... jUN 0 91994D * F ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF ... 16. PRICE COOE ac-Impedance, Chromate, Aluminum Alloys 17. ...
DTIC Science & Technology
... of a Scanning Electrochemical Impedance Spectroscopy Technique ... This article describes a method of generating ... by driving an ac current between ...
... inhibition was studied using impedance spectroscopy and potentiodynamic methods. Results obtained from the AC impedance measurements are ...
This paper reports on a local electrochemical impedance spectroscopy (LEIS) technique for mapping the ac impedance distribution, as a function of frequency, of an electrode. In LEIS, as in traditional ac impedance methods, a sinusoidal voltage perturbation between the ...
Energy Citations Database
Infrared spectroscopy is used to characterize the molecular structure and orientation of acetonitrile adsorbed at the Au/aqueous solution interface. AC impedance measurements are used to determine the stoichiometry and energetics of the adsorption process...
National Technical Information Service (NTIS)
AC four-point impedance spectroscopy has been applied to Nb-doped SrTiO{sub 3} bicrystals. Due to the simplified geometry and highly conductive bulk of the bicrystal, the reference impedance of the electrode was significantly reduced, validating the applicability of ac four-point ...
Recently, the authors have proposed a method for generating local electrochemical impedance maps of electrodes. In this technique impedance maps, at each frequency of interest, are generated by measuring the ratio of ac solution current density, very near...
Performance of lithium-ion batteries at low temperatures and/or high rates is relatively poor due to high cell internal impedance. The ac impedance spectroscopy was utilized to determine the impedance characteristics of lithium- ion cells as a function of...
In the present investigation, Electrochemical Impedance Spectroscopy (EIS) was used ... range of 100 kHz to 0.01 Hz, with 10 mV AC amplitude. ..... Techniques in the Space Transportation System (Space Shuttle) Launch Environment," ...
NASA Website
... Title : AC IMPEDANCE MEASUREMENT OF ENVIRONMENTAL ... OF INTERFACIAL IMPEDANCE MEASUREMENT ARE ... OF THE METHOD IN ...
... I Capacitive Behavior in Conducting Polymers: AC Impedance and Quartz Crystal Microbalance Studies by ... AC Impedance Analysis - ...
technique and alternating current (ac) impedance spectroscopy provides data on the corrosion resistance of alloys, performance of corrosion inhibitors, ...
Ac impedance spectroscopy has been used to measure the dynamic response of two types of porous gas-diffusion oxygen electrodes in a sulfuric acid electrolyte. Models were developed based on flooded and on thin-film pore structure. The transfer functions of these structures were calculated and the impedance result ...
The author attended the First International Symposium on Electrochemical Impedance Spectroscopy and presented an invited lecture on the theory of ac impedance of rough electrode-electrolyte interfaces. After the symposium the author spent four days at Ecole Polytechnique, Palaiseau, on the outskirt of Paris to give ...
... BY DC AN AC ELECTROCHEMICAL TECHNIQUES AS COMPARED ... IMPEDANCE DIAGRAMS SHOW THAT A SLIGHTLY ...
... REPORTED. THE BACKGROUND AND VARIOUS METHODS OF ANALYSIS OF AC IMPEDANCE DATA ARE DISCUSSED. THE ...
... Abstract : Experimental approaches for recording ac impedance data are ... Additional methods for analysis of experimental impedance data are ...
The electrical conductivity of double stranded DNA is investigated with ac impedance spectroscopy. Atomic force microscopy is used to provide images of the DNA molecules stretched over some gap electrodes through a flow cell. More stretched DNA molecules result in smaller charge-transfer resistances in the ac ...
NASA Astrophysics Data System (ADS)
This article describes a new measurement technique that utilizes impedance spectroscopy for the characterization of thermoelectric materials and devices. Two circuit models were developed and used to help explain the impedance spectroscopy data using transmission line theory and a coupled electrothermal model. Two ...
PubMed
In this paper the kinetics of the insertion of Na into the layered Na[sub x]Mo[sub 2]O[sub 4] system upon charge and discharge is studied by means of ac-complex impedance spectroscopy. The Na diffusion coefficient values deduced correlate well with the structural modifications occurring in these monoclinic molybdates upon Na ...
Lithium batteries are some of the best candidates for use as high energy density batteries and have been widely studied. Electrodeposited lithium was evaluated by ac impedance measurement and optical microscopy in two solutions containing LiClO[sub 4]; a propylene carbonate (PC) solution and a blended solution consisting of PC and 1,2-dimethoxyethane (DME) ...
