get GBL and GTR forms?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 false How does my agency get GBL and GTR forms? 102-118.240 Section 102-118... § 102-118.240 How does my agency get GBL and GTR forms? Your agency can get GBL and GTR forms, in either blank or...

  18. 41 CFR 102-118.240 - How does my agency get GBL and GTR forms?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 false How does my agency get GBL and GTR forms? 102-118.240 Section 102-118... § 102-118.240 How does my agency get GBL and GTR forms? Your agency can get GBL and GTR forms, in either blank or...

  19. 41 CFR 102-118.115 - Must my agency use a GBL?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 false Must my agency use a GBL? 102-118.115 Section 102-118.115...Services § 102-118.115 Must my agency use a GBL? No, your agency is not required to use a GBL and must use commercial payment...

  20. 41 CFR 102-118.115 - Must my agency use a GBL?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Must my agency use a GBL? 102-118.115 Section 102-118.115...Services § 102-118.115 Must my agency use a GBL? No, your agency is not required to use a GBL and must use commercial payment...

  1. 41 CFR 102-118.240 - How does my agency get GBL and GTR forms?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 false How does my agency get GBL and GTR forms? 102-118.240 Section 102-118... § 102-118.240 How does my agency get GBL and GTR forms? Your agency can get GBL and GTR forms, in either blank or...

  2. 41 CFR 102-118.240 - How does my agency get GBL and GTR forms?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false How does my agency get GBL and GTR forms? 102-118.240 Section 102-118... § 102-118.240 How does my agency get GBL and GTR forms? Your agency can get GBL and GTR forms, in either blank or...

  3. 41 CFR 102-118.115 - Must my agency use a GBL?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Must my agency use a GBL? 102-118.115 Section 102-118.115...Services § 102-118.115 Must my agency use a GBL? No, your agency is not required to use a GBL and must use commercial payment...

  4. 41 CFR 102-118.115 - Must my agency use a GBL?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 false Must my agency use a GBL? 102-118.115 Section 102-118.115...Services § 102-118.115 Must my agency use a GBL? No, your agency is not required to use a GBL and must use commercial payment...

  5. 41 CFR 102-118.115 - Must my agency use a GBL?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 false Must my agency use a GBL? 102-118.115 Section 102-118.115...Services § 102-118.115 Must my agency use a GBL? No, your agency is not required to use a GBL and must use commercial payment...

  6. 33 CFR 118.75 - Lights on single-opening drawbridges.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Lights on single-opening drawbridges. 118.75 Section 118...SIGNALS § 118.75 Lights on single-opening drawbridges. (a) Bridges in this...folding, pontoon and similar type single opening drawbridges are included in this...

  7. 33 CFR 118.95 - Lights on structures not part of a bridge or approach structure.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 2011-07-01 false Lights on structures not part of a bridge or approach structure. 118.95 Section 118.95 Navigation...AND OTHER SIGNALS § 118.95 Lights on structures not part of a bridge or approach...

  8. 15 CFR 27.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...15 Commerce and Foreign Trade 1 2012-01-01 2012-01-01...definite plans for involvement of human subjects. 27.118 Section...118 Commerce and Foreign Trade Office of the Secretary of Commerce PROTECTION OF HUMAN SUBJECTS § 27.118...

  9. 15 CFR 27.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...15 Commerce and Foreign Trade 1 2013-01-01 2013-01-01...definite plans for involvement of human subjects. 27.118 Section...118 Commerce and Foreign Trade Office of the Secretary of Commerce PROTECTION OF HUMAN SUBJECTS § 27.118...

  10. 15 CFR 27.118 - Applications and proposals lacking definite plans for involvement of human subjects.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...15 Commerce and Foreign Trade 1 2014-01-01 2014-01-01...definite plans for involvement of human subjects. 27.118 Section...118 Commerce and Foreign Trade Office of the Secretary of Commerce PROTECTION OF HUMAN SUBJECTS § 27.118...

  11. Acid Chloride Synthesis by the Palladium-Catalyzed Chlorocarbonylation of Aryl Bromides.

    PubMed

    Quesnel, Jeffrey S; Kayser, Laure V; Fabrikant, Alexander; Arndtsen, Bruce A

    2015-06-22

    We report a palladium-catalyzed method to synthesize acid chlorides by the chlorocarbonylation of aryl bromides. Mechanistic studies suggest the combination of sterically encumbered PtBu3 and CO coordination to palladium can rapidly equilibrate the oxidative addition/reductive elimination of carbon-halogen bonds. This provides a useful method to assemble highly reactive acid chlorides from stable and available reagents, and can be coupled with subsequent nucleophilic reactions to generate new classes of carbonylated products. PMID:25982536

  12. Comparative Investigation of Chemical Vapor Deposition of Palladium Nanoparticles on Different Carbon Substrates

    Microsoft Academic Search

    A. Safavi; N. Maleki; M. M. Doroodmand

    2012-01-01

    The effects of different sulfur-doped carbon substrates including single-walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs), carbon nanofibers (CNFs), and activated carbon were compared for deposition of palladium nanoparticles synthesized by chemical vapor deposition method. Electron microscopy, spectroscopic techniques, and thermogravimetric analysis were used for characterization of palladium nanoparticles doped on carbon substrates. The results demonstrated that under similar conditions,

  13. The behavior of palladium catalysts in direct formic acid fuel cells

    Microsoft Academic Search

    Yimin Zhu; Zakia Khan; R. I. Masel

    2005-01-01

    Previous work has considered the behavior of platinum based catalysts in direct methanol and Direct Formic Acid Fuel Cells (DFAFCs). In this paper, we explore the behavior of palladium-based anode catalyst for DFAFCs. The palladium catalysts produce significant performance enhancements. DFAFCs operated with dry air and zero back-pressure can generate power densities of 255?230mWcm?2 at relatively high voltages of 0.40?0.50V

  14. Multiphoton lithography of nanocrystalline platinum and palladium for site-specific catalysis in 3D microenvironments.

    PubMed

    Zarzar, Lauren D; Swartzentruber, B S; Harper, Jason C; Dunphy, Darren R; Brinker, C Jeffrey; Aizenberg, Joanna; Kaehr, Bryan

    2012-03-01

    Integration of catalytic nanostructured platinum and palladium within 3D microscale structures or fluidic environments is important for systems ranging from micropumps to microfluidic chemical reactors and energy converters. We report a straightforward procedure to fabricate microscale patterns of nanocrystalline platinum and palladium using multiphoton lithography. These materials display excellent catalytic, electrical, and electrochemical properties, and we demonstrate high-resolution integration of catalysts within 3D defined microenvironments to generate directed autonomous particle and fluid transport. PMID:22335831

  15. Transfer hydrogenation using recyclable polyurea-encapsulated palladium: efficient and chemoselective reduction of aryl ketones.

    PubMed

    Yu, Jin-Quan; Wu, Hai-Chen; Ramarao, Chandrashekar; Spencer, Jonathan B; Ley, Steven V

    2003-03-21

    A robust and recyclable palladium catalyst [Pd0EnCat] has been prepared by ligand exchange of polyurea-encapsulated palladium(II) acetate with formic acid, resulting in deposition of Pd(0) in the support material; Pd0EnCat is shown to be a highly efficient transfer hydrogenation catalyst for chemoselective reduction of a wide range of aryl ketones to benzyl alcohols. PMID:12703769

  16. Properties of lead-free conductive thick films of co-precipitated silver–palladium powders

    Microsoft Academic Search

    V. Deshpande; A. Kshirsagar; S. Rane; T. Seth; G. J. Phatak; U. P. Mulik; D. P. Amalnerkar

    2005-01-01

    Silver–palladium alloy films were made by thick film technique using three types of powders prepared by co-precipitation route. The powders were prepared by varying the palladium weight contents (5, 10 and 15% Pd and denoted as Pd5, Pd10 and Pd15, respectively). The powders were analyzed by XRD, SEM\\/EDAX and TG\\/DTA. The average particle size of the prepared powders ranged from

  17. Electrolytic extraction of palladium from nitric acid and simulated high-level liquid waste

    Microsoft Academic Search

    M. Jayakumar; K. A. Venkatesan; T. G. Srinivasan; P. R. Vasudeva Rao

    2009-01-01

    Electrochemical behavior of palladium (II) nitrate in nitric acid medium and simulated high-level liquid waste has been investigated to explore the feasibility of recovering this potentially useful fission product from high-level liquid waste. The cyclic voltammogram of palladium (II) in nitric acid medium at stainless steel electrode consists of a cathodic wave occurring at an onset of -0.4 V (vs.

  18. A novel lead compound CM-118: antitumor activity and new insight into the molecular mechanism and combination therapy strategy in c-Met- and ALK-dependent cancers.

    PubMed

    Meng, Lanfang; Shu, Mengjun; Chen, Yaqing; Yang, Dexiao; He, Qun; Zhao, Hui; Feng, Zhiyong; Liang, Chris; Yu, Ker

    2014-06-01

    The anaplastic lymphoma kinase (ALK) and the c-Met receptor tyrosine kinase play essential roles in the pathogenesis in multiple human cancers and present emerging targets for cancer treatment. Here, we describe CM-118, a novel lead compound displaying low nanomolar biochemical potency against both ALK and c-Met with selectivity over>90 human kinases. CM-118 potently abrogated hepatocyte growth factor (HGF)-induced c-Met phosphorylation and cell migration, phosphorylation of ALK, EML4-ALK, and ALK resistance mutants in transfected cells. CM-118 inhibited proliferation and/or induced apoptosis in multiple c-Met- and ALK-addicted cancer lines with dose response profile correlating target blockade. We show that the CM-118-induced apoptosis in c-Met-amplified H1993 NSCLC cells involved a rapid suppression of c-Met activity and c-Met-to-EGFR cross-talk, and was profoundly potentiated by EGFR inhibitors as shown by the increased levels of apoptotic proteins cleaved-PARP and Bim as well as reduction of the survival protein Mcl-1. Bim-knockdown or Mcl-1 overexpression each significantly attenuated apoptosis. We also revealed a key role by mTOR in mediating CM-118 action against the EML4-ALK-dependent NSCLC cells. Abrogation of EML4-ALK in H2228 cells profoundly reduced signaling capacity of the rapamycin-sensitive mTOR pathway leading to G 1 cell cycle arrest and mitochondrial hyperpolarization, a metabolic perturbation linked to mTOR inhibition. Depletion of mTOR or mTORC1 inhibited H2228 cell growth, and mTOR inhibitors potentiated CM-118's antitumor activity in vitro and in vivo. Oral administration of CM-118 at a wide range of well tolerated dosages diminished c-Met- and ALK phosphorylation in vivo, and caused tumor regression or growth inhibition in multiple c-Met- and ALK-dependent tumor xenografts in mice. CM-118 exhibits favorable pharmacokinetic and drug metabolism properties hence presents a candidate for clinical evaluation. PMID:24618813

  19. H-point standard addition method—First derivative spectrophotometry for simultaneous determination of palladium and cobalt

    Microsoft Academic Search

    Habibollah Eskandari

    2006-01-01

    H-point standard addition method (HPSAM) has been applied for simultaneous determination of palladium and cobalt in trace levels, using disodium 1-nitroso-2-naphthol-3, 6-disulphonate (nitroso-R salt) as a selective chromogenic reagent. Palladium and cobalt in the neutral pHs form red color complexes with nitroso-R in aqueous solutions and making spectrophotometric monitoring possible. Simultaneous determination of palladium and cobalt were performed by HPSAM—first

  20. Determination of platinum and palladium in geological materials by neutron-activation analysis after fire-assay preconcentration

    USGS Publications Warehouse

    Rowe, J.J.; Simon, F.O.

    1971-01-01

    Fire-asay preconcentration followed by neutron-activation analysis permits the determination of as little as 0.5 ppM of platinum and 0.5 ppM of palladium on a 20-g sample. Platinum and palladium are separated with carriers and beta-counted. Results for the platinum and palladium content of seven U.S.G.S. standard rocks are presented. ?? 1971.

  1. The application of infrared spectroscopy to probe the surface morphology of alumina-supported palladium catalysts.

    PubMed

    Lear, Timothy; Marshall, Robert; Lopez-Sanchez, J Antonio; Jackson, S David; Klapötke, Thomas M; Bäumer, Marcus; Rupprechter, Günther; Freund, Hans-Joachim; Lennon, David

    2005-11-01

    Five alumina-supported palladium catalysts have been prepared from a range of precursor compounds [palladium(II) nitrate, palladium(II) chloride, palladium(II) acetylacetonate, and tetraamminepalladium(II) tetraazidopalladate(II)] and at different metal loadings (1-7.3 wt %). Collectively, this series of catalysts provides a range of metal particle sizes (1.2-8.5 nm) that emphasize different morphological aspects of the palladium crystallites. The infrared spectra of chemisorbed CO applied under pulse-flow conditions reveal distinct groupings between metal crystallites dominated by low index planes and those that feature predominantly corner/edge atoms. Temperature-programmed infrared spectroscopy establishes that the linear CO band can be resolved into contributions from corner atoms and a combination of (111)(111) and (111)(100) particle edges. Propene hydrogenation has been used as a preliminary assessment of catalytic performance for the 1 wt % loaded catalysts, with the relative inactivity of the catalyst prepared from palladium(II) chloride attributed to a diminished hydrogen supply due to decoration of edge sites by chlorine originating from the preparative process. It is anticipated that refinements linking the vibrational spectrum of a probe molecule with surface structure and accessible adsorption sites for such a versatile catalytic substrate provide a platform against which structure/reactivity relationships can be usefully developed. PMID:16375556

  2. The application of infrared spectroscopy to probe the surface morphology of alumina-supported palladium catalysts

    NASA Astrophysics Data System (ADS)

    Lear, Timothy; Marshall, Robert; Antonio Lopez-Sanchez, J.; Jackson, S. David; Klapötke, Thomas M.; Bäumer, Marcus; Rupprechter, Günther; Freund, Hans-Joachim; Lennon, David

    2005-11-01

    Five alumina-supported palladium catalysts have been prepared from a range of precursor compounds [palladium(II) nitrate, palladium(II) chloride, palladium(II) acetylacetonate, and tetraamminepalladium(II) tetraazidopalladate(II)] and at different metal loadings (1-7.3wt%). Collectively, this series of catalysts provides a range of metal particle sizes (1.2-8.5nm) that emphasize different morphological aspects of the palladium crystallites. The infrared spectra of chemisorbed CO applied under pulse-flow conditions reveal distinct groupings between metal crystallites dominated by low index planes and those that feature predominantly corner/edge atoms. Temperature-programmed infrared spectroscopy establishes that the linear CO band can be resolved into contributions from corner atoms and a combination of (111)/(111) and (111)/(100) particle edges. Propene hydrogenation has been used as a preliminary assessment of catalytic performance for the 1wt% loaded catalysts, with the relative inactivity of the catalyst prepared from palladium(II) chloride attributed to a diminished hydrogen supply due to decoration of edge sites by chlorine originating from the preparative process. It is anticipated that refinements linking the vibrational spectrum of a probe molecule with surface structure and accessible adsorption sites for such a versatile catalytic substrate provide a platform against which structure/reactivity relationships can be usefully developed.

  3. Bio?palladium: from metal recovery to catalytic applications

    PubMed Central

    De Corte, Simon; Hennebel, Tom; De Gusseme, Bart; Verstraete, Willy; Boon, Nico

    2012-01-01

    Summary While precious metals are available to a very limited extent, there is an increasing demand to use them as catalyst. This is also true for palladium (Pd) catalysts and their sustainable recycling and production are required. Since Pd catalysts exist nowadays mostly under the form of nanoparticles, these particles need to be produced in an environment?friendly way. Biological synthesis of Pd nanoparticles (‘bio?Pd’) is an innovative method for both metal recovery and nanocatalyst synthesis. This review will discuss the different bio?Pd precipitating microorganisms, the applications of the catalyst (both for environmental purposes and in organic chemistry) and the state of the art of the reactors based on the bio?Pd concept. In addition, some main challenges are discussed, which need to be overcome in order to create a sustainable nanocatalyst. Finally, some outlooks for bio?Pd in environmental technology are presented. PMID:21554561

  4. Comparative modelling of chemical ordering in palladium-iridium nanoalloys

    NASA Astrophysics Data System (ADS)

    Davis, Jack B. A.; Johnston, Roy L.; Rubinovich, Leonid; Polak, Micha

    2014-12-01

    Chemical ordering in "magic-number" palladium-iridium nanoalloys has been studied by means of density functional theory (DFT) computations, and compared to those obtained by the Free Energy Concentration Expansion Method (FCEM) using derived coordination dependent bond energy variations (CBEV), and by the Birmingham Cluster Genetic Algorithm using the Gupta potential. Several compositions have been studied for 38- and 79-atom particles as well as the site preference for a single Ir dopant atom in the 201-atom truncated octahedron (TO). The 79- and 38-atom nanoalloy homotops predicted for the TO by the FCEM/CBEV are shown to be, respectively, the global minima and competitive low energy minima. Significant reordering of minima predicted by the Gupta potential is seen after reoptimisation at the DFT level.

  5. Optical absorption spectra of palladium doped gold cluster cations.

    PubMed

    Kaydashev, Vladimir E; Janssens, Ewald; Lievens, Peter

    2015-01-21

    Photoabsorption spectra of gas phase Au(n)(+) and Au(n-1)Pd(+) (13 ? n ? 20) clusters were measured using mass spectrometric recording of wavelength dependent Xe messenger atom photodetachment in the 1.9-3.4 eV photon energy range. Pure cationic gold clusters consisting of 15, 17, and 20 atoms have a higher integrated optical absorption cross section than the neighboring sizes. It is shown that the total optical absorption cross section increases with size and that palladium doping strongly reduces this cross section for all investigated sizes and in particular for n = 14-17 and 20. The largest reduction of optical absorption upon Pd doping is observed for n = 15. PMID:25612712

  6. Spectroscopic study of low-temperature hydrogen absorption in palladium

    NASA Astrophysics Data System (ADS)

    Ienaga, K.; Takata, H.; Onishi, Y.; Inagaki, Y.; Tsujii, H.; Kimura, T.; Kawae, T.

    2015-01-01

    We report real-time detection of hydrogen (H) absorption in metallic palladium (Pd) nano-contacts immersed in liquid H2 using inelastic electron spectroscopy (IES). After introduction of liquid H2, the spectra exhibit the time evolution from the pure Pd to the Pd hydride, indicating that H atoms are absorbed in Pd nano-contacts even at the temperature where the thermal process is not expected. The IES time and bias voltage dependences show that H absorption develops by applying bias voltage 30 ˜ 50 mV, which can be explained by quantum tunneling. The results represent that IES is a powerful method to study the kinetics of high density H on solid surface.

  7. Palladium-modified aluminide coatings: Mechanisms of formation

    SciTech Connect

    Lamesle, P.; Steinmetz, P.; Steinmetz, J. [Universite Henri Poincare Nancy, Vandoeuvre (France); Alperine, S. [O.N.E.R.A. Direction Scientifique des Materiaux, Chatillon (France)

    1995-02-01

    The need to increase the efficiency of turbo engines has led manufacturers to increase the temperature of gases at the exhaust of the combustion chamber. Another limiting factor for the lifetime of blades or vanes used in gas turbines is hot corrosion due to the condensation of alkaline sulfate produced by the oxidation of sulfur contained in kerosene or fuels. To overcome these problems, the use of protective coatings has come into general use. A systematic investigation of the influence of Pd-Ni predeposit alloys on the microstructure and composition of aluminum diffusion coatings has been conducted on Ni base superalloys (mainly IN738). Their metallurgical structure has been studied with a special emphasis on the nature of the phases and distribution of the various elements throughout the coating section. A two-layer structure similar to that formed on simple aluminide coatings is observed whatever the type of aluminizing treatment (low and high aluminum activity, pack of vapor-phase coating). The superficial layer is, however, very different from that observed in simple aluminide coatings, since it is constituted with a ternary PdNi aluminide. Palladium concentration profiles, which significantly differ when using low or high activity cements, and the results of a study of the ternary Ni-Pd-Al phase diagram, provide qualitative indications concerning the coatings` growth processes. Palladium, if present at a sufficient level, enhances Al diffusion in the beta phase. In the case of low activity processes, a consequence of this increase of Al diffusion flux is the location of an NiAl reaction zone inside the coating.

  8. Selective hydrogenation of phenylacetylene on pumice-supported palladium catalysts

    SciTech Connect

    Duca, D; Liotta, L.F.; Deganello, G. [Universita di Palermo (Italy)] [Universita di Palermo (Italy)

    1995-06-01

    The liquid phase, selective hydrogenation of phenylacetylene on pumice-supported palladium catalysts has been studied for a large range of metallic dispersions (14% {le} D{sub x} {le} 62%). The kinetics were analyzed by a five-parameter mathematical model. The mechanism was determined by the contribution of three basic routes involving only surface species in the rate-determining steps. The hydrogenation of phenylacetylene to styrene is {open_quotes}structure insensitive{close_quotes}. The disappearance rate constant of styrene produced from phenylacetylene is slightly lower than that of phenylacetylene and does not change in the case of the direct hydrogenation of styrene on the same Pd/pumice catalyst. However, Q{sub 3} (the ratio of adsorption constants K{sub Eb}/K{sub St}, where Eb is ethylbenzene and St is styrene), which is typical of a zero-order reaction (Q{sub 3}{r_arrow}0) in the case of the direct hydrogenation, is practically constant (Q{sub 3}{approx_equal}2) in the case of dehydrogenation of styrene produced from phenylacetylene. This is explained by the formation, in the latter case, of polymeric species or other species which are difficult to hydrogenate and by the consequent occupation of active sites so that the adsorption of styrene is inhibited. These species are also thought to be responsible for a flattening effect in the catalytic activity. Activity and selectivity data are critically analyzed and compared with those reported for other supported palladium catalysts. Since Pd/pumice catalysts also show high activity and selectivity at high metal dispersions, they could be of interest for industrial applications. 48 refs., 9 figs., 3 tabs.

  9. Cleanup Verification Package for the118-F-2 Burial Ground

    SciTech Connect

    J. M. Capron and K. A. Anselm

    2008-02-21

    This cleanup verification package documents completion of remedial action, sampling activities, and compliance with cleanup criteria for the 118-F-2 Burial Ground. This burial ground, formerly called Solid Waste Burial Ground No. 1, was the original solid waste disposal site for the 100-F Area. Eight trenches contained miscellaneous solid waste from the 105-F Reactor and one trench contained solid waste from the biology facilities.

  10. STS-118 Astronaut Dave Williams Trains Using Virtual Reality Hardware

    NASA Technical Reports Server (NTRS)

    2007-01-01

    STS-118 astronaut and mission specialist Dafydd R. 'Dave' Williams, representing the Canadian Space Agency, uses Virtual Reality Hardware in the Space Vehicle Mock Up Facility at the Johnson Space Center to rehearse some of his duties for the upcoming mission. This type of virtual reality training allows the astronauts to wear special gloves and other gear while looking at a computer that displays simulating actual movements around the various locations on the station hardware which with they will be working.

  11. Palladium-catalyzed C-N cross-coupling and application to the synthesis of delayed singlet emitters for OLED development

    E-print Network

    Su, Mingjuan

    2014-01-01

    The studies in the present dissertation were aimed at developing and applying synthetic methods mediated by palladium catalysis. In Chapters 1 and 2, the palladium-catalyzed amidation and amination of five-membered ...

  12. Novel Volatile Precursors of Palladium For ALD and CVD Deo V. Shenai,1 Qing Min Wang,1 Jean-Sbastien Lehn,1 and Roy G. Gordon2

    E-print Network

    Heteroleptic Palladium Amidinate (Pd-1) and Formamidinate (Pd-2) containing strategic alkenyl ligand: · Both Pd labile with slow degradation at > 60oC · New heteroleptic and homoleptic palladium sources (Pd-1, Pd-2Accelerated Rate Calorimetry (ARC) Study on Pd-3 Conclusions Heteroleptic Palladium Amidinate and Formamidinate (Pd

  13. Palladium-catalyzed hydroarylation of 1,3-dienes with boronic esters via reductive formation of pi-allyl palladium intermediates under oxidative conditions.

    PubMed

    Liao, Longyan; Sigman, Matthew S

    2010-08-01

    A palladium-catalyzed reductive cross-coupling of 1,3-dienes with boronic esters in which a pi-allyl Pd species is generated directly from a 1,3-diene via a Pd-catalyzed aerobic alcohol oxidation is reported. Both the scope of the process and the origin of a highly selective 1,2-addition are discussed. PMID:20608751

  14. Antiplasmodial activity of eco-friendly synthesized palladium nanoparticles using Eclipta prostrata extract against Plasmodium berghei in Swiss albino mice.

    PubMed

    Rajakumar, Govindasamy; Rahuman, Abdul Abdul; Chung, Ill-Min; Kirthi, Arivarasan Vishnu; Marimuthu, Sampath; Anbarasan, Karunanithi

    2015-04-01

    Malaria is an infectious disease caused by the Plasmodium parasite that continues to be a health issue for humans. It is one of the most common pathogenic factors of morbidity and mortality. Palladium nanoparticles (Pd NPs) have been used as target antimicrobial compounds, as a catalyst to manufacture pharmaceuticals, degrade harmful environmental pollutants, and as sensors for the detection of various analyses. The aim of this study was to investigate the antiplasmodial activity of synthesized Pd NPs by using leaf aqueous extract of Eclipta prostrata against Plasmodium berghei in Swiss albino mice. The synthesized Pd NPs were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy (SEM) with Energy dispersive X-ray spectroscopy (EDX), and High-resolution transmission electron microscope (HRTEM) with the Selected area (electron) diffraction (SAED). The XRD peaks appeared at 35.61°, 44.27°, 56.40°, and 74.51°, which correspond to (111), (200), (220), and (311) planes for palladium, respectively. The FTIR spectra that were carried out to identify the potential biomolecule of synthesized Pd NPs showed the peaks at 3361, 1540, 1399, 1257, 1049, and 659 in the region of 4000-500 cm(-1). The SEM images showed aggregation of NPs with an average size of 63?±?1.4. The HRTEM images of the precipitated solid phase obtained after termination of the reaction of E. prostrata aqueous leaf extract were in the range from 18 to 64 nm with an average size of 27?±?1.3 nm. The in vivo antiplasmodial assay was carried out as per Peters' 4-day suppressive test, and the synthesized Pd NP-treated mice group showed reduction of parasitemia by 78.13% with an inhibitory concentration (IC)50 value of 16.44 mg/kg/body weight. The growth inhibition of E. prostrata aqueous leaf extract, palladium acetate, and synthesized Pd NPs showed the IC20, IC50, and IC90 values of 1.90, 10.29, and 64.11; 4.49, 9.84, and 23.04; and 4.34, 8.70, and 18.49 mg/kg/body weight, respectively against NK65 strain of P. berghei. In vitro cytotoxicity of the aqueous leaf extract of E. prostrata, palladium acetate, and Pd NPs that was evaluated against Hep-G2 cell lines showed the cellular toxicity of 7.5, 12, 22, 32, and 39%; 8.2, 18, 32, 55, and 66.2 %; and 8.5, 24, 48, 65, and 76.5% at 1, 10, 100, 250, and 500 ?g/mL, respectively. This green chemistry approach toward the synthesis of Pd NPs has many advantages such as, ease with which the process can be scaled up, and economic viability. PMID:25653029

  15. High-Spin States in PALLADIUM-107, PALLADIUM-108 and SILVER-109.

    NASA Astrophysics Data System (ADS)

    Pohl, Kenneth R.

    1995-01-01

    High-spin states in ^{107,108 }Pd and ^{109}Ag have been studied by charged-particle-gamma , gamma-gamma , and charged-particle-gamma -gamma coincidence measurements of heavy-ion fusion-evaporation reactions. Charged-particle -gamma measurements of gamma -ray spectra, angular distributions, and excitation functions were performed using an ^{18 }O beam with an enriched ^{96 }Zr target at beam energies of 56, 63, 72, and 80 MeV. Background measurements were performed using a ^{rm nat}Zr target. Charged -particle-gamma-gamma measurements using the same reaction at beam energies of 70 and 60 MeV were used to measure gamma -gamma coincidences, coincidence intensities, and gated angular distributions. A gamma-gamma measurement using the reaction ^{100}Mo( ^{13}C,p3n)^ {109}Ag at E_{BEAM } = 65 MeV was performed to measure a low-energy transition in ^{109}Ag. Partial level schemes of ^{107,108 }Pd and ^{109}Ag were constructed from the gamma- gamma coincidence measurements. These levels schemes significantly extend the known high-spin decay patterns of ^{107}Pd and ^{108}Pd. The ^{109}Ag results represent the first measurement of high-spin states in that nuclide. New collective bands have been discovered in all three nuclides. The principal bands in each exhibit the general property of back-bends corresponding to the rotational alignment of a pair of h_{11over2 } quasi-neutrons. Rotational alignments and Routhians have been compared to predictions of the cranked shell model and total Routhian surface calculations. Transition properties in ^{107}Pd and ^{109}Ag have been compared to predictions of a geometrical model in the context of the cranked shell model.