AC impedance spectroscopy and chronopotentiometry have been used to study solid-state ionic conductors. Results obtained using three electrodes are compared to those using a two-electrode configuration. The uncompensated resistance was shown to depend str...
General considerations in nonlinear least squares fitting of small-signal ac frequency response data (conductive or dielectric systems) are first discussed. A very general and flexible complex nonlinear least squares fitting (CNLS) program (LOMFP) is desc...
... Title : APPLYING AC IMPEDANCE ELECTROCHEMICAL METHODS TO CORROSION TESTING COBALT ALLOY MEDIA. Corporate Author : ...
... Title : Simulation of Electrochemical Impedance Spectroscopy Response to Coating Flaws, or A Step Towards Predicting Corrosion. ...
... Title : A Corrosion Monitor Based on Impedance Method,. ... were performed on the impedance characteristics of ... the aid of a new ac corrosion monitor. ...
Single wall carbon nanotube (SWNT) networks of different loadings were measured by impedance spectroscopy. The resistances of the junctions and bundles have been separated by modeling ac impedance spectroscopy data to an equivalent circuit of two parallel resistance-capacitance elements in ...
The use of impedance spectroscopy to evaluate transdermal drug delivery is discussed and new techniques and protocols are suggested to avoid or minimize potential problems. A novel multichannel impedance analyzer, exploiting the advantages of the "three-electrode" configuration, was employed to measure the effects of differing ...
... IS BASED ON AN AC METHOD KNOWN IN ... WHEN AC CURRENT FLOWS THROUGH THE SYSTEM, IT ... LAYER AND AN IMPEDANCE OF THE ...
... Title : AC MAGNETIC FIELDS IN THE ... CALCULATIONS OF THE IMPEDANCE OF A ... IS ACCOMPLISHED BY TWO INDEPENDENT METHODS. ...
The aim of this paper is to address three issues in solid oxide fuel cells: (1) cross-validation of the polarization of a single cell measured using both dc and ac approaches, (2) the precise determination of the total areal specific resistance (ASR), and (3) understanding cathode polarization with LSCF cathodes. The ASR of a solid oxide fuel cell is a dynamic property, ...
Poly(butylenes adipate) ionomers (PBAi) were synthesized using dimethyl 5-sulfoisophthalate sodium salt (DMSI) up to 5 mol% of diacid monomer. We have investigated electrical and dielectric properties of the ionomers to evaluate alternating current (AC) parameters such as impedance, conductance, dielectric constant, admittance, susceptance, dielectric ...
The power efficiency of silicon nanocrystal light-emitting devices is studied in alternating current (ac) regime. An experimental method based on impedance spectroscopy is proposed. The power efficiency in ac regime is higher than the one measured in direct current before a threshold frequency and decreases ...
Recently, the authors have proposed a method for generating local electrochemical impedance maps of electrodes. In this technique impedance maps, at each frequency of interest, are generated by measuring the ratio of ac solution current density, very near the electrode, to the applied potential is measured as a function of position. A ...
DOE Information Bridge
This review describes recent advances in electrochemical impedance spectroscopy (EIS) with an emphasis on its novel applications to various electrochemistry-related problems. Section 1 discusses the development of new EIS techniques to reduce measurement time. For this purpose, various forms of multisine EIS techniques were first developed via a noise ...
In the present study the tool of impedance spectroscopy was utilized to characterize dielectric behavior of ferroelectromagnetic ceramics of Bi9Fe5Ti3O27 composition fabricated by hot pressing method from the stoichiometric mixture of oxides Bi2O3, TiO2 and Fe2O3. Impedance spectroscopy was applied to characterize ...
Nickel-copper alloy modified glassy carbon electrodes (GC/NiCu) prepared by galvanostatic deposition were used for the electrocatalytic oxidation of glucose in alkaline solutions. The electro-oxidation of glucose in a 1 M NaOH solution at different concentration of glucose was studied by the method of ac-impedance spectroscopy. The ...
The ac impedance spectra of polymer electrolyte fuel cell (PEFC) cathodes measured under various experimental conditions are analyzed. The measurements were carried out in the presence of large dc currents. The impedance spectrum of the air cathode is shown to contain two features: a higher frequency loop or arc determined by ...