  16. 2550 J. Org. Chem. 1983,48, 2550-2555 Reductive Elimination of Vicinal Oxygen Functions with Palladium(0).

    E-print Network

    Keinan, Ehud

    with Palladium(0). Applications in the Withanolide Series Ehud Keinan* and Mahendra Sahai Department of Organic approach to the steroidal 6@-hydroxy2,4-dien-l-one system is described by starting from the 4@-acetoxy-S&6 A into jaborosalactone. The transformation involves a palladium-mediated reductive elimination of two vicinal oxygen

  17. Palladium-Catalyzed Enantioselective Cyclization of Silyloxy-1,6-Enynes Britton K. Corkey and F. Dean Toste*

    E-print Network

    Toste, Dean

    Palladium-Catalyzed Enantioselective Cyclization of Silyloxy-1,6-Enynes Britton K. Corkey and F employed in the preparation of enantioenriched 1,4-diene containing structures.2-4 Despite its potential silyloxy-substituted olefins. On the basis of our recent report on palladium-catalyzed enantio- selective 5

  18. Application of Imidazolylazo Resin : Separation of Palladium(II), Silver(I) from Synthetic Mixtures, Medicinal and Geological Samples

    Microsoft Academic Search

    Debasis Das; Arabinda K. Das; Chittaranjan Sinha

    1999-01-01

    A resin (I) containing imidazolylazo functional group has been used for the separation and preconcentration of palladium(II) and silver(I) from other metal ions in synthetic mixture, ores, alloys and medicinal samples. No interference could be observed from alkali and alkaline earth metal. Palladium(II) is quantitatively separated from ores and platinum wire without interferences.

  19. Some remarks on the neutron elastic- and enelastic-scattering cross sections of palladium

    SciTech Connect

    Chiba, S.; Guenther, P.T.; Smith, A.B.

    1989-05-01

    The cross sections for the elastic-scattering of 5.9, 7.1 and 8.0 MeV neutrons from elemental palladium were measured at forty scattering angles distributed between approx.15/degree/ and 160/degree/. The inelastic-scattering cross sections for the excitation of palladium levels at energies of 260 keV to 560 keV were measured with high resolution at the same energies, and at a scattering angle of 80/degree/. The experimental results were combined with lower-energy values previously obtained by this group to provide a comprehensive data base extending from near the inelastic-scattering threshold to 8 MeV. That data base was interpreted in terms of a coupled-channel model, including the inelastic excitation of one- and two-phonon vibrational levels of the even isotopes of palladium. It was concluded that the palladium inelastic-scattering cross section, at the low energies of interest in assessment of fast-fission-reactor performance, are large (approx.50% greater than given in widely used evaluated fission-product data files). They primarily involve compound-nucleus processes, with only a small direct-reaction component attributable to the excitation of the one-phonon, 2/sup +/, vibrational levels of the even isotopes of palladium. 24 refs., 6 figs.

  20. Dynamic structural evolution of supported palladium-ceria core-shell catalysts revealed by in situ electron microscopy.

    PubMed

    Zhang, Shuyi; Chen, Chen; Cargnello, Matteo; Fornasiero, Paolo; Gorte, Raymond J; Graham, George W; Pan, Xiaoqing

    2015-01-01

    The exceptional activity for methane combustion of modular palladium-ceria core-shell subunits on silicon-functionalized alumina that was recently reported has created renewed interest in the potential of core-shell structures as catalysts. Here we report on our use of advanced ex situ and in situ electron microscopy with atomic resolution to show that the modular palladium-ceria core-shell subunits undergo structural evolution over a wide temperature range. In situ observations performed in an atmospheric gas cell within this temperature range provide real-time evidence that the palladium and ceria nanoparticle constituents of the palladium-ceria core-shell participate in a dynamical process that leads to the formation of an unanticipated structure comprised of an intimate mixture of palladium, cerium, silicon and oxygen, with very high dispersion. This finding may open new perspectives about the origin of the activity of this catalyst. PMID:26160065

  1. Synthesis of naturally occurring pyridine alkaloids via palladium-catalyzed coupling/migration chemistry.

    PubMed

    Wang, Yao; Dong, Xiaoyang; Larock, Richard C

    2003-04-18

    The palladium-catalyzed cross-coupling of 3-iodopyridine, long-chain terminal dienes, and benzylic amines or tosylamides provides a novel route to key intermediates for the synthesis of the naturally occurring, biologically active pyridine alkaloids theonelladins C and D, niphatesine C, and xestamine D. This process involves (1) oxidative addition of the heterocyclic iodide to Pd(0), (2) carbopalladation of the least hindered carbon-carbon double bond of the diene, (3) palladium migration, and (4) pi-allylpalladium displacement by the nitrogen nucleophile with simultaneous regeneration of the Pd catalyst. Subsequent hydrogenation and deprotection affords good yields of the natural products. The Pd-catalyzed coupling of 3-iodopyridine and 2-methyl-11-dodecen-1-ol provides a convenient synthesis of a long-chain aldehyde by an analogous palladium migration process, which is easily converted to the pyridine alkaloid ikimine A. PMID:12688777

  2. Gold–promoted structurally ordered intermetallic palladium cobalt nanoparticles for the oxygen reduction reaction

    DOE PAGESBeta

    Kuttiyiel, Kurian A.; Sasaki, Kotaro; Su, Dong; Wu, Lijun; Zhu, Yimei; Adzic, Radoslav R.

    2014-11-06

    Considerable efforts to make palladium and palladium alloys active catalysts and a possible replacement for platinum have had a marginal success. Here, we report on a structurally ordered Au??Pd??Co?? catalyst that exhibits comparable activity to conventional platinum catalysts in both acid and alkaline media. Electron microscopic techniques demonstrate that via addition of gold atoms PdCo nanoparticles undergo at elevated temperatures an atomic structural transition from core-shell to a rare intermetallic ordered structure with twin boundaries forming stable {111}, {110} and {100} facets. The superior stability of this catalyst compared to platinum after 10,000 potential cycles in alkaline media is attributedmore »to the atomic structural order of PdCo nanoparticles along with protective effect of clusters of gold atoms on the surface. This strategy of making ordered palladium intermetallic alloy nanoparticles can be used in diverse heterogeneous catalysis where particle size and structural stability matters.« less

  3. Hydrogen gas sensing with networks of ultra-small palladium nanowires formed on filtration membranes.

    SciTech Connect

    Zeng, X. Q.; Latimer, M. L.; Xiao, Z. L.; Panuganti, S.; Welp, U.; Kwok, W. K.; Xu, T. (Materials Science Division); (Northern Illinois Univ.)

    2010-11-29

    Hydrogen sensors based on single Pd nanowires show promising results in speed, sensitivity, and ultralow power consumption. The utilization of single Pd nanowires, however, face challenges in nanofabrication, manipulation, and achieving ultrasmall transverse dimensions. We report on hydrogen sensors that take advantage of single palladium nanowires in high speed and sensitivity and that can be fabricated conveniently. The sensors are based on networks of ultrasmall (<10 nm) palladium nanowires deposited onto commercially available filtration membranes. We investigated the sensitivities and response times of these sensors as a function of the thickness of the nanowires and also compared them with a continuous reference film. The superior performance of the ultrasmall Pd nanowire network based sensors demonstrates the novelty of our fabrication approach, which can be directly applied to palladium alloy and other hydrogen sensing materials.

  4. Hydrogen gas sensing with networks of ultrasmall palladium nanowires formed on filtration membranes.

    PubMed

    Zeng, X Q; Latimer, M L; Xiao, Z L; Panuganti, S; Welp, U; Kwok, W K; Xu, T

    2011-01-12

    Hydrogen sensors based on single Pd nanowires show promising results in speed, sensitivity, and ultralow power consumption. The utilization of single Pd nanowires, however, face challenges in nanofabrication, manipulation, and achieving ultrasmall transverse dimensions. We report on hydrogen sensors that take advantage of single palladium nanowires in high speed and sensitivity and that can be fabricated conveniently. The sensors are based on networks of ultrasmall (<10 nm) palladium nanowires deposited onto commercially available filtration membranes. We investigated the sensitivities and response times of these sensors as a function of the thickness of the nanowires and also compared them with a continuous reference film. The superior performance of the ultrasmall Pd nanowire network based sensors demonstrates the novelty of our fabrication approach, which can be directly applied to palladium alloy and other hydrogen sensing materials. PMID:21114299

  5. Gold–promoted structurally ordered intermetallic palladium cobalt nanoparticles for the oxygen reduction reaction

    DOE PAGESBeta

    Kuttiyiel, Kurian A. [Brookhaven National Lab. (BNL), Upton, NY (United States); Sasaki, Kotaro [Brookhaven National Lab. (BNL), Upton, NY (United States); Su, Dong [Brookhaven National Lab. (BNL), Upton, NY (United States); Wu, Lijun [Brookhaven National Lab. (BNL), Upton, NY (United States); Zhu, Yimei [Brookhaven National Lab. (BNL), Upton, NY (United States); Adzic, Radoslav R. [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2014-11-06

    Considerable efforts to make palladium and palladium alloys active catalysts and a possible replacement for platinum have had a marginal success. Here, we report on a structurally ordered Au??Pd??Co?? catalyst that exhibits comparable activity to conventional platinum catalysts in both acid and alkaline media. Electron microscopic techniques demonstrate that via addition of gold atoms PdCo nanoparticles undergo at elevated temperatures an atomic structural transition from core-shell to a rare intermetallic ordered structure with twin boundaries forming stable {111}, {110} and {100} facets. The superior stability of this catalyst compared to platinum after 10,000 potential cycles in alkaline media is attributed to the atomic structural order of PdCo nanoparticles along with protective effect of clusters of gold atoms on the surface. This strategy of making ordered palladium intermetallic alloy nanoparticles can be used in diverse heterogeneous catalysis where particle size and structural stability matters.

  6. Long-term study of palladium in road tunnel dust and sewage sludge ash.

    PubMed

    Leopold, K; Maier, M; Weber, S; Schuster, M

    2008-11-01

    The present work summarizes data about palladium contents of road tunnel dust from 1994 to 2007 and sewage sludge ash from 1972 to 2006. Since palladium is emitted from automotive catalytic converters as elemental particles, road dust is quiet useful to study traffic-related Pd emissions. Very high Pd values of up to 516 microg Pd kg(-1) were found in the road dust samples collected in 2007. Heavy metals of all urban emissions, also dental practice effluent, are enriched in sewage sludge ash and thus this matrix is useful for the documentation of palladium emission caused by the use of Pd alloys in dental medicine. In sewage sludge ash highest Pd contents of maximum 460 microg Pd kg(-1) were found in the years 1986-1997. In both matrices correlations of Pd content to Pd demand of industry are discussed. PMID:18355951

  7. Subnanometer Palladium Particles Synthesized by Atomic Layer Deposition

    SciTech Connect

    Feng, Hao P. [Argonne National Lab. (ANL), Argonne, IL (United States); Libera, Joseph A. [Argonne National Lab. (ANL), Argonne, IL (United States); Stair, Peter C. [Northwestern Univ., Evanston, IL (United States); Miller, Jeffrey T. [Argonne National Lab. (ANL), Argonne, IL (United States); Elam, Jeffrey W. [Argonne National Lab. (ANL), Argonne, IL (United States)

    2011-06-03

    Monodispersed palladium nanoparticle catalysts were synthesized by atomic layer deposition (ALD) using alternating exposures of Pd hexafluoroacetylacetonate (Pd(hfac)?) and formalin on an alumina support. The size of the ALD Pd particles could be tuned by adjusting the preparation conditions. Conventional ALD conditions produced Pd particles with an average size of 1.4 nm. Removal of surface hydroxyls from the alumina support by a chemical treatment using trimethyl aluminum (TMA) before performing Pd ALD led to nanoparticles larger than 2 nm. Ultrasmall (subnanometer) Pd particles were synthesized using low-temperature metal precursor exposures, followed by applying protective ALD alumina overcoats. The ALD Pd particles were characterized by transmission electron microscopy, extended X-ray absorption fine structure, and diffuse reflectance infrared Fourier transform spectroscopy techniques. The Pd loadings were measured by X-ray fluorescence. The catalytic performance of ALD Pd particles of different sizes was compared in the methanol decomposition reaction. The specific activity (normalized by Pd loading) of the ultrasmall Pd particles was higher than those of the larger particles. Considering the metal dispersion factor, the turnover frequency (TOF) of the ultrasmall Pd particles is comparable to that of the medium-sized (1.4 nm, on average) Pd particles synthesized under standard ALD conditions. The large Pd particles (>2 nm) are a factor of 2 less active than the smaller Pd particles.

  8. Palladium-catalyzed thiocarbonylation of aryl, vinyl, and benzyl bromides.

    PubMed

    Burhardt, Mia N; Ahlburg, Andreas; Skrydstrup, Troels

    2014-12-19

    A catalytic protocol for synthesis of thioesters from aryl, vinyl, and benzyl bromides as well as benzyl chlorides was developed using only stoichiometric amounts of carbon monoxide, produced from a solid CO precursor inside a two-chamber system. As a catalytic system, the combination of bis(benzonitrile) palladium(II) chloride and Xantphos furnished the highest yields of the desired compounds, along with the weak base, NaOAc, in anisole at 120 °C. The choice of catalytic system as well as solvent turned out to be important in order to ensure a high chemoselectivity in the reaction. Both electron-rich and electron-deficient aryl bromides worked well in this reaction. Addition of 1 equiv of sodium iodide to the reaction improved the chemoselectivity with the electron-deficient aryl bromides. The thiol scope included both aryl and alkyl thiols, including 2-mercaptobenzophenones, whereby a thiocarbonylation followed by a subsequent McMurry coupling yielded differently substituted benzothiophenes. It was demonstrated that the methodology could be applied for (13)C introduction into the thiophene ring. PMID:24919457

  9. Mild palladium-catalyzed selective monoarylation of nitriles.

    PubMed

    Wu, Lingyun; Hartwig, John F

    2005-11-16

    Two new palladium-catalyzed procedures for the arylation of nitriles under less basic conditions than previously reported have been developed. The selective monoarylation of acetonitrile and primary nitriles has been achieved using alpha-silyl nitriles in the presence of ZnF2. This procedure is compatible with a variety of functional groups, including cyano, keto, nitro, and ester groups, on the aryl bromide. The arylation of secondary nitriles occurred in high yield by conducting reactions with zinc cyanoalkyl reagents. These reaction conditions tolerated base-sensitive functional groups, such as ketones and esters. The combination of these two methods, one with alpha-silyl nitriles and one with zinc cyanoalkyl reagents, provides a catalytic route to a variety of benzylic nitriles, which have not only biological significance but utility as synthetic intermediates. The utility of these new coupling reactions has been demonstrated by a synthesis of verapamil, a clinically used drug for the treatment of heart disease, by a three-step route from commercial materials that allows convenient variation of the aryl group. PMID:16277525

  10. Catalytic hydrolysis of ammonia borane via cobalt palladium nanoparticles.

    PubMed

    Sun, Daohua; Mazumder, Vismadeb; Metin, Önder; Sun, Shouheng

    2011-08-23

    Monodisperse 8 nm CoPd nanoparticles (NPs) with controlled compositions were synthesized by the reduction of cobalt acetylacetonate and palladium bromide in the presence of oleylamine and trioctylphosphine. These NPs were active catalysts for hydrogen generation from the hydrolysis of ammonia borane (AB), and their activities were composition dependent. Among the 8 nm CoPd catalysts tested for the hydrolysis of AB, the Co(35)Pd(65) NPs exhibited the highest catalytic activity and durability. Their hydrolysis completion time and activation energy were 5.5 min and 27.5 kJ mol(-1), respectively, which were comparable to the best Pt-based catalyst reported. The catalytic performance of the CoPd/C could be further enhanced by a preannealing treatment at 300 °C under air for 15 h with the hydrolysis completion time reduced to 3.5 min. This high catalytic performance of Co(35)Pd(65) NP catalyst makes it an exciting alternative in pursuit of practical implementation of AB as a hydrogen storage material for fuel cell applications. PMID:21766875

  11. Analysis of Central Events in the Interactions of Relativistic Heavy Ions with Emulsion Nuclei at 118.4 GeV

    SciTech Connect

    EL-Falaky, E. [Physics Department, Faculty of Education, Suez Canal University, El-Suez (Egypt)

    2007-02-14

    Data on the multiplicity of the secondary produced particles in the central events from the interactions of 32S with AgBr nuclei at 118.4 GeV. A different selection criteria of the central collision in heavy ion interactions was investigated. The multiplicity distributions of the different produced shower particles (mainly pions) in the central events for each criteria was studied. The multiplicity distributions of the target fragments emitted in the central events was fitted by a Gaussian distribution. The target analysis of the experimental data shows agreement with the limiting fragmentation hypothesis.

  12. Reduced HRASG12V-Driven Tumorigenesis of Cell Lines Expressing KRASC118S

    PubMed Central

    Huang, Lu; Counter, Christopher M.

    2015-01-01

    In many different human cancers, one of the HRAS, NRAS, or KRAS genes in the RAS family of small GTPases acquires an oncogenic mutation that renders the encoded protein constitutively GTP-bound and thereby active, which is well established to promote tumorigenesis. In addition to oncogenic mutations, accumulating evidence suggests that the wild-type isoforms may also be activated and contribute to oncogenic RAS-driven tumorigenesis. In this regard, redox-dependent reactions with cysteine 118 (C118) have been found to promote activation of wild-type HRAS and NRAS. We sought to determine if this residue is also important for the activation of wild-type KRAS and promotion of tumorigenesis. Thus, we mutated C118 to serine (C118S) in wild-type KRAS to block redox-dependent reactions at this site. We now report that this mutation reduced the level of GTP-bound KRAS and impaired RAS signaling stimulated by the growth factor EGF. With regards to tumorigenesis, we also report that oncogenic HRAS-transformed human cells in which endogenous KRAS was knocked down and replaced with KRASC118S exhibited reduced xenograft tumor growth, as did oncogenic HRAS-transformed KrasC118S/C118S murine cells in which the C118S mutation was knocked into the endogenous Kras gene. Taken together, these data suggest a role for redox-dependent activation of wild-type KRAS through C118 in oncogenic HRAS-driven tumorigenesis. PMID:25902334

  13. Linkage isomerism in palladium(II)-chloranilate complexes. Synthesis and mechanistic studies of bis(acetonitrile)(chloranilato)palladium(II) and bis(triphenylphosphine)(chloranilato)palladium(II)

    SciTech Connect

    Wooyeong Jeong; Holwerda, R.A.

    1988-07-27

    Structural and mechanistic studies are reported of a linkage isomerization process in which the bidentate ligand 2,5-dioxo-3,6-dichloro-1,4-benzoquinone (chloranilate dianion, CA/sup 2/minus//) rearranges to a /pi/-complexed diene (/pi/-CA/sup 2/minus//) from an unusual bis(carbanion) resonance form (C-CA/sup 2/minus//) upon the substitution of acetonitrile by triphenylphosphine in the first coordination sphere of palladium(II). Yellow (Pd(C-CA)(CH/sub 3/CN)/sub 2/) may be prepared in excellent yield from the reaction of K/sub 2/Pd(C-CA)Cl/sub 2/ with AgNO/sub 3/ in acetonitrile solution and combines readily with triphenylphosphine to give purpose (Pd(/pi/-CA)(PPh/sub 3/)/sub 2/). Pd(II)-chloranilate complexes were structurally characterized through NMR (/sup 13/C and /sup 31/P), uv-visible, and infrared spectra. Stopped-flow kinetic studies of the (Pd(C-CA)(CH/sub 3/CN)/sub 2/) transformation to (Pd(/pi/-CA)(PPh/sub 3/)/sub 2/) in acetonitrile solution demonstrate that rate-limiting linkage isomerization (rate constant k/sub i/) follows rapid, preequilibrium formation of (Pd(C-CA)(PPh/sub 3/)/sub 2/) (stepwise formation constants K/sub 1/ and K/sub 2/). At 25.0/degree/C, K/sub 2/ = 2.47 /times/ 10/sub 2/ M/sup /minus/1/ and k/sub i/ = 8.44 /times/ 10/sup /minus/2/ s/sup /minus/1/. Kinetic temperature dependence results gave the activation parameters that govern k/sub i/ (/Delta/H/double dagger/ = 17.1 kcal/mol; /Delta/S/double dagger/ = /minus/6 eu) and standard enthalpy/entropy changes corresponding to K/sub 2/ (/Delta/H/degree/ = /minus/14.0 kcal/mol; /Delta/S/degree/ = /minus/36 eu). The exceptionally high enthalpic activation barrier to linkage isomerization reflects the considerable stability of the five-membered, bis(carbanion) chelate ring in (Pd(C-CA)(CH/sub 3/CN)/sub 2/). 30 references, 4 figures, 2 tables.

  14. Palladium(II) catalyzed intramolecular oxidation of conjugated kienes forming carbon-carbon bonds

    SciTech Connect

    Gatti, R.G.P.; Nilsson, Y.I.M.; Baeckvall, J.E. [Univ. of Uppsala (Sweden)

    1995-12-31

    As an extension of the earlier developed 1,4-oxidation of conjugated dienes, it would be interesting to investigate the possibility to form carbon-carbon bonds, especially in the creation of cyclic systems (eq.). Stabilized carbon nucleophiles were unsuccessful, but if instead a vinyl palladium is generated via chloropalladation this inserts into the diene to form a carbon-carbon bond. The overall 1,4-oxidation of the vinylic carbon and the chloride across the diene occurs in an anti fashion. A suggested mechanism involve a {pi}-allyl-palladium intermediate.

  15. High temperature silver-palladium-copper oxide air braze filler metal

    NASA Astrophysics Data System (ADS)

    Darsell, Jens Tommy

    The Ag-CuO system is currently being investigated as the basis for an air braze filler metal alloy to be used in SOFC components. The system is of interest because unlike most braze alloys, it is capable of wetting a variety of ceramic materials while being applied in an air. This thesis work examined modification of Ag-CuO filler metal system by alloying with palladium to increase the use temperature of the resulting air braze alloy. Thermal analysis was performed to track changes in the solidus and liquidus temperatures for these alloys and determine equilibrium phase present as a function of temperature and composition. Sessile drop experiments were performed to investigate the effect of palladium addition on braze wetability. The influence of copper-oxide and palladium contents on brazed joint strength was characterized by a combination of four-point bend testing and fractography. From combined thermal analysis and quenched data it was found that both the liquidus and solidus increase with increasing palladium content, and the silver-rich miscibility gap boundary could be shifted by the addition of palladium. This was employed as a tool to study the effects of two-liquid phase formation on wetting behavior. In addition, a mass loss likely attributable to silver volatilization is observed in the Pd-modified filler metals when heated over ˜1100°C. As volatilization should be avoided, the ternary alloys should be limited to 15mol% Pd. It was found by sessile drop wetting experiments that there is a definitive change in wetting behavior that corresponds directly to the miscibility gap boundary for the Pd-Ag-CuO system. The first order transition tracks with changes in the miscibility gap boundary that can be induced by increasing palladium content. This is the first experimental evidence of critical point wetting behavior reported for a metal-oxide system and further confirms that critical point wetting theory is universal. Four-point bend testing and fractography of YSZ-YSZ joints brazed using binary and 5mol% Pd and 15mol% Pd ternary air braze alloys found that the specimens joined using binary Ag-2CuO compositions exhibited the highest average bend strength, 148+/-24MPa. In general increasing additions of palladium appeared to reduce room temperature bend strength. Increases in liquidus and solidus temperatures with palladium additions are expected to improve high temperature strength although this still needs to be verified.

  16. Hydrogen-bond-assisted activation of allylic alcohols for palladium-catalyzed coupling reactions.

    PubMed

    Gumrukcu, Yasemin; de Bruin, Bas; Reek, Joost N H

    2014-03-01

    We report direct activation of allylic alcohols using a hydrogen-bond-assisted palladium catalyst and use this for alkylation and amination reactions. The novel catalyst comprises a palladium complex based on a functionalized monodentate phosphoramidite ligand in combination with urea additives and affords linear alkylated and aminated allylic products selectively. Detailed kinetic analysis show that oxidative addition of the allyl alcohol is the rate-determining step, which is facilitated by hydrogen bonds between the alcohol, the ligand functional group, and the additional urea additive. PMID:24436302

  17. Sorption of palladium(II) from sulfate and perchlorate media on hydrated zirconium dioxide

    SciTech Connect

    Abovskaya, N.V.; Boichinova, E.S.; Simanova, S.A.

    1988-09-20

    Hydrated zirconium dioxide (HZD) is an amphoteric sorbent, acting as an anion-exchanger in acid solutions and a cation-exchanger in alkaline. The purpose of this work was to study the sorption activity of (HZD) with respect to palladium(II) in solutions of PdSO/sub 4/ x 3H/sub 2/O in sulfuric or perchloric acids. It was shown that HZD can extract cationic palladium(II) aqua complexes selectively and rapidly from weakly acidic solutions. The sorbed aqua complexes of Pd(II) undergo conversions with formation of hydroxo complexes in the sorbent phase.

  18. Fabrication of a thin palladium membrane supported in a porous ceramic substrate by chemical vapor deposition

    Microsoft Academic Search

    G. Xomeritakis; Y. S. Lin

    1996-01-01

    A thin, gas-tight palladium (Pd) membrane was prepared by the counter-diffusion chemical vapor deposition (CVD) process employing palladium chloride (PdCl2) vapor and H2 as Pd precursors. A disk-shaped, two-layer porous ceramic membrane consisting of a fine-pore ?-Al2O3 top layer and a coarse-pore ?-Al2O3 substrate was used as Pd membrane support. A 0.5–1 ?m thick metallic membrane was deposited in the

  19. Asymmetric allylation of unsymmetrical 1,3-diketones using a BINAP-palladium catalyst.

    PubMed

    Kuwano, Ryoichi; Uchida, Kei-Ichi; Ito, Yoshihiko

    2003-06-12

    [reaction: see text] The chiral palladium complex generated in situ from [Pd(eta(3)-allyl)Cl](2) and (R)-BINAP is a good catalyst for the catalytic asymmetric allylation of 1,3-diketones. The reaction provided chiral 2,2-dialkyl-1,3-diketones with 64-89% ee in high yields (13 examples). Enantiomeric excesses are strongly affected by the gamma-substituent of the allylic substrates. A variety of unsymmetrical 1,3-diketones were alkylated with cinnamyl acetate in good enantioselectivities via use of the BINAP-palladium catalyst (77-89% ee). PMID:12790558

  20. Experimental Demonstration of Advanced Palladium Membrane Separators for Central High Purity Hydrogen Production

    SciTech Connect

    Sean Emerson; Neal Magdefrau; Susanne Opalka; Ying She; Catherine Thibaud-Erkey; Thoman Vanderspurt; Rhonda Willigan

    2010-06-30

    The overall objectives for this project were to: (1) confirm the high stability and resistance of a PdCu trimetallic alloy to carbon and carbide formation and, in addition, resistance to sulfur, halides, and ammonia; (2) develop a sulfur, halide, and ammonia resistant alloy membrane with a projected hydrogen permeance of 25 m{sup 3}m{sup -2}atm{sup -0.5}h{sup -1} at 400 C and capable of operating at pressures of 12.1 MPa ({approx}120 atm, 1750 psia); and (3) construct and experimentally validate the performance of 0.1 kg/day H{sup 2} PdCu trimetallic alloy membrane separators at feed pressures of 2 MPa (290 psia) in the presence of H{sub 2}S, NH{sub 3}, and HCl. This project successfully increased the technology readiness level of palladium-based metallic membranes for hydrogen separation from coal-biomass gasifier exhaust or similar hydrogen-containing gas streams. The reversible tolerance of palladium-copper (PdCu) alloys was demonstrated for H{sub 2}S concentrations varying from 20 ppmv up to 487 ppmv and NH{sub 3} concentrations up to 9 ppmv. In addition, atomistic modeling validated the resistance of PdCu alloys to carbon formation, irreversible sulfur corrosion, and chlorine attack. The experimental program highlighted two key issues which must be addressed as part of future experimental programs: (1) tube defects and (2) non-membrane materials of construction. Four out of five FCC PdCu separators developed leaks during the course of the experimental program because {approx}10% of the alloy tubes contained a single defect that resulted in a thin, weak point in the tube walls. These defects limited operation of the existing tubes to less than 220 psig. For commercial applications of a PdCu alloy hydrogen separator under high sulfur concentrations, it was determined that stainless steel 316 is not suitable for housing or supporting the device. Testing with sulfur concentrations of 487 {+-} 4 ppmv resulted in severe corrosion of the stainless steel components of the separators. The project identified an experimental methodology for quantifying the impact of gas contaminants on PdCu alloy membrane performance as well as an atomistic modeling approach to screen metal alloys for their resistance to irreversible sulfur corrosion. Initial mathematical descriptions of the effect of species such as CO and H{sub 2}S were developed, but require further experimental work to refine. At the end of the project, an improvement to the experimental approach for acquiring the necessary data for the permeability model was demonstrated in preliminary tests on an enhanced PdCu separator. All of the key DOE 2010 technical targets were met or exceeded except for the hydrogen flux. The highest flux observed for the project, 125 ft{sup 3}ft{sup -2}h{sup -1}, was obtained on a single tube separator with the aforementioned enhanced PdCu separator with a hydrogen feed pressure of 185 psig at 500 C.