BaBiO3-doped BaTiO3 (BB�BT) ceramic, as a candidate for lead-free positive temperature coefficient of resistivity (PTCR) materials with a higher Curie temperature, has been synthesized in air by a conventional sintering technique. The temperature dependence of resistivity shows that the phase transition of the PTC thermistor ceramic occurs at the Curie temperature, Tc = 155 �C, which is higher ...
... Descriptors : *IMPEDANCE, *VOLTAMMETRY, *POLYANILINES, *CONDUCTIVE POLYMERS, CONDUCTIVITY, SPECTROSCOPY, SYNTHESIS ...
In the present investigation, holographic interferometry was utilized for the first time to measure the alternating current (A.C.) impedance of aluminum samples during the initial stage of anodization processes in aqueous solution without any physical contact. The anodization process (oxidation) of the aluminum samples was carried out chemically in ...
... TR-2004(8555)-2 AC Impedance Testing on 40-Ah Li-Ion Cells 20 October 2004 ... AC Impedance Testing on 40-Ah Li-on Cells 5b. GRANT NUMBER ...
Impedance spectroscopy has been used to study the effect of kaolinite grain sizes on the AC electrical properties of kaolinite/polystyrene composites under different temperatures and applied frequencies. Impedance measurements were performed on prepared composites containing 20% kaolinite mineral of grain sizes 63, ...
This paper introduces a simple portable dual analyzer which allows real-time ac-impedance measurements and noise spectroscopic analysis simultaneously, employing one or two data acquisition systems together with a low noise current-to-voltage preamplifier. The input signal composed of numerous selected frequencies of sinusoidal voltages with a dc bias was applied to a device ...
... study is to determine the viability of electrochemical impedance spectroscopy (EIS) as an accelerated testing procedure for ... ...
NBII National Biological Information Infrastructure
Electrochemical impedance spectroscopy (EIS) is a non-destructive technique often used to understand
NASA Technical Reports Server (NTRS)
... for Al Alloys Using Electrochemical Impedance Spectroscopy ... Alloys Using Electrochemical Impedance Spectroscopy By..... ...
... and DC electrochemical techniques have verified that the low-frequency impedance spectrum obtained from the AC Impedance technique is ...
... and DC electrochemical techniques, have verified that the low-frequency impedance spectrum obtained from the AC Impedance technique is ...
... Methods of obtaining the complete negative resistance ... amplifier load impedance effects the input impedance. ... be evaluated at the ac frequencies of ...
... was examined by applying the methods described below. ... Electrochemical Measurements: Alternating current (AC) impedance measurements were ...
... Abstract : Electrochemical techniques for predicting stress corrosion cracking (SCC ... potentials with continuous recording of the ac impedance in a ...
... Abstract : Two in situ techniques, dynamic imaging ... LEIS is an electrochemical impedance technique that generates local ac impedance data by ...
... of the ac impedance at a metal-electrolyte interface as a function of frequency are depicted, and recently developed measurement techniques are ...
... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...
Over the last century a number of techniques have been developed which allow the measurement of the dielectric properties of biological particles in fluid suspension. The majority of these techniques are limited by the fact that they only provide an average value for the dielectric properties of a collection of particles. More recently, with the advent of microfabrication techniques and the ...
... electrochemistry of titanium in the LiCl-KCl eutectic melt has been investigated by means of pulse techniques and ac impedance measurements. ...
... Accession Number : ADD854901. Title : Inductance Effect in the AC Impedance of Conducting Polypyrrole Films. Descriptive Note : Journal article,. ...
... TECHNICAL REPORT NATICK/TR-93/019 AD ALTERNATING CURRENT (AC) IMPEDANCE TESTING OF COATED TRAYCANS By Kurt Lawson ...
... Accession Number : ADA261256. Title : Alternating Current (AC) Impedance Testing of Coated Traycans. Descriptive Note : Final rept. ...
... Title : Ac Impedance Investigation of Ta2O5 Film for Use as a Storage Capacitor Dielectric. Descriptive Note : Journal article,. ...
... Abstract : Although ac impedance has come to prominence lately for studying anti ... At first sight this is surprising since the techniques are very ...
... Accession Number : ADA428218. Title : AC Impedance Testing on 40-Ah Li-Ion Cells. Descriptive Note : Technical rept. ...
... Accession Number : ADD854551. Title : AC Impedance Method for High-Resistivity Measurements of Silicon. Descriptive Note : Journal article,. ...
... Title : AC Impedance Analysis of Corrosion Fatigue in Naval Aircraft Alloys. ... this program is to develop rapid electrochemical methods for evaluating ...
... Title : AC IMPEDANCE INVESTIGATION OF TA(2)O(5) FILM FOR USE AS A STORAGE CAPACITOR DIELECTRIC. Corporate Author : ...
The behavior of a semiconductor contact is usually represented by the specific contact resistance determined by a dc measurement. A copper-gold contact on p-type cadmium telluride is used to illustrate the influence of the ac contact impedance on standard semiconductor measurements such as capacitance versus voltage, admittance ...
Corrosion of steel during oil well acidizing or acid pickling treatments can be controlled effectively and economically with corrosion inhibitors. It is generally accepted that these additives function by forming an adherent barrier on the steel surface, the nature of which depends on various physiochemical properties of the inhibitor. Work to date has established that acetylenic alcohols first ...
One of the age-related changes occurring in dentine structure is the formation of peritubular dentine on the inner walls of dentinal tubules leading to complete closure of tubules. Ac-impedance is safe, fast and non-invasive technique. In the last decade, the popularity of the technique has increased in dental research. Several investigators have used the technique to detect ...
Impedance spectroscopy is often used to analyse the electrical properties of ceramic materials having high-resistive grain boundaries, such as ZnO and SrTiO{sub 3}. Fewer attempts have been made at using this technique for the analysis of inhomogeneous electronic ceramics consisting of grains with differing composition, such as those occurring in negative ...
A new application using barium strontium titanate (BST) thin films to fabricate the Pd/BST/Pt heterostructure for hydrogen gas detection has been investigated. To further understand the mechanism of this novel hydrogen sensing properties, impedance spectroscopy of the Pd/BST/Pt has been systematically studied and interpreted satisfactorily based on an ...
A polythelene glycol (PEG) polymer was synthesized using a dip coating procedure on 316L stainless steel (SS) substrate pre coated by radio frequency RF inductively coupled plasma polymerization with di (ethylene glycol) vinyl ether (EO2V) monomer that was used as a primer coat. The primer and PEG composite film was studied with profilometer, visible-light microscope, scanning electron microscope ...
A polyethylene glycol (PEG) polymer was synthesized using a dip coating procedure on 316L stainless steel (SS) substrate pre-coated with a primer that consisted of radio frequency RF inductively coupled plasma-polymerized di (ethylene glycol) vinyl ether (EO2V). The primer and PEG composite film was studied with profilometer, optical microscope, scanning electron microscope (SEM), and a tape test ...
... in the AC Response of an ... LEAST SQUARES METHOD, CHARGE TRANSFER ... COEFFICIENT, EQUATIONS, IMPEDANCE, BINARY COMPOUNDS. ...
... Title : Measurement of Low Corrosion Rates: Comparison of ac Impedance and Thin Layer Activation Methods,. Corporate Author : ...
... Assisted DC and AC Techniques in Electrochemical ... data acquisition and calculation method, allows the ... Impedance measurements give the same ...
Electrochemical impedance spectroscopy (EIS) is a non-destructive technique often used to understand ... the measured cell impedance in the form of real and ...
The ionic conductivity of YBa{sub 2}Cu{sub 3}O{sub x} has been determined from the Warburg impedance at the lowest end of a full impedance spectrum which was constructed by combining a partial spectrum directly measured by ac impedance spectroscopy and the Fourier-Laplace transform of dc ...
A comprehensive study has been undertaken to investigate the ability of AC-impedance spectroscopy (AC-IS) to non-destructively monitor the fiber dispersion of conductive fiber-reinforced cement-based materials. Previous work showed that AC-IS effectively monitors various fiber dispersion issues in lab-scale steel ...
Complex impedance measurements were carried out for Mn1+xFe2-2xTixO4 in the frequency range 42 Hz-5 MHz prepared using solid-state reaction method. The conduction processes in the samples have been modeled in the form of an equivalent circuit made up of a series combination of two parallel RC circuit attributed to grain and grain boundaries. The dc conductivity is obtained by ...
The frequency behaviour of the electrical properties of field-aligned CrO2 needle-shape powders has been investigated by the impedance spectroscopy method. The low frequencies R(f) increase with increasing ?, the angles between the applied current direction and the easy axis of the aligned samples. The specific frequency, of which a maximum -X(f) occurred, ...
... DC AND AC TECHNIQUES WHICH CAN ... THE EXTRAPOLATION METHOD OF TAFEL ... MEASUREMENTS AND IMPEDANCE MEASUREMENTS ...