  1. Protective overcoatings on thin-film titanium targets for neutron generators

    NASA Astrophysics Data System (ADS)

    Falabella, S.; Tang, V.; Ellsworth, J. L.; Mintz, J. M.

    2014-02-01

    We have developed a thin-film coating for neutron generator targets that can be loaded with deuterium or tritium at low temperatures (100 °C), and at gas/Ti ratios greater than 1.7. The key to this improvement is the addition of a thin palladium overcoat at the end of the titanium deposition. This overcoat prevents the oxidation of the titanium film, yet still allows loading to take place at low temperatures. A palladium overcoat of just 50-100 Å is sufficient to protect the titanium, while presenting a minimal energy loss to incident ions. We have just begun producing targets using this method, and see the possibility of substantial improvement in neutron generator efficiencies.

  2. Electrospray Ionization Mass Spectrometry of Palladium(II) Quinolinylaminophosphonate Complexes

    NASA Astrophysics Data System (ADS)

    Juribaši?, Marina; Bellotto, Lisa; Traldi, Pietro; Tušek-Boži?, Ljerka

    2011-10-01

    The mass spectrometric behavior of palladium(II) halide complexes of three types of quinolinylaminophosphonates, diethyl and dibutyl esters of [?-anilino-(quinolin-2-yl)methyl]phosphonic ( L1, L2), [?-anilino-(quinolin-3-yl)methyl]phosphonic ( L3, L4), and [?-(quinolin-3-ylamino)- N-benzyl]phosphonic acid ( L5, L6), was investigated under positive ion electrospray ionization conditions. Each type of ligand forms complexes with different metal-ligand interactions. Mononuclear dihalide adducts cis-[Pd( L1/ L2)X2] ( 1- 4) and trans-[Pd( L3/ L4)2X2] ( 5- 8) as well as dinuclear tetrahalide complexes [Pd2( L5/ L6)3X4] ( 9- 12) (X = Cl, Br) are formed by metal bonding either through the quinoline or both the quinoline and amino nitrogen atoms. The sodiated molecule [M + Na]+ is observed in the mass spectra of all the complexes, and its abundance as well as the fragmentation pathway depend on the type of the complex. In the cis complexes ( 1- 4) the initial decomposition goes under two fragmentation routes: those in which the sodium molecular adduct sequentially loses halides HX/NaX and those in which this loss is in the competition with the loss of dialkyl phosphite. The predominant pathways for decomposition of trans dihalide ( 5- 8) and tetrahalide ( 9- 12) complexes include three competitive reactions; the loss of halides, dialkyl phosphites and the intact phosphonate ligand molecule and its fragments formed by ester dissociation or complete loss of the phosphonate ester moiety. A series of acetonitrile adducts and cluster ions derived from dimolecular clusters [2M + Na]+ were also detected. The most important fragmentation patterns are rationalized and supported by the MS n studies.

  3. Palladium-chromium static strain gages for high temperatures

    NASA Technical Reports Server (NTRS)

    Lei, Jih-Fen

    1992-01-01

    An electrical resistance strain gage that can provide accurate static strain measurement to a temperature of 1500 F or above is being developed both in fine wire and thin film forms. The gage is designed to be temperature compensated on any substrate material. It has a dual element: the gage element is a special alloy, palladium-13wt percent chromium (PdCr), and the compensator element is platinum (Pt). Earlier results of a PdCr based wire gage indicated that the apparent strain of this gage can be minimized and the repeatability of the apparent strain can be improved by prestabilizing the gage on the substrate for a long period of time. However, this kind of prestabilization is not practical in many applications and therefore the development of a wire gage which is prestabilized before installation on the substrate is desirable. This paper will present our recent progress in the development of a prestabilized wire gage which can provide meaningful strain data for the first thermal cycle. A weldable PdCr gage is also being developed for field testing where conventional flame-spraying installation can not be applied. This weldable gage is narrower than a previously reported gage, thereby allowing the gage to be more resistant to buckling under compressive loads. Some preliminary results of a prestabilized wire gage flame-sprayed directly on IN100, an engine material, and a weldable gage spot-welded on IN100 and SCS-6/(beta)21-S Titanium Matrix Composite (TMC), a National Aero-Space Plane (NASP) structure material, will be reported. Progress on the development of a weldable thin film gage will also be addressed. The measurement technique and procedures and the lead wire effect will be discussed.

  4. Palladium catalysts synthesized by atomic layer deposition for methanol decomposition.

    SciTech Connect

    Elam, J. W.; Feng, H.; Stair, P. C.; Libera, J. A.; Setthapun, W.; Northwestern Univ.

    2010-05-25

    Atomic layer deposition (ALD) palladium films were deposited at 200 C on various ALD metal oxide surfaces using sequential exposures to Pd(II) hexafluoroacetylacetonate (Pd(hfac)2) and formalin. In situ quartz crystal microbalance measurements as well as ex situ measurements performed on planar substrates revealed that the Pd growth begins with a relatively slow nucleation process and accelerates once an adequate amount of Pd has deposited on the surface. Furthermore, the Pd nucleation is faster on ALD ZnO surfaces compared to ALD Al2O3 surfaces. ALD was utilized to synthesize highly dispersed, uniform Pd nanoparticles (1 to 2 nm in diameter) on ALD ZnO and Al2O3 coated mesoporous silica gel, and the catalytic performances of these samples were compared in the methanol decomposition reaction. The ALD Pd-Al2O3 showed high activity and hydrogen selectivity at relatively low temperatures while the ALD Pd-ZnO showed very low activity as well as quick deactivation. In situ extended X-ray absorption fine structure (EXAFS) measurement revealed that the Pd supported on ZnO 'dissolves' into the substrate during the methanol decomposition reaction which accounts for the gradual disappearance of its catalytic activity. By applying one cycle of ALD Al2O3 on top of the Pd-ZnO catalyst, the activity was enhanced and the catalyst deactivation was mitigated. This Al2O3 overcoating method stabilizes the Pd-ZnO and effectively prevents the dissolution of Pd into the ZnO substrate.

  5. The influence of ethylenediamine tetra acetic acid (EDTA) on the transformation and solubility of metallic palladium and palladium(II) oxide in the environment.

    PubMed

    Zereini, Fathi; Wiseman, Clare L S; Vang, My; Albers, Peter; Schneider, Wolfgang; Schindl, Roland; Leopold, Kerstin

    2015-05-01

    The environmental occurrence of elevated concentrations of platinum (Pt), palladium (Pd) and rhodium (Rh) from automotive catalytic converters has been well-documented. Limited information exists regarding their chemical behavior post-emission, however, especially in the presence of commonly occurring complexing agents. The purpose of this study is to examine the influence of ethylenediamine tetra acetic acid (EDTA) on the possible environmental transformation and solubility of Pd by conducting batch experiments using metallic palladium (Pd black) and palladium(ii) oxide (PdO). Changes in the particle surface chemistry of treated samples were analyzed using X-ray Photoelectron Spectroscopy (XPS) and Transition Electron Microscopy/Energy Dispersive X-ray Spectrometry (TEM/EDX) techniques. Metallic palladium was partially transformed into PdOx (x < 1), while PdO remained largely unaffected. The pH of EDTA solutions was observed to modulate Pd solubility, with Pd black demonstrating a higher solubility compared to PdO. Solubility was also found to increase with a corresponding increase in the strength of EDTA solution concentrations, as well as with the length of extraction time. The overall solubility of Pd remained relatively low for most samples (<1 wt%). A dissolution rate of 2.01 ± 0.17 nmol m(-2) h(-1) was calculated for Pd black in 0.1 M EDTA (pH 7). In contrast to previously held assumptions about the environmental immobility of Pd, small amounts of this element emitted in metallic form are likely to be soluble in the presence of complexing agents such as EDTA. PMID:25816200

  6. Production of Palladium-Silver Thin Film Alloys and Measurements of Phase Diagrams of the PALLADIUM(1-X)SILVER(X)HYDROGEN System.

    NASA Astrophysics Data System (ADS)

    Villalobos-Velasco, Jaime

    1988-06-01

    PdAg Alloy thin films of different compositions were fabricated by crosscondensation of two atomic fluxes on temperature controlled quartz crystal substrates. The fluxes were generated by thermal evaporation of pure materials produced by two electron-beam-guns (e-guns). The process took place under clean high vacuum conditions. Film thickness, growth rate and composition were precisely computer-controlled utilizing three quartz crystal mass monitors (QCM) and a combination of shutters. Criteria for quality of the films were accuracy and homogeneity of thickness and alloy composition. Hydrogen pressure and temperature were carefully controlled for the performance of the hydrogen cycling process in order to study the interaction of hydrogen with the metal alloy thin film structures. All process variables were automatically monitored and controlled to eliminate inaccuracies inherent in manual control. Software and hardware were developed for repeatability of the process parameters and variables to ensure reproduction of the evaporation and hydrogen-cycling processes. Phase diagrams consisting of pressure concentration relations from repeated hydrogen cycling processes were measured using the QCM technique. Results on palladium hydride obtained using the volumetric technique were combined with results from the QCM on similar systems for the development of an empirical method to extract the stress effect inherent in the QCM produced by the expansion of the volume of the palladium host lattice upon hydrogen adsorption. As a consequence bulk behavior of the phase diagrams for thin films thicker than 2500 A were predicted. The results describe the evolution of the phase diagrams of palladium thin films as their thicknesses approach bulk. The evolution of features of the phase diagrams as the incorporation of silver in the palladium host structure changes from 0 to 30% is also described. A reduction of the hydrogen solubility of the PdAg structure occurs as the silver composition increases. These results are in good agreement with bulk results done by others.

  7. 21 CFR 118.6 - Egg testing for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Egg testing for Salmonella Enteritidis (SE). 118.6 Section...SHELL EGGS § 118.6 Egg testing for Salmonella Enteritidis (SE). (a...achieve at least a 5-log destruction of Salmonella Enteritidis or processed as egg...

  8. 21 CFR 118.6 - Egg testing for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Egg testing for Salmonella Enteritidis (SE). 118.6 Section...SHELL EGGS § 118.6 Egg testing for Salmonella Enteritidis (SE). (a...achieve at least a 5-log destruction of Salmonella Enteritidis or processed as egg...

  9. 21 CFR 118.6 - Egg testing for Salmonella Enteritidis (SE).

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Egg testing for Salmonella Enteritidis (SE). 118.6 Section...SHELL EGGS § 118.6 Egg testing for Salmonella Enteritidis (SE). (a...achieve at least a 5-log destruction of Salmonella Enteritidis or processed as egg...

  10. 20 CFR 703.118 - Agreement to be bound by report.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Agreement to be bound by report. 703.118 Section 703...Carriers § 703.118 Agreement to be bound by report. Every applicant...the carrier's agreement to become so bound. It shall be no defense to this...

  11. INDEX TO VOLUME 118 This index provides coverage for both the Initial Reports and Scientific Results

    E-print Network

    INDEX TO VOLUME 118 This index provides coverage for both the Initial Reports and Scientific Results portions of Volume 118 of the Proceedings of the Ocean Drilling Program. Index entries (this book). The index usually is presented in three parts: (1) a Subject Index, (2) a Site Index

  12. 26 CFR 1.118-2 - Contribution in aid of construction.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...2012-04-01 false Contribution in aid of construction. 1.118-2 Section...Income § 1.118-2 Contribution in aid of construction. (a) Special rule... (i) The amount is a contribution in aid of construction under paragraph (b)...

  13. 26 CFR 1.118-2 - Contribution in aid of construction.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...2011-04-01 false Contribution in aid of construction. 1.118-2 Section...Income § 1.118-2 Contribution in aid of construction. (a) Special rule... (i) The amount is a contribution in aid of construction under paragraph (b)...

  14. 26 CFR 1.118-2 - Contribution in aid of construction.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2010-04-01 false Contribution in aid of construction. 1.118-2 Section...Income § 1.118-2 Contribution in aid of construction. (a) Special rule... (i) The amount is a contribution in aid of construction under paragraph (b)...

  15. 26 CFR 1.118-2 - Contribution in aid of construction.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 false Contribution in aid of construction. 1.118-2 Section...Income § 1.118-2 Contribution in aid of construction. (a) Special rule... (i) The amount is a contribution in aid of construction under paragraph (b)...

  16. 26 CFR 1.118-2 - Contribution in aid of construction.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 false Contribution in aid of construction. 1.118-2 Section...Income § 1.118-2 Contribution in aid of construction. (a) Special rule... (i) The amount is a contribution in aid of construction under paragraph (b)...

  17. Polychlorinated biphenyl (118) activates osteoclasts and induces bone resorption in goldfish.

    PubMed

    Yachiguchi, Koji; Matsumoto, Noriko; Haga, Yuki; Suzuki, Motoharu; Matsumura, Chisato; Tsurukawa, Masahiro; Okuno, Toshihiro; Nakano, Takeshi; Kawabe, Kimi; Kitamura, Kei-ichiro; Toriba, Akira; Hayakawa, Kazuichi; Chowdhury, Vishwajit S; Endo, Masato; Chiba, Atsuhiko; Sekiguchi, Toshio; Nakano, Masaki; Tabuchi, Yoshiaki; Kondo, Takashi; Wada, Shigehito; Mishima, Hiroyuki; Hattori, Atsuhiko; Suzuki, Nobuo

    2014-05-01

    To analyze the effect of polychlorinated biphenyl (PCB) 118 on fish bone metabolism, we examined osteoclastic and osteoblastic activities, as well as plasma calcium levels, in the scales of PCB (118)-injected goldfish. In addition, effect of PCB (118) on osteoclasts and osteoblasts was investigated in vitro. Immature goldfish, in which the endogenous effects of sex steroids are negligible, were used. PCB (118) was solubilized in dimethyl sulfoxide at a concentration of 10 ppm. At 1 and 2 days after PCB (118) injection (100 ng/g body weight), both osteoclastic and osteoblastic activities, and plasma calcium levels were measured. In an in vitro study, then, both osteoclastic and osteoblastic activities as well as each marker mRNA expression were examined. At 2 days, scale osteoclastic activity in PCB (118)-injected goldfish increased significantly, while osteoblastic activity did not change significantly. Corresponding to osteoclastic activity, plasma calcium levels increased significantly at 2 days after PCB (118) administration. Osteoclastic activation also occurred in the marker enzyme activities and mRNA expressions in vitro. Thus, we conclude that PCB (118) disrupts bone metabolism in goldfish both in vivo and in vitro experiments. PMID:23247518

  18. 46 CFR 502.118 - Copies of documents for use of the Commission.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Copies of documents for use of the Commission. 502.118 Section...PROCEDURE Form, Execution, and Service of Documents § 502.118 Copies of documents for use of the Commission. (a)...

  19. Cleanup Verification Package for the 118-B-6, 108-B Solid Waste Burial Ground

    SciTech Connect

    M. L. Proctor

    2006-06-13

    This cleanup verification package documents completion of remedial action for the 118-B-6, 108-B Solid Waste Burial Ground. The 118-B-6 site consisted of 2 concrete pipes buried vertically in the ground and capped by a concrete pad with steel lids. The site was used for the disposal of wastes from the "metal line" of the P-10 Tritium Separation Project.

  20. Palladium-Catalyzed Hydroaminocarbonylation of Alkenes with Amines: A Strategy to Overcome the Basicity Barrier Imparted by Aliphatic Amines.

    PubMed

    Zhang, Guoying; Gao, Bao; Huang, Hanmin

    2015-06-22

    A novel and efficient palladium-catalyzed hydroaminocarbonylation of alkenes with aminals has been developed under mild reaction conditions, and allows the synthesis of a wide range of N-alkyl linear amides in good yields with high regioselectivity. On the basis of this method, a cooperative catalytic system operating by the synergistic combination of palladium, paraformaldehyde, and acid was established for promoting the hydroaminocarbonylation of alkenes with both aromatic and aliphatic amines, which do not react well under conventional palladium-catalyzed hydroaminocarbonylation. PMID:25959632

  1. Synthesis and characterization of palladium nanoparticles using Catharanthus roseus leaf extract and its application in the photo-catalytic degradation

    NASA Astrophysics Data System (ADS)

    Kalaiselvi, Aasaithambi; Roopan, Selvaraj Mohana; Madhumitha, Gunabalan; Ramalingam, C.; Elango, Ganesh

    2015-01-01

    The potential effect of Catharanthus roseus leaf extract for the formation of palladium nanoparticles and its application on dye degradation was discussed. The efficiency of C.roseus leaves are used as a bio-material for the first time as reducing agent. Synthesized palladium nanoparticles were supported by UV-vis spectrometry, XRD, FT-IR and TEM analysis. The secondary metabolites which are responsible for the formation of nanoparticles were identified by GC-MS. The results showed that effect of time was directly related to synthesized nanoparticles and functional groups has a critical role in reducing the metal ions and stabilizing the palladium nanoparticles in an eco-friendly process.

  2. Mechanistic study of palladium catalyzed S–S and Se–Se bonds addition to alkynes

    Microsoft Academic Search

    Valentine P Ananikov; Michael A Kabeshov; Irina P Beletskaya; Grigory G Aleksandrov; Igor L Eremenko

    2003-01-01

    The mechanistic study of palladium catalyzed S–S and Se–Se bonds addition to alkynes revealed the involvement of dinuclear transition metal complexes in the catalytic cycle. Coordination of alkyne to dinuclear transition metal complex was found to be the rate determining step of the reaction. An unusual phosphine ligand effect increasing the yield of addition reaction was found in the studied

  3. Spectroscopic investigation of palladium-copper bimetallic systems for PEM fuel cell catalysts

    Microsoft Academic Search

    Timo Hofmann

    2009-01-01

    One of the main barriers to commercialization of polymer electrolyte membrane fuel cells systems is cost, which is largely due to the need of platinum (Pt)-containing catalysts. In this thesis we investigate bimetallic systems consisting of a base metal (copper) and a noble metal (palladium) that, as an alloy on the nanoscale, mimic the electronic properties that make Pt desirable

  4. Influence of co-metals on bimetallic palladium catalysts for methane combustion

    Microsoft Academic Search

    K. Persson; A. Ersson; K. Jansson; N. Iverlund; S. Järås

    2005-01-01

    The catalytic combustion of methane has been investigated over eight different bimetallic palladium catalysts, comprising the co-metals Co, Rh, Ir, Ni, Pt, Cu, Ag, or Au. The catalysts were characterized by TEM, EDS, PXRD, and temperature-programmed oxidation (TPO). It was found that a catalyst containing both Pd and Pt was the most promising, as it had a high activity that

  5. Palladium Hydride Promoted Stereoselective Isomerization of Unactivated Di(exo)methylenes to Endocyclic Dienes

    PubMed Central

    2015-01-01

    The exomethylenes of 2,6-disubstituted bicyclo[3.3.1]nonan-9-ones 2 are readily isomerized over a palladium catalyst under an atmosphere of hydrogen to predominantly form the isomer 3 with C2 symmetry with very little formation of the analogous product with Cs symmetry. A hydrogen source is essential to effect the rearrangement. PMID:24720691

  6. Synthesis of dihydrofuroflavonoids via palladium-catalyzed annulation of 1,3-dienes

    Microsoft Academic Search

    Roman V. Rozhkov; Richard C. Larock

    2004-01-01

    The palladium-catalyzed annulation of 1,3-dienes by o-iodoacetoxyflavonoids provides an efficient approach to biologically interesting dihydrofuroflavonoids. This reaction is very general, regioselective, and a wide variety of terminal, cyclic, and internal 1,3-dienes can be utilized.

  7. Palladium-catalyzed oxidative regio- and diastereoselective diarylating carbocyclization of dienynes.

    PubMed

    Jiang, Min; Bäckvall, Jan-E

    2013-05-17

    Transmetallation: A highly regio- and diastereoselective carbocyclization involving a palladium-catalyzed 1,2-addition of two carbon atoms across a conjugated diene has been developed (see scheme). The reaction is performed with dienynes and an oxygen tether containing a terminal or internal triple bond. PMID:23576471

  8. Carbon supports from natural organic materials and carbon-supported palladium catalysts

    SciTech Connect

    Kuznetsov, B.N. [Russian Academy of Sciences, Krasnoyarsk (Russian Federation)

    2007-07-15

    Experimental data are presented concerning the influence of preparation conditions on the pore structure of carbon supports obtained from different types of plant biomass, thermally expanded graphites, and chemically modified anthracites, on the distribution and particle size of supported palladium, and on the activity of the supported catalyst in the liquid-phase hydrogenation of hex-1-ene and cyclohexene.

  9. Palladium-catalyzed, pyrrolidine-mediated arylmethylation of ketones and aldehydes with coumarinyl(methyl) acetates†

    PubMed Central

    Cattopadhyay, Kalicharan; Recio, Antonio; Tunge, Jon A.

    2012-01-01

    We report the palladium-catalyzed, pyrrolidine-mediated ?-benzylation of enamines generated from aldehydes and ketones. The method allows for direct coupling of medicinally relevant coumarin moieties with aldehydes and ketones in good yield under mild conditions. The reaction is believed to proceed via a Pd-?-benzyl complex generated from (coumarinyl)methyl acetates. PMID:22832549

  10. Abstract: Several unsymmetrical heterobiaryls have been synthesized through palladium-catalyzed cross-coupling reactions

    E-print Network

    zincates using only one third equivalent of zinc chloride for the synthesis of 5-aryl-2-furaldehydes from 5 chloride to perform nickel- or palladium-catalyzed couplings of aryl Grignard reagents with aryl halides.10, respectively. Nickel-catalyzed cross-couplings of organozinc compounds have been described.14 However

  11. Palladium-Catalyzed Hiyama Cross-Coupling of Aryltrifluorosilanes with Aryl and Heteroaryl Chlorides

    PubMed Central

    Molander, Gary A.; Iannazzo, Laura

    2011-01-01

    An efficient, palladium-catalyzed Hiyama cross-coupling reaction of aryltrifluorosilanes with aryl chlorides has been developed. A wide variety of functionalized biaryl derivatives were isolated in good to excellent yields. The scope of this reaction has also been extended to heteroaryl chlorides, affording the corresponding heterobiaryl compounds in high yields. PMID:21978184

  12. Morphology and Gas Adsorption Properties of Palladium-Cobalt-Based Cyanogels

    E-print Network

    Gruner, Sol M.

    Morphology and Gas Adsorption Properties of Palladium-Cobalt-Based Cyanogels Rahul S. Deshpande dioxide adsorption, permeability measurements, electron microscopy, and small-angle X-ray scattering these particles constitute the mesopores. The aerogel surfaces are found to be fractal as analyzed by gas

  13. Mechanistic study of the hydrothermal reduction of palladium on the Tobacco mosaic virus.

    PubMed

    Adigun, Oluwamayowa O; Freer, Alexander S; Miller, Jeffrey T; Loesch-Fries, L Sue; Kim, Bong Suk; Harris, Michael T

    2015-07-15

    The fundamental mechanisms governing reduction and growth of palladium on the genetically engineered Tobacco mosaic virus in the absence of an external reducer have been elucidated via in situ X-ray absorption spectroscopy. In recent years, many virus-inorganic materials have been synthesized as a means to produce high quality nanomaterials. However, the underlying mechanisms involved in virus coating have not been sufficiently studied to allow for directed synthesis. We combined XAS, via XANES and EXAFS analysis, with TEM to confirm an autocatalytic reduction mechanism mediated by the TMV1Cys surface. This reduction interestingly proceeds via two first order regimes which result in two linear growth regimes as spherical palladium nanoparticles are formed. By combining this result with particle growth data, it was discovered that the first regime describes growth of palladium nanoparticles on the virion while the second regime describes a second layer of larger particles which grew sporadically on the first palladium nanoparticle layer. Subsequent aggregation of free solution based spherical particles and metallized nanorods characterize a third and final regime. At the end of the second reduction regime, the average particle diameter of particles tethered to the TMV1Cys surface are approximately 4.5 nm. The use of XAS to simultaneously monitor the kinetics of biotemplated reactions along with growth of metal nanoparticles will provide insight into the pertinent reduction and growth mechanisms so that nanorod properties can be controlled through their populating nanoparticles. PMID:25801128

  14. The behavior of palladium catalysts in direct formic acid fuel cells

    NASA Astrophysics Data System (ADS)

    Zhu, Yimin; Khan, Zakia; Masel, R. I.

    Previous work has considered the behavior of platinum based catalysts in direct methanol and Direct Formic Acid Fuel Cells (DFAFCs). In this paper, we explore the behavior of palladium-based anode catalyst for DFAFCs. The palladium catalysts produce significant performance enhancements. DFAFCs operated with dry air and zero back-pressure can generate power densities of 255˜230 mW cm -2 at relatively high voltages of 0.40˜0.50 V in a concentration range of formic acid from 3.0 to 15.0 M at a room temperature of 20 °C, which are not quite different from a hydrogen-air polymer exchange membrane (PEM) fuel cell with power density of 320 mW cm -2 obtained under the comparable conditions, and much higher than a direct methanol fuel cell (DMFC) with power density of 50 mW cm -2. The stability of the membrane electrode assembly (MEA) with palladium catalyst has also been evaluated. There is some decay in performance over several hours. However, the performance loss of DFAFCs can be fully recovered by applying a positive potential at the fuel cell anode after short-term life test. These results demonstrate that DFAFCs with palladium anode catalyst have exceptional properties for portable power applications.

  15. Performance of the direct formic acid fuel cell with electrochemically modified palladium–antimony anode catalyst

    Microsoft Academic Search

    John L. Haan; Kristin M. Stafford; Robert D. Morgan; Richard I. Masel

    2010-01-01

    Previous work has shown that palladium catalysts are quite active for formic acid electrooxidation, but the catalysts need to be periodically regenerated to remove a CO impurity from the surface. The objective of this paper is to determine whether antimony additions could suppress the CO formation under fuel cell conditions. We find that antimony doubles the rate of reaction in

  16. Copper-based electrochemical sensor with palladium electrode for cathodic stripping voltammetry of manganese.

    PubMed

    Kang, Wenjing; Pei, Xing; Bange, Adam; Haynes, Erin N; Heineman, William R; Papautsky, Ian

    2014-12-16

    In this work, we report on the development of a palladium-based, microfabricated point-of-care electrochemical sensor for the determination of manganese using square wave cathodic stripping voltammetry. Heavy metals require careful monitoring, yet current methods are too complex for a point-of-care system. Voltammetry offers an attractive approach to metal detection on the microscale, but traditional carbon, gold, or platinum electrodes are difficult or expensive to microfabricate, preventing widespread use. Our sensor uses palladium working and auxiliary electrodes and integrates them with a copper-based reference electrode for simple fabrication and compatibility with microfabrication and printed circuit board processing, while maintaining competitive performance in electrochemical detection. Copper electrodes were prepared on glass substrate using a combination of microfabrication procedures followed by electrodeposition of palladium. The disposable sensor system was formed by bonding a poly(dimethylsiloxane) (PDMS) well to the glass substrate. Cathodic stripping voltammetry of manganese using our new disposable palladium-based sensors exhibited 334 nM (18.3 ppb) limit of detection in borate buffer. The sensor was used to demonstrate manganese determination in natural water samples from a pond in Burnet Woods, located in Cincinnati, OH, and the Ohio River. PMID:25476591

  17. GREENER SYNTHESIS OF ALIGNED PALLADIUM NANOBELTS AND NANOPLATES IN AQUEOUS MEDIUM USING VITAMIN B1

    EPA Science Inventory

    Palladium (Pd) plays an important role in many industrial and technological applications such as reduction of automobile pollutants, and Suzuki, Heck, and Stille coupling reactions. Consequently, a great deal of effort has been devoted to the synthesis of Pd nanostructures. Her...

  18. In-situ spectroscopic ellipsometry study of copper selective-area atomic layer deposition on palladium

    SciTech Connect

    Jiang, Xiaoqiang; Wang, Han; Qi, Jie; Willis, Brian G., E-mail: bgwillis@engr.uconn.edu [Department of Chemical and Biomolecular Engineering University of Connecticut, Storrs, Connecticut 06269-3222 (United States)

    2014-07-01

    Selective area copper atomic layer deposition on palladium seed layers has been investigated with in-situ real-time spectroscopic ellipsometry to probe the adsorption/desorption and reaction characteristics of individual deposition cycles. The reactants are copper bis(2,2,6,6-tetramethyl-3,5-heptanedionate) vapor and hydrogen gas. Self-limiting atomic layer deposition was observed in the temperature range of 135–230?°C in a low pressure reactor. Under optimal conditions, growth occurs selectively on palladium and not on silicon dioxide or silicon nitride layers. Based on in-situ ellipsometry data and supporting experiments, a new mechanism for growth is proposed. In the proposed mechanism, precursor adsorption is reversible, and dissociatively adsorbed hydrogen are the stable surface intermediates between growth cycles. The mechanism is enabled by continuous diffusion of palladium from the seed layer into the deposited copper film and strong H* binding to palladium sites. Less intermixing can be obtained at low growth temperatures and short cycle times by minimizing Cu/Pd inter-diffusion.

  19. GREEN SYNTHESIS OF SILVER AND PALLADIUM NANOPARTICLES AT ROOM TEMPERATURE USING COFFEE AND TEA EXTRACT

    EPA Science Inventory

    An extremely simple green approach that generates bulk quantities of nanocrystals of noble metals such as silver (Ag) and palladium (Pd) using coffee and tea extract at room temperature is described. The single-pot method uses no surfactant, capping agent, and/or template. The ob...

  20. Formation and Structure of Self-Assembled Monolayers of Alkanethiolates on Palladium

    E-print Network

    Prentiss, Mara

    Formation and Structure of Self-Assembled Monolayers of Alkanethiolates on Palladium J. Christopher produces well-organized, self-assembled monolayers. The organization of the alkane chains in the monolayer of self-assembled monolayers (SAMs) of n-alkanethiolates formed by the adsorption of n

  1. One-pot synthesis of keto thioethers by palladium/gold-catalyzed click and pinacol reactions.

    PubMed

    Cadu, Alban; Watile, Rahul A; Biswas, Srijit; Orthaber, Andreas; Sjöberg, Per J R; Samec, Joseph S M

    2014-11-01

    An atom-efficient synthesis of keto thioethers was devised via tandem gold/palladium catalysis. The reaction proceeds through a regioselective thiol attack at the ?-position of the alcohol, followed by an alkyl, aryl, or benzyl 1,2-shift. Both acyclic and cyclic systems were studied, in the latter case leading to the ring expansion of cyclic substrates. PMID:25325145

  2. Heat and Helium Production During Exothermic Reactions Between Gases Through Palladium Geometrical Elements Loaded with Hydrogen

    Microsoft Academic Search

    Giuseppe Agelao; Maria Carmela Romano; Francesco Italiano

    2000-01-01

    In this research, the effect of the shape of hydrogen-loaded palladium elements on exothermic reactions between gases is shown. It was found that an element with parts of its surface next to each other spontaneously triggers reactions, whereas an element whose surfaces are not next to each other needs outside triggering. The heat developed makes the temperature of the elements

  3. Characterization of Palladium Nanoparticles by Using X-ray Reflectivity, EXAFS, and Electron Microscopy

    E-print Network

    Frenkel, Anatoly

    Characterization of Palladium Nanoparticles by Using X-ray Reflectivity, EXAFS, and Electron. The particles were also analyzed with extended X-ray absorption fine structure (EXAFS). A cuboctahedral fcc was observed in both one- and two-phase particles by electron diffraction, HRTEM, and EXAFS. At the air

  4. Stable ??Radical from a Contracted Doubly N-Confused Hexaphyrin by Double Palladium Metalation.

    PubMed

    Hisamune, Yutaka; Nishimura, Keiichi; Isakari, Koji; Ishida, Masatoshi; Mori, Shigeki; Karasawa, Satoru; Kato, Tatsuhisa; Lee, Sangsu; Kim, Dongho; Furuta, Hiroyuki

    2015-06-15

    A contracted doubly N-confused dioxohexaphyrin derivative served as a dinucleating metal ligand for unsymmetrical coordination. The complexation of two palladium(II) cations led to the formation of ?-radical species that were persistent in atmospheric air in the presence of moisture. Effective delocalization of an unpaired electron over the hexaphyrin backbone could contribute to the distinct chemical stability. PMID:25951535

  5. Palladium-catalyzed formylation of aryl halides with tert-butyl isocyanide.

    PubMed

    Jiang, Xiao; Wang, Jin-Mei; Zhang, Ying; Chen, Zhong; Zhu, Yong-Ming; Ji, Shun-Jun

    2014-07-01

    A novel palladium-catalyzed formylation of aryl halides with isocyanide in the presence of Et3SiH has been demonstrated, which provides a strategy toward important aldehydes with moderate to excellent yield. The advantage of this reaction includes milder conditions, convenient operation, lower toxicity, and wide functional group tolerance. PMID:24956352

  6. Passive fit of frameworks in titanium and palladium-silver alloy submitted the laser welding.

    PubMed

    de Sousa, S A; de Arruda Nobilo, M A; Henriques, G E P; Mesquita, M F

    2008-02-01

    This study evaluated the precision of fit of implant frameworks cast in titanium (cp Ti) and palladium-silver alloy (Pd-Ag), made by the one-piece cast and laser welding techniques. From a metal matrix with five implants, 20 master casts were obtained, to which replicas of implants were incorporated. On these masters 10 frameworks were made for each type of material (cp Ti and Pd-Ag alloy). Half of these were made by the one-piece cast technique and the other half by the laser welding technique. The implant/prosthesis interface was analysed and measured in the vestibular and lingual regions of the central and distal implants with the help of a measuring microscope. The results indicated that in the central cylinders, the Tukey test (P<0.0005) showed a significant difference in the passive fit between the laser-welded frameworks (34.73 microm) and those one-piece cast frameworks (151.39 microm), and as regards materials, the palladium-silver alloy (66.30 microm) showed better results than the titanium (119.83 microm). In the distal cylinders there was no significant difference between the frameworks cast in titanium and palladium-silver by the one-piece technique. However, after laser welding, there was a significant difference for the frameworks cast in titanium (31.37 microm) and palladium-silver (106.59 microm). PMID:18197845

  7. Wavelength response of a surface plasmon resonance palladium-coated optical fiber sensor for hydrogen detection

    Microsoft Academic Search

    Cedric Perrotton; Martin Slaman; Nicolas Javahiraly; Herman Schreuders; Bernard Dam; Patrick Meyrueis

    2011-01-01

    An optical fiber using palladium as sensitive layer is characterized in the range of 450 to 900 nm. The sensitive layer is deposited on the outside of a multimode fiber, after removing the optical cladding. The sensor is based on a measurement technique that uses the surface plasmon resonance effect. A continuous change in output intensity is observed as a

  8. Assembly of a Cost-Effective Anode Using Palladium Nanoparticles for Alkaline Fuel Cell Applications

    ERIC Educational Resources Information Center

    Feliciano-Ramos, Ileana; Casan~as-Montes, Barbara; García-Maldonado, María M.; Menendez, Christian L.; Mayol, Ana R.; Díaz-Vazquez, Liz M.; Cabrera, Carlos R.

    2015-01-01

    Nanotechnology allows the synthesis of nanoscale catalysts, which offer an efficient alternative for fuel cell applications. In this laboratory experiment, the student selects a cost-effective anode for fuel cells by comparing three different working electrodes. These are commercially available palladium (Pd) and glassy carbon (GC) electrodes, and…

  9. OK QPiOoAAO 5 Experiments on Palladium-and

    E-print Network

    .1. Palladium-deuterium 5 2.2. Titanium-deuterium 6 3. Results 7 3.1. Neutron detection on titanium-deuterium 7 ). This knowledge dates back to the 1920- 40-ies, and is a consequence of the chemical potential variations being

  10. Production of spherical powders of palladium and its alloys with silver for multilayer ceramic capacitors

    Microsoft Academic Search

    A. I. Blokhin; M. L. Blokhina

    1995-01-01

    A significant quantity of silver, palladium, platinum, and ruthenium is consumed in the form of dispersed powders in the composition of conducting or resistive pastes for electronics. The purpose of investigations in the area of synthesis of precious metal powders is improvement in the quality of parts based on them and economy in valuable materials. The authors of [1-3] discussed

  11. HYDROGENATION OF OLEFINS USING PALLADIUM NANOPARTICLES PREPARED WITH PULSE ELECTROCHEMICAL DEPOSITION

    EPA Science Inventory

    Electrochemistry has been used to synthesize nano-structured materials. In this project, we have conducted the application of electrochemistry for the synthesis of nano-palladium catalysts that may have application in the area of green chemistry. The electrochemical technique use...

  12. Copper Mediated Hydrothermal Synthesis of Ultra Long Pentagonally Twinned Palladium Nanowires

    NASA Astrophysics Data System (ADS)

    Hanson, Jennifer

    Palladium nanowires (Pd NWs) have attracted considerable attention due to applications in hydrogen sensing and heterogeneous catalysis. Several methods have been reported for the synthesis of Pd NWs including using chemical vapor transport, electrodeposition in porous membranes, electron beam lithography, and colloidal self-assembly; however, it has been challenging to produce large quantities. Hydrothermal methods have been reported recently for the production of high yields of Pd NWs using palladium (II) chloride as a metal precursor, deionized water as the solvent, and polyvinylpyrrolidone for the NW capping agent. Reported prior methods have not been reproducible. With the introduction of trace amounts of Copper (II) ions synthesis is possible and aspect ratios of >500 have been obtained. It is likely that the deionized water used in the synthesis contained trace amounts of copper from metal pipes, thus leading to the synthesis of PdNWs. Copper ions have been shown to act as effective oxygen scavengers during the aqueous synthesis and we postulate that oxidative etching of multiply pentagonally twinned palladium seeds must be avoided in order to achieve high yields of palladium nanowires. This research focuses on the trace addition of copper ions and improvement of the Pd NW synthesis.

  13. An efficient transformation of primary halides into nitriles through palladium-catalyzed hydrogen transfer reaction.

    PubMed

    Zou, Tao; Yu, Xiaoqiang; Feng, Xiujuan; Bao, Ming

    2015-07-01

    Two-step one-pot transformation of primary halides into corresponding nitriles is successfully achieved. Nucleophilic substitution of primary halides with sodium azide and subsequent palladium-catalyzed hydrogen transfer proceeds smoothly in the presence of sterically bulky ligand dicyclohexyl(2',4',6'-triisopropylbiphenyl-2-yl)phosphine (XPhos) in acetone to produce nitriles in satisfactory to good yields. PMID:26050994

  14. High-Resolution Mass Spectrum for Deuterium (hydrogen) Gas Permeating Palladium Film

    NASA Astrophysics Data System (ADS)

    Wei, Qing M.; Li, Xing Z.; Liu, Bin; Mueller, N.; Schoch, P.; Oehre, H.

    High-resolution mass spectrometer was used to analyze the gas from a deuterium flux maker. Mass 3 components were analyzed carefully to inspect any anomaly from the deuterium gas permeating a palladium film. Mass 3 component is confirmed again, but more work is needed to separate the signal of the helium-3 (if any) from the heavy background of D-T molecules.

  15. Asymmetric cyclopropanation of ketene silyl acetal with allylic acetate catalyzed by a palladium complex

    Microsoft Academic Search

    Akiharu Satake; Hitomi Kadohama; Hiroyuki Koshino; Tadashi Nakata

    1999-01-01

    The first asymmetric cyclopropanation of ketene silyl acetal with allylic acetate was achieved. New chiral oxazolidinylpyrazole ligands and their ?3-allylpalladium complexes were synthesized. Reaction of cinnamyl acetate with ketene silyl acetal of ethyl isobutylate in the presence of a palladium complex gave a phenyl cyclopropane derivative in 20? 54%ee.

  16. Palladium(II)/Brønsted Acid-Catalyzed Enantioselective Oxidative Carbocyclization–Borylation of Enallenes**

    PubMed Central

    Jiang, Tuo; Bartholomeyzik, Teresa; Mazuela, Javier; Willersinn, Jochen; Bäckvall, Jan-E

    2015-01-01

    An enantioselective oxidative carbocyclization–borylation of enallenes that is catalyzed by palladium(II) and a Brønsted acid was developed. Biphenol-type chiral phosphoric acids were superior co-catalysts for inducing the enantioselective cyclization. A number of chiral borylated carbocycles were synthesized in high enantiomeric excess. PMID:25808996

  17. 34 CFR 403.118 - Under what circumstances may the Secretary waive the distribution requirements for the...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    34 Education 3 2014-07-01 2014-07-01 false ...requirements for the Postsecondary and Adult Vocational Education Programs? 403.118 Section 403.118 Education Regulations of the Offices of the Department...

  18. 34 CFR 403.118 - Under what circumstances may the Secretary waive the distribution requirements for the...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    34 Education 3 2012-07-01 2012-07-01 false ...requirements for the Postsecondary and Adult Vocational Education Programs? 403.118 Section 403.118 Education Regulations of the Offices of the Department...

  19. 34 CFR 403.118 - Under what circumstances may the Secretary waive the distribution requirements for the...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    34 Education 3 2013-07-01 2013-07-01 false ...requirements for the Postsecondary and Adult Vocational Education Programs? 403.118 Section 403.118 Education Regulations of the Offices of the Department...

  20. Pumice-supported palladium catalysts. II. Selective hydrogenation of 1,3-cyclooctadiene

    SciTech Connect

    Deganello, G.; Duca, D.; Martorana, A. [Universita di Palermo (Italy)] [Universita di Palermo (Italy); Fagherazzi, G.; Benedetti, A. [Universita di Venezia (Italy)] [Universita di Venezia (Italy)

    1994-11-01

    Two series of pumice-supported palladium catalysts (W and U) have been tested in the liquid-phase selective hydrogenation of 1,3-cyclooctadiene (1,3-COD) to cyclooctene (COE). The two series of catalysts, obtained via organometallic precursors, differ in the preparation procedure. In the W series the reduced metal derives only from Pd intermediates anchored to pumice; in the U series the metal originates also from unreacted Pd(allyl){sub 2} species in solution. The U catalysts present agglomerated metal particles. The hydrogenations, free of any diffusion problems, were performed at constant pressure of hydrogen (1 atm). Analysis of the data suggests that the rate-determining step is a surface reaction involving activated 1,3-COD. Selectivity is very high since cyclooctane (COA) is detected only when all 1,3-COD is consumed. The turnover frequencies (TOF{sub 1}) of the first semihydrogenation do not change with palladium dispersion, determined from the Porod diameter D{sub p} up to D{sub x} < 35%, but thereafter they slowly decrease. Experimental evidence, such as the absence of oxidation when exposed to air and the negative shift of binding energy of the Pd 3d level in XPS measurements, indicate a different behavior of the present catalysts in comparison with other supported palladium catalysts. These differences are attributed to the presence of alkali metal ions (Na{sup +}, K{sup +}) on the pumice surface and are explained on the basis of the change in electron density and/or in the ensemble size of the supported palladium. Several interesting features and differences in activity and selectivity between the two series of catalysts can be accounted for by the presence of agglomerated palladium particles in the U series and are discussed in terms of the evolution of parameters with dispersion. 40 refs., 8 figs., 2 tabs.

  1. PALLADIUM/COPPER ALLOY COMPOSITE MEMBRANES FOR HIGH TEMPERATURE HYDROGEN SEPARATION FROM COAL-DERIVED GAS STREAMS

    SciTech Connect

    J. Douglas Way

    2003-01-01

    For hydrogen from coal gasification to be used economically, processing approaches that produce a high purity gas must be developed. Palladium and its alloys, nickel, platinum and the metals in Groups 3 to 5 of the Periodic Table are all permeable to hydrogen. Hydrogen permeable metal membranes made of palladium and its alloys are the most widely studied due to their high hydrogen permeability, chemical compatibility with many hydrocarbon containing gas streams, and infinite hydrogen selectivity. Our Pd composite membranes have demonstrated stable operation at 450 C for over 70 days. Coal derived synthesis gas will contain up to 15000 ppm H{sub 2}S as well as CO, CO{sub 2}, N{sub 2} and other gases. Highly selectivity membranes are necessary to reduce the H{sub 2}S concentration to acceptable levels for solid oxide and other fuel cell systems. Pure Pd-membranes are poisoned by sulfur, and suffer from mechanical problems caused by thermal cycling and hydrogen embrittlement. Recent advances have shown that Pd-Cu composite membranes are not susceptible to the mechanical, embrittlement, and poisoning problems that have prevented widespread industrial use of Pd for high temperature H{sub 2} separation. These membranes consist of a thin ({le} 5 {micro}m) film of metal deposited on the inner surface of a porous metal or ceramic tube. With support from this DOE Grant, we have fabricated thin, high flux Pd-Cu alloy composite membranes using a sequential electroless plating approach. Thin, Pd{sub 60}Cu{sub 40} films exhibit a hydrogen flux more than ten times larger than commercial polymer membranes for H{sub 2} separation, resist poisoning by H{sub 2}S and other sulfur compounds typical of coal gas, and exceed the DOE Fossil Energy target hydrogen flux of 80 ml/cm{sup 2} {center_dot} min = 0.6 mol/m{sup 2} {center_dot} s for a feed pressure of 40 psig. Similar Pd-membranes have been operated at temperatures as high as 750 C. We have developed practical electroless plating procedures for fabrication of thin Pd-Cu composite membranes at any scale.

  2. A Microfluidic System for the Continuous Recycling of Unmodified Homogeneous Palladium Catalysts through Liquid/Liquid Phase Separation

    E-print Network

    Li, Pengfei

    A prototype microflow system for the continuous recycling of homogeneous catalysts through liquid/liquid phase separation was developed and its effectiveness demonstrated in a challenging palladium-catalyzed hydroxylation ...

  3. Palladium-catalyzed regio- and enantioselective allylic alkylation of bis allylic carbonates derived from Morita-Baylis-Hillman adducts.

    PubMed

    Trost, Barry M; Brennan, Megan K

    2007-09-27

    Morita-Baylis-Hillman diene adducts are used as substrates in the palladium-catalyzed asymmetric allylic alkylation reaction with oxygen and carbon nucleophiles in good regio- and enantioselectivity. PMID:17803313

  4. A palladium - catalyzed domino reaction of 3-acetyl-5-hexyn-2-one with aryl iodides under carbon monoxide

    Microsoft Academic Search

    Antonio Arcadi; Elisabetta Rossi

    1996-01-01

    The palladium-catalyzed reaction of 3-acetyl-5-hexyn-2-one with aryl iodides under a carbon monoxide atmosphere produces different 2,3,5-trisubstituted furans depending on the alkyne\\/aryl iodide ratio.

  5. Palladium-Catalyzed Hydroxylation of Aryl and Heteroaryl Halides Enabled by the Use of a Palladacycle Precatalyst

    E-print Network

    Cheung, Chi Wai

    A method for the hydroxylation of aryl and heteroaryl halides, promoted by a catalyst based on a biarylphosphine ligand tBuBrettPhos (L5) and its corresponding palladium precatalyst (1), is described. The reactions allow ...

  6. Palladium-catalyzed C-N cross-coupling reactions toward the synthesis of drug-like molecules

    E-print Network

    McAvoy, Camille Z

    2012-01-01

    The development of methodologies for C-N bond formation reactions is an important scientific challenge because of many academic and industrial applications. This work will focus particularly on palladium-catalyzed ...

  7. Expanding the substrate scope in palladium-catalyzed C-N and C-C bond-forming reactions

    E-print Network

    Anderson, Kevin William

    2006-01-01

    Chapter 1. The first detailed study of the palladium-catalyzed amination of aryl nonaflates is reported. Use of bulky electron-rich monophosphinobiaryl ligands or BINAP allow for the catalytic amination of electron-rich ...

  8. A Bulky Biaryl Phosphine Ligand Allows for Palladium-Catalyzed Amidation of Five-Membered Heterocycles as Electrophiles

    E-print Network

    Su, Mingjuan

    The incredible bulk: The first palladium-catalyzed amidation of five-membered heterocyclic bromides with multiple heteroatoms was achieved using the Pd/1 catalyst system. N-Arylated imidazoles, pyrazoles, thiazoles, pyrroles, ...

  9. A Single Phosphine Ligand Allows Palladium-Catalyzed Intermolecular C-O Bond Formation with Secondary and Primary Alcohols

    E-print Network

    Wu, Xiaoxing

    Forging a bond: An efficient, general palladium catalyst for C-O bond-forming reactions of secondary and primary alcohols with a range of aryl halides has been developed using the ligand 1. Heteroaryl halides, and for the ...

  10. Polypyrrole-palladium nanocomposite coating of micrometer-sized polymer particles toward a recyclable catalyst.

    PubMed

    Fujii, Syuji; Matsuzawa, Soichiro; Hamasaki, Hiroyuki; Nakamura, Yoshinobu; Bouleghlimat, Azzedine; Buurma, Niklaas J

    2012-02-01

    A range of near-monodisperse, multimicrometer-sized polymer particles has been coated with ultrathin overlayers of polypyrrole-palladium (PPy-Pd) nanocomposite by chemical oxidative polymerization of pyrrole using PdCl(2) as an oxidant in aqueous media. Good control over the targeted PPy-Pd nanocomposite loading is achieved for 5.2 ?m diameter polystyrene (PS) particles, and PS particles of up to 84 ?m diameter can also be efficiently coated with the PPy-Pd nanocomposite. The seed polymer particles and resulting composite particles were extensively characterized with respect to particle size and size distribution, morphology, surface/bulk chemical compositions, and conductivity. Laser diffraction studies of dilute aqueous suspensions indicate that the polymer particles disperse stably before and after nanocoating with the PPy-Pd nanocomposite. The Fourier transform infrared (FT-IR) spectrum of the PS particles coated with the PPy-Pd nanocomposite overlayer is dominated by the underlying particle, since this is the major component (>96% by mass). Thermogravimetric and elemental analysis indicated that PPy-Pd nanocomposite loadings were below 6 wt %. The conductivity of pressed pellets prepared with the nanocomposite-coated particles increased with a decrease of particle diameter because of higher PPy-Pd nanocomposite loading. "Flattened ball" morphologies were observed by scanning/transmission electron microscopy after extraction of the PS component from the composite particles, which confirmed a PS core and a PPy-Pd nanocomposite shell morphology. X-ray diffraction confirmed the production of elemental Pd and X-ray photoelectron spectroscopy studies indicated the existence of elemental Pd on the surface of the composite particles. Transmission electron microscopy confirmed that nanometer-sized Pd particles were distributed in the shell. Near-monodisperse poly(methyl methacrylate) particles with diameters ranging between 10 and 19 ?m have been also successfully coated with PPy-Pd nanocomposite, and stable aqueous dispersions were obtained. The nanocomposite particles functioned as an efficient catalyst for the aerobic oxidative homocoupling reaction of 4-carboxyphenylboronic acid in aqueous media for the formation of carbon-carbon bonds. The composite particles sediment in a short time (

  11. 41 CFR 102-118.125 - What if my agency uses a TD other than a GBL?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...2012-01-01 false What if my agency uses a TD other than a GBL? 102-118.125 Section 102-118.125 Public Contracts... § 102-118.125 What if my agency uses a TD other than a GBL? If your agency uses any other TD for shipping under its...

  12. 41 CFR 102-118.125 - What if my agency uses a TD other than a GBL?

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...2014-01-01 false What if my agency uses a TD other than a GBL? 102-118.125 Section 102-118.125 Public Contracts... § 102-118.125 What if my agency uses a TD other than a GBL? If your agency uses any other TD for shipping under its...

  13. 41 CFR 102-118.125 - What if my agency uses a TD other than a GBL?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...2011-01-01 false What if my agency uses a TD other than a GBL? 102-118.125 Section 102-118.125 Public Contracts... § 102-118.125 What if my agency uses a TD other than a GBL? If your agency uses any other TD for shipping under its...

  14. 41 CFR 102-118.125 - What if my agency uses a TD other than a GBL?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false What if my agency uses a TD other than a GBL? 102-118.125 Section 102-118.125 Public Contracts... § 102-118.125 What if my agency uses a TD other than a GBL? If your agency uses any other TD for shipping under its...

  15. 41 CFR 102-118.125 - What if my agency uses a TD other than a GBL?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false What if my agency uses a TD other than a GBL? 102-118.125 Section 102-118.125 Public Contracts... § 102-118.125 What if my agency uses a TD other than a GBL? If your agency uses any other TD for shipping under its...

  16. Simple and sensitive determination of nucleic acids using palladium(II) complex with 2-(2-thiazolylazo)-5-dimethylaminobenzoic acid

    Microsoft Academic Search

    Yong-Mei Hao; Han-Xi Shen

    2000-01-01

    The paper describes the use of the palladium(II) complex with 2-(2-thiazolylazo)-5-dimethylamino-benzoic acid (TAMB) for the spectrophotometric determination of nucleic acids with the detection limit at ng levels. At pH 5.9, Pd(II), TAMB and nucleic acids interact rapidly at room temperature to form a supermolecular complex, leading to absorbance decreases at 621 and 675nm of the palladium(II)–TAMB complex. With 675nm as

  17. Regio- and stereoselective synthesis of 2,3,5-trienoates by palladium-catalyzed alkoxycarbonylation of conjugated enyne carbonates.

    PubMed

    Karagöz, Ezgi ?ule; Ku?, Melih; Akp?nar, Gürkan Eray; Artok, Levent

    2014-10-01

    Palladium-catalyzed carbonylation of 2,4-enyne carbonates in an alcohol and under balloon pressure of CO proceeds through 1,5-substitution to yield (E)-2,3,5-trienoates. The olefin geometry of the substrate is important to control the overall stereochemistry of this alkoxycarbonylation method. The reaction proceeds through successive formation of ?-allylpalladium with an R(3) group oriented syn and ?-allenyl palladium complexes. PMID:25188027

  18. Determination of small amounts of palladium in wastes from reworking of spent catalysts by microwave induced plasma atomic emission spectrometry

    Microsoft Academic Search

    K. Jankowski

    1995-01-01

    Microwave induced plasma atomic emission spectrometry (MIP-AES) was used for analytical control of reworking of catalysts. Palladium was determined in plant wastes after acid digestion in open systems or systems under pressure. The conditions for introduction of analyte solution using ultrasonic nebulisation and excitation of palladium in the low-power argon microwave plasma sustained in the TM010 Beenakker type resonator were

  19. Braze oxidation behavior and joint microstructure in YSZ\\/steel joints made using palladium brazes for SOFC applications

    Microsoft Academic Search

    M. Singh; T. P. Shpargel; R. Asthana

    2008-01-01

    Two palladium-base brazes (Palco and Palni), and two silver-base brazes containing palladium as an alloying element (Palcusil-10 and Palcusil-15) were evaluated for oxidation resistance at 750°C, and used in joining yttria-stabilized zirconia (YSZ) to a corrosion-resistant ferritic stainless steel for possible use in solid oxide fuel cell (SOFC) interconnects. Thermogravimetric analysis (TGA), and optical and scanning electron microscopy (SEM) coupled

  20. Adsorbate-induced corrosion: anodic dissolution of palladium induced by chemisorbed iodine in halide-free acid solutions 

    E-print Network

    Schimpf, Janemarie A

    1991-01-01

    -Ray Photoelectron Spectroscopy (XPS). The principal findings of this study are as follows: (i) It was found that the chemisorbed iodine remained bonded to the surface of the palladium electrode during the dissolution process. (ii) When solution from the oxidation...ADSORBATE-INDUCED CORROSION: ANODIC DISSOLUTION OF PALLADIUM INDUCED BY CHEMISORBED IODINE IN HALIDE-FREE ACID SOLUTIONS A Thesis JANEMARIE A. SCHIMPF Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment...