Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric ...
PubMed Central
, universal decay of the mobility with bulk concentration c0, observed in KCl for ACEO micropumps [11. Lett. 100 058302 [10] Olesen L H, Bruus H and Ajdari A 2006 AC electrokinetic micropumps: the effect and Chang H C 2004 Electrokinetic micropump and micromixer design ...
E-print Network
bearings will be important in the development of micro- coolers, micropumps, microgenerators, and other
and proteins. AC electroosmotic flow can be utilized to create micropumps for micro-bio- chips [1]. As a result electroosmotic micropumps. ICEO [4] refers to a phenomenon in which a DC or AC electric field induces charge electrokinetic micropumps: The effect of geometrical ...
unsuitable for biological applica- tions. Due to such drawbacks, the use of electrokinetic EK micropumps- clude dc and ac micropumps. In a dc pump electro-osmotic EO flow is induced by an external tangential of directed flow over the activated micropump. For more information on EPAPS, see ...
PubMed
concentrator, micro-pumps and mixers by ACEO. Electro-osmosis typically refers to using DC potential to moving is important for optimizing the micropump and particle transportation. In contrast to electrophoretic AC Electrochemical Micropump, AIChE annual meeting 2004, Nov. 7 � 12, Austin, TX. 361 #12;
DESIGN AND MODELING OF A PETAL-SHAPE, CONJUGATED POLYMER-ACTUATED MICROPUMP Yang Fang and Xiaobo the micropump, it is important to make the prototypes of different diaphragms for comparisons and predict the performance of the micropump. In this paper, a petal-shape design is proposed for the pump- Proceedings
--We have developed micropumps for microfluidics that use AC electric fields to drive aqueous fluid motion, micropump I. INTRODUCTION Electrokinetic phenomena are important at micro/nanoscales, and can be used micropumps by taking advantage of these phenomena. IMECE2004-61836 2004 ASME ...
Recent experiments have demonstrated that AC electrokinetic micropumps permit integrable, local, and fast pumping (velocities � mm/s) with low driving voltage of a few volts only. However, they also displayed many quantitative and qualitative discrepancies with existing theories. We therefore extend the latter theories to account for ...
NASA Astrophysics Data System (ADS)
This paper reports dramatic improvements in flow rate over conventional alternating current (ac) electrokinetic micropumps by exploiting asymmetry in electric potentials over the electrodes. A micropump consisting of a planar asymmetric electrode array was tested using ac signals with and ...
Lab-on-a-chip devices require integrated pumping and fluid control in microchannels. A recently developed mechanism that can produce fluid flow is an integrated ac-electro-osmosis micropump. However, like most electrokinetic pumps, ac-electro-osmotic pumps are incapable of handling backpressure as the pumping force ...
Recent experiments have demonstrated that ac electrokinetic micropumps permit integrable, local, and fast pumping (velocities �mm/s ) with low driving voltage of a few volts only. However, they also displayed many quantitative and qualitative discrepancies with existing theories. We therefore extend the latter theories to account ...
This paper investigates the phenomenon of Faradaic charging in ac electrokinetics. Faradaic reactions were suggested as a key effect responsible for the reversal of pumping direction in ac micropumps. However, this hypothesis has yet to be proven convincingly and directly. Here we present an ion detection strategy ...
ac electro-osmosis (ACEO) has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and electrokinetic surface flows can be induced by nonuniform electrical fields. To implement ACEO ...
. A slip silicone cover (SA8R-0.5, Grace Bio-Labs, USA) is sealed on the glass slide to form the chamber Erms is applied over a fluid body, energy is dissipated as 2 rmsEP = ( : electrolyte conductivity at high frequency. ACET effect occurs owing to the resistive property of the fluid, so its flow velocity
A microfluidic pump and mixer design based on ac faradaic polarization is proposed. Unlike ac electrokinetic devices based on capacitive charging of the electrodes, the design yields a net electro-osmotic flow for high-conductivity electrolytes at high voltages and frequencies without producing gas bubbles or generating pH gradients. ...
An AC electrokinetic funnel flow is generated by a planar micro-coil resister design capable of sustaining 3500V without Faradaic reactions. The final line of the serpentine coil exhibits a transverse electro-osmotic slip velocity exceeding 1 cm/sec. Due to side boundaries, a large back pressure is established in the slip direction to produce an intense ...
An AC Magnetohydrodynamic (MHD) micropump has been demonstrated in which the Lorentz force is used to propel an electrolytic solution along a microchannel etched in silicon. This micropump has no moving parts, produces a continuous (not pulsatile) flow, and is compatible with solutions containing biological specimens. ...
DOE Information Bridge
AC electrokinetics has shown great potential for microfluidic functions such as pumping, mixing and concentrating particles. So far, electrokinetics are typically applied on fluids that are not too conductive (<0.02 S/m), which excludes most biofluidic applications. To solve this problem, this paper seeks to apply ...
We have built a dedicated lab on a chip to study the performance of an integrated electrokinetic micropump, driven by a low voltage AC signal. This micropump consists of an array of interdigitated electrodes and is here integrated in a microfluidic loop. We demonstrate that this device can pump continuously and ...
[7,8]. Fig. 1. Principle of bubble valve for micro injector [7,8] Fig. 2. Valveless micropump using. Colgate, "Preliminary Investigation of Micropumping Based on Electrical Control of Interfacial Tension
pumps,18,19 or catalytic micropumps.20,21 Some of these micropumps, however, are difficult to fabricate. Alternating current (AC) field micropumps have been reported that create net flow over asymmetric electrode on both sides of the channel creates a micropump that is powered by the global ...
ii The goal of the present thesis has been to investigate ways of controlling and manipulating fluids and suspensions in microfluidic systems. In particular, we focus on a theoretical description of AC electroosmotic micropumps with asymmetric electrode arrays, that have recently been demonstrated to permit fast pumping (velocities ? mm/s) with low driving ...
PROOF COPY 072415JAP PROOF COPY 072415JAP Electrokinetic micropump and micromixer design based.1063/1.1767286] I. INTRODUCTION Because mechanical micropumps with moving parts are prone to frictional wear be nonuniform such that vortices are created. Hence, both dc micropumps and dc micromixers can be fabricated
a method to measure the flow rate through microfluidic components and systems, including micropumps including micropumps and microvalves.1�7 For low pressure gradient flow (e.g., electrokinetic flow), methods. Microeng., 1994, 4, 4, 157�171. 4 D. J. Laser and J. G. Santiago, A review of micropumps, J. Micromech
-21. Other Publications 1. Dutta, P., 2005, "Development of Electrokinetic Micropump for Insect Traps," Final Report, Sterling International Inc, Spokane Valley, WA. 2. Dutta, P., 2005, "A Non-mechanical Micropump, Fabrication and Characterization of Micropump," Final Report, Washington State University Office of ...
We have developed 2 different micropumping methods for transporting ionic fluids through microchannels. The first method is based on Induced Charge Electroosmosis (ICEO) and AC flow field-effect. We used an AC electric field to produce a symmetric ICEO flow on a planar electrode, called `gate'. In order to break the symmetry of ICEO, ...
We are developing AC electrokinetic micropumps to drive electrically conductive biological fluids in microchannels. These pumps work on the principles of Induced Charge Electroosmosis (ICEO) and flow Field Effect Transistor (flowFET) phenomena. AC (as well as DC) electric fields can induce electrical double layer ...
Micropumping of biofluids by alternating current electrothermal effects Jie Wu,a Meng Lian, and Kai, effective micropumping and mixing still remain a challenge. Due to high surface/volume ratio at microscale fluids. Here we report a type of micropumps by ac electrothermal ACET effect. Pumping was demonstrated
The control and handling of fluids and fluid-based samples is central to the majority of applications in the areas of Micro Analysis systems and the Lab-on-a-chip. As a result, there is a great deal of research and industrial interest in developing specific technologies for this purpose: micropumps, micromixers, microstirrers, etc. One widely used technology in these systems ...
1 Supplementary Information Remotely Powered Self-Propelling Particles and Micropumps Based-268. [4] Debesset, S; Hayden, CJ; Dalton, C; Eijkel, JCT; Manz, A; An AC electroosmotic micropump
. F. Bohringer, "A Ferrofluidic Magnetic Micropump," J. Microelectromech. Syst., vol. 10, pp. 215�221, 2001. [22] A. V. Lemoff and A. P. Lee, "An ac magnetohydrodynamic micropump," Sensors Actuators B, vol magnetohydrodynamic micropump," Sensors Actuators A, vol. 80, pp. 84�89, 2000. [24] P. H. Paul, D. W. ...
fluids, charged species and polarizable particles. DC electroosmotic micropumps [1, 2] have been employed injections in their analysis of ac electroosmotic micropumps. Induced charge electroosmosis (ICEO) refers micropumps. Sensors and Actuators B- Chemical, 2001. 79(2-3): p. 107-114. 3. Jacobson, S.C., et al., ...
to stabilize larger volumes (cf Sect. 3). The micropump was programmed by an external com- puter, which triggered the pumping start, controlled its flux and its duration. The micropump was automatically started-coating (b)(a) 10mm micropump Injector tube Fig. 1 a Vertical cross section of the injector tube. b Quasi
... 39. Debesset, S., Hayden, CJ, Dalton, C., Eijkel, JCT & Manz, A. An AC electroosmotic micropump for circular chromatographic applications. ...
DTIC Science & Technology
This review surveys the advances of microvalves, micropumps, and micromixers within PCR microfluidic chips over the past ten years. First, the types of microvalves in PCR chips are discussed, including active and passive microvalves. The active microvalves are subdivided into mechanical (thermopneumatic and shape memory alloy), non-mechanical (hydrogel, sol-gel, paraffin, and ...
Alternating current (AC) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform AC electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, AC-electroosmosis, and Brownian ...
... 4. TITLE AND SUBTITLE Biosensor Assay Enhancement Through Ac ... useful in portable field-based medical biosensors, or environmental, or food ...
Alternating current (ac) electrokinetic motion of colloidal particles suspended in an aqueous medium and subjected to a spatially nonuniform ac electric field are examined using a simple theoretical model that considers the relative magnitudes of dielectrophoresis, electrophoresis, ac-electroosmosis, and Brownian ...
A microfluidic pump based on electroosmosis of the second kind was designed and fabricated. Experimental results using DC and AC voltages showed a close to second-order relationship between flow and voltage, in good agreement with theory. The experimental flow rates were considerably lower than the predicted maximum for the micropumps, which can be ...
We have designed and fabricated novel electrokinetic micropumps for producing unidirectional flows in microchannels. These pumps utilize very small voltages (15 Volts) to create significant flow velocities (100 microns/s). Low voltages reduce the problem of electrolysis and bubble formation inside the microchannels. One type of the pump is based on DC ...
In this paper, it is described that measurement of fluid flow generated by simultaneous operation of an infrared (IR) laser and AC electric field in a microfabricated channel. When an IR laser (1026 nm) was focused under an intense AC electric field, a circulating flow was generated around the laser focus. The IR laser and the electric field generate two ...
Electrokinetic techniques continue to play a leading role in technologies ranging from nanoparticle characterization and directed electronics assembly to micropumps and micromixers to biosensors and DNA sequencing. In this session, we invite submissions related to the development of new technologies in any of these areas, from both the fundamental and ...
Numerical simulations were made of a micro-pump with step electrodes. An AC voltage was applied to each pair of step electrodes. The existing numerical studies using linear assumptions have a limitation that the theory is limited to low external voltage, at most 25mV. However, the present study took into account the Steric effect which is recognized as a ...
Microfluidic systems are part of an emerging technology which deals with minute amounts of liquids (biological samples and reagents) on a small scale. They are fast, compact and can be made into a highly integrated system to deliver sample purification, separation, reaction, immobilization, labelling, as well as detection, thus are promising for applications such as lab-on-a-chip and handheld ...
... microstirring is a tool that can be incorporated in existing devices, to speed up, for example, food-borne pathogen detection, or portable medical ...
Khusid geyt Tantsn (klezmer) � Adolf Schreiner (1847-1921), Immer Kleiner Aldert Prast, accordeon, en
Electrokinetic boundary conditions are derived for ac electrokinetic phenomena over leaky dielectric (i.e., semiconducting) surfaces. Such boundary conditions correlate the electric potentials across a semiconductor-electrolyte interface (consisting of an electric double layer inside the electrolyte solution and a space charge layer ...
The field of AC electrokinetics is rapidly growing due to its ability to perform dynamic fluid and particle manipulation on the micro- and nano-scale, which is essential for Lab-on-a-Chip applications. AC electrokinetic phenomena use electric fields to generate forces that act on fluids or suspended particles ...
A microstirring tool is developed to improve binding rates in biosensor devices by an order of magnitude. AC electric fields generate fluid motion through the well documented but unexploited phenomenon, Electrothermal Flow, where the circulating flow redi...
National Technical Information Service (NTIS)
Microfluidic devices (e.g. Labs on a Chip) are becoming useful scientific and medical tools for automating chemical and biological lab work. Various impediments prevent complex microfluidic devices from being easily removed from a laboratory setting, limiting their utility for day-to-day applications like in-the-field medical diagnostics and drug delivery. The development of portable and ...
Electrokinetics is a leading mechanism for transport and separation of biochemical samples in microdevices due to its favorable scaling at small scales. However, electrokinetic systems can become highly unstable, and this instability adversely affects key processes such as sample stacking and electrophoretic separation. This dissertation deals with two ...
For a dielectric solid surrounded by an electrolyte and positioned inside an externally biased parallel-plate capacitor, we study numerically how the resulting induced-charge electro-osmotic (ICEO) flow depends on the topology and shape of the dielectric solid. In particular, we extend existing conventional electrokinetic models with an artificial design field to describe the ...
A novel conductivity-based interface tracking method is developed for 'lab-on-a-chip' applications to measure the velocity of the liquid-gas boundary during the filling process. This interface tracking system consists of two basic components: a fluidic circuit and an electronic circuit. The fluidic circuit is composed of a microchannel network where a number of very thin electrodes are placed in ...
The AC electrokinetic movement of fluids has its origin in two different physical mechanisms: AC electroosmosis, the interaction of the Electrical Double Layer induced on microelectrodes by an applied potential and the generated electric field; and electrothermal Electro-hydrodynamics, the interaction of an electric field with ...
The area of 'laboratory-on-a-chip', miniaturised or microfluidic analysis systems, is a rapidly developing field. At the microscale, electrokinetic processes become enhanced, and the advent of AC electrokinetics (EK) in recent years further promotes the development of electrokinetic devices for microfluidics. ACEK ...
The kinesin-microtubule system plays an important role in intracellular transport and is a model system for integrating biomotor-driven transport into microengineered devices. AC electrokinetics provides a novel tool for manipulating and organizing microtubules in solution, enabling new experimental geometries for investigating and controlling the ...
We present two different designs of electrohydrodynamic micropumps for microfluidic systems. The micropumps have no movable parts, and their simple design allows for fabrication by microsystems technology. The pumps are operated by ac voltages from 1to60V and were tested with aqueous solutions in the conductivity range of 1-112mSm?1 ...
We present two different designs of electrohydrodynamic micropumps for microfluidic systems. The micropumps have no movable parts, and their simple design allows for fabrication by microsystems technology. The pumps are operated by ac voltages from 1 to 60 V and were tested with aqueous solutions in the conductivity range of 1-112 mS ...
This Special Topic section is a compilation of several original contributions covering both fundamental and practical aspects of electrokinetic microfluidic phenomena that were presented during the Electrokinetics and Microfluidics sessions held at the conference. PMID:20644663
This Special Topic section is a compilation of several original contributions covering both fundamental and practical aspects of electrokinetic microfluidic phenomena that were presented during the Electrokinetics and Microfluidics sessions held at the conference.
We present the design, test and theoretical analysis of a novel micropump. The purpose is to make a pump with large flow rate (approximately 10 microL min-1) and high pressure capacity (approximately 1 bar) powered by a low voltage DeltaV<30 V. The pump is operated in AC mode with an electroosmotic actuator in connection with a full wave rectifying ...
A micropumping device has been developed, which may find application in different areas such as blood pumping and chemical reagents dosing in bioengineering or as an efficient thermal management solution scheme in space-constrained electronic devices, due to some of their unique properties such as lower noise generation and ease of miniaturization. In this presentation, liquid ...
intensive. Such baffles are also problematic in chips that employ electroosmosis or electrophoresis as high than the linear scaling of the standard electroosmosis. Dukhin7 first offered an estimate to a combination of channel electroosmosis and the pH-gradient-induced backflows, is less significant than that due
AC electrokinetics is rapidly becoming a foundational tool for lab-on-a-chip systems due to its versatility and the simplicity of the components capable of generating them. Predicting the behavior of fluids and particles under non-uniform AC electric fields is important for the design of next generation devices. Though there are ...
This paper deals with the mathematical modeling of traveling-wave ac electro-osmotic micropumps with a zig-zag arrangement of microelectrodes. A mathematical model based on the Poisson-Nernst-Planck-Navier-Stokes description is used in this study within the physically relevant ranges of the model parameters. We present an extensive set of parametrical ...
We demonstrate an opto-electrokinetic technique for non-invasive particle manipulation on the surface of a parallel-plate indium tin oxide (ITO) electrode that is biased with an alternating current (AC) signal and illuminated with near-infrared (1064 nm) optical landscapes. This technique can generate strong microfluidic vortices at higher ...
The medical devices such as a micropump to extract blood through a tube have a structure which needle and pump part are mutually separated. Therefore, it is not easy to make smaller than the conventional pump. In this research, we aim to develop the pump combined with a tube as a final purpose. In this study, ring type PZT elements are mounted on the surface of the silicone ...
An all-polymer micropump was realized using the conductive polymer poly (3,4-ethylenedioxythiophene) (PEDT) as the active component. The pumping effect originated from an ac potential applied to an asymmetric array of interdigitated electrodes. The PEDT electrodes were fabricated using optical lithography and reactive ion etching, and dimensions down to 2 ...
Micelles and polymers vesicles have been of increasing interest as drug delivery systems for controlled release, specific cell targeting, and medical diagnostics. In addition, AC-electrokinetic techniques have emerged as a viable option for colloidal and biocolloidal manipulation. In this work, we examine the dielectrophoresis (DEP) characteristics of complex micellar ...
This study reports a hybrid electrokinetic technique for label-free manipulation of pathogenic bacteria in biological samples toward medical diagnostic applications. While most electrokinetic techniques only function in low-conductivity buffers, hybrid electrokinetics enables effective operation in high-conductivity samples, such as ...
This study reports improved electrokinetically driven microfluidic T-mixers to enhance their mixing efficiency. Enhancement of electrokinetic microfluidic T-mixers is achieved using (i) an active approach of utilizing a pulsating EOF, and (ii) a passive approach of using the channel geometry effect with patterned blocks. PDMS-based ...
TrFE)] copolymer, based actuation micropump diaphragm (PAMPD) have been ... A lot of micropumps have been developed using several actuation methods such as ...
NASA Website
micropump which will be converted to a high pressure rise, long ... applications that require reliable, efficient micropumps include chemical ...
An ac electric field is applied to induce particle and fluid motion in a wedge-shaped microchannel. Micron-resolution particle image velocimetry (?-PIV) is used to determine spatially resolved particle velocity and fluid velocity fields. Under steady-state conditions, the particles experience a balance between dielectrophoretic forces induced by the nonuniform electric field ...
Moving and manipulating bio-particles and fluids on the microscale is central to many lab-on-a-chip applications. Techniques for pumping fluids which use electric fields have shown promise using both DC and AC voltages. AC techniques, however, require the use of integrated metal electrodes which have a low resistance but can suffer from unwanted chemical ...
Electric field guided assembly of colloids is a new area of research in colloidal science where sub-micrometer particles, or colloids, are assembled using patterned electrodes. The design of these devices is often limited by an inability to characterize accurately forces and fluxes with linearized electrokinetic theory. The research presented in this dissertation describes an ...
� ample, the operating frequency of a micropump chamber may be limited by the feasibility of phys� ical the behavior of the micropump since it determines the micropump flow rate. The major parts of the check valve h s L h Figure 2: Schematic view of the open valve of a micropump. The behavior of the cantilever
Analytical analysis of a circular PZT actuator for valveless micropumps Shifeng Li, Shaochen Chen the behavior of a piezoelectric microactuator for micropump applications. However, there is no reliable micropump. In this paper, a linear strain distribution is assumed across the thickness of the passive plate
Microchannels, Micropumps, and. Integrated microcooling system. Silicon wafer ... of micropump technology. "02: Design, fabrication and testing of complete ...
... Punp ..... 28 6.4 Micropump Gear Type Fuel Pump ..... 28 ... by Micropump which will be discussed later. ...
It is important to generate fast fluid flow yet maintain low temperature rise for ac electrothermal (ac ET) pumping in microsystems with conductive fluids. This has been generally the limitation of ac ET driven micropump applications. We present an enhanced ac ET pumping mechanism using low ...
The work presents the design of an integrated system consisting of a high-pressure electroosmotic (EO) micropump and a microporous monolithic emitter, which together generate a stable and robust electrospray. Both the micropump and electrospray emitter are fabricated using a sol-gel process. Upon application of an electric potential of sufficient amplitude ...
Rapid cell separation and collection is demonstrated through the integration of electrokinetic pumps, dielectrophoretic (DEP) traps and field driven valves into a well designed microfluidic channel loop. We present the ground-up design and analysis of this fully functional microfluidic device for the rapid separation and collection of live and dead yeast cells and malaria red ...
Removal of Cu, Cr and As from utility poles treated with chromated copper arsenate (CCA) was investigated using different one- to three-step combinations of oxalic acid extraction and electrokinetic treatment. The experiments were carried out at room temperature, using 0.8% oxalic acid and 30 V (200 V/m) of direct current (DC) or alternating current in combination ...
Various electrokinetic phenomena in microfluidics have been utilised to manipulate microfluids and particles for lab-on-a-chip applications. Microfluidic channels with traditional planar floor configuration designs have limited pumping efficiency due to the fast backward flow over the electrode surface. This study reports optimal design of a microchannel with a microgrooved ...
We have explored the role of electrokinetics in the spontaneous motion of platinum-gold nanorods suspended in hydrogen peroxide (H2O2) solutions that may arise from the bimetallic electrochemical decomposition of H2O2. The electrochemical decomposition pathway was confirmed by measuring the steady-state short-circuit current between platinum and gold interdigitated ...
We present here a study on overlooked aspects of alternating current (AC) electrokinetics-AC electrophoretic (ACEP) phenomena. The dynamics of a particle with both polarizability and net charges in a non-uniform AC electric trapping field is investigated. It is found that either electrophoretic (EP) or dielectrophoretic (DEP) effects ...
We present here a study on overlooked aspects of alternating current (AC) electrokinetics�AC electrophoretic (ACEP) phenomena. The dynamics of a particle with both polarizability and net charges in a non-uniform AC electric trapping field is investigated. It is found that either electrophoretic (EP) or dielectrophoretic (DEP) effects ...
Motivated by the growing interest in ac electroosmosis as a reliable no moving parts strategy to control fluid motion in microfluidic devices for biomedical applications, such as lab-on-a-chip, we study transient and steady-state electrokinetic phenomena (electroosmosis and streaming currents) in infinitely extended rectangular charged microchannels. With ...
The recognition and manipulation of biomolecules on the microscale is a fundamental requirement for the development of lab on a chip devices. AC electrokinetic approaches are ideally suited to manipulating particles in such systems. Unfortunately, these approaches cannot recognize isolated macromolecules with high discrimination because molecular ...
Iontophoretic and electroporation transdermal delivery modes of ionic drugs have been utilized in a number of clinical and biomedical devices. However, applications of these methods have been found challenging for the delivery of many non polar and high molecular weight clinically important drugs. The main goal of the present study is to investigate whether transdermal transport of non polar ...
In this work, we explore the rich AC-electrokinetic effects to manipulate micelles of varied chemical structures and examine their stability in response to applied AC-electric fields. We investigate the AC-field induced transport and instability of sodium dodecyl sulfate (SDS) micelles and cetyl trimethylammonium bromide (CTAB) ...
We demonstrate an optically induced electrokinetic technique that continuously concentrates nanoparticles on the surface of a parallel plate electrode that is biased with an AC signal. A highly focused beam of near-infrared light (1064 nm) was applied, inducing an electrothermal microfluidic vortex that carried nanoparticles to its center where they were ...
Micropumps are important components of advanced microfluidic systems. Here, polyimide (PI) as an advantageous structural material for flexible micropumps was focused on. This is because PI has many advantageous properties such as high thermal stability and superior mechanical strength. However, the difficulty in realizing an all-PI ...
Sensors and Actuators A 127 (2006) 94�103 CFD modeling of an ion-drag micropump J. Darabi, C an electrohydrodynamic (EHD) micropump. The micropump consists of an array of interdigitated electrodes along the top and bottom of the micropump channel. The focus of the simulations was to study the effects of electrode ...
/V Power/mW Electrostatic micropump35 200 1 Thermo-pneumatic36 15 450 Magnetohydrodynamic micropump37 10 18 Bubble-type planar micropump38 40 1000 Ionic conductive polymer film Micropump39 1.5 180 Electroactive. Kluge, M. Richter and A. Richter, A bidirectional silicon micropump, Sens. ...
Forces experienced by colloidal particles in an AC electric field such as dielectrophoresis (DEP) and AC electro-osmosis (ACEO) have been widely investigated for their application in microfluidic devices. In order to provide a more complete theoretical basis for such AC electrokinetic mechanisms, we propose a ...
The ability of electrokinetics to manipulate biological microparticles, such as cells and bacteria, has great applications in Lab-on-a-chip devices, and micro-total analysis systems (mTAS). In these methods, non-uniform AC electric fields interact with the dielectric properties of suspended biological microparticles to induce forces and torques on the ...
This paper reports on the integration of thick carbon-polydimethylsiloxane (C-PDMS) electrodes in microfluidic systems for electrokinetic operations. The C-PDMS material, obtained by mixing carbon nanopowder and PDMS, preserves PDMS processing properties such as O2 plasma activation and soft-lithography patternability in thick or 3D electrodes. Conductivity in the order of 10 ...
Microscale electrodes supplied with an AC field can generate rotational fluid patterns known as AC electroosmosis. In the present study, this effect was used to improve antibody binding on a biosensor surface. Antibodies, like many other large, slow moving biomolecules, tend to suffer from transport limitations during a reaction with a surface-bound ...
The classical theory of electrokinetic phenomena assumes a dilute solution of point-like ions in chemical equilibrium with a surface whose double-layer voltage is of order the thermal voltage, kBT/e=25 mV. In nonlinear 'induced-charge' electrokinetic phenomena, such as ac electro-osmosis, several volts ?100kBT/e are applied to the ...
Nonlinear electrokinetic pumps are attractive in the development of portable and flexible microfluidic analysis systems, since they operate without moving parts using low (battery powered) alternating potentials. Since the discovery of AC electro-osmosis (ACEO) in the late 1990s, there has been much work in designing and building two-dimensional, periodic ...
AC electrokinetic phenomena, i.e., electrorotation, dielectrophoresis and traveling wave dielectrophoresis, have gained an increasing amount of attention. This is due to their wide range of applications from cancer research to identifying and separating parasites, cell populations and viruses, and even to design of nanomotors. Despite the number of ...
Electrokinetic microstirring is used to improve the sensitivity of microfluidic heterogeneous immuno-sensors by enhancing the transport in diffusion-limited reactions. The AC electrokinetic force, Electrothermal Flow, is exploited to create a circular stirring fluid motion, thereby providing more binding opportunities between suspended ...
with electrokinetic flow [19]. Microvortices to rehomoge- nize the blood cell distribution can also be utilized. Work the loading of microliter of blood sample is the goal of our cur- rent efforts. Acknowledgments This work ac- knowledge the blood supply by Jason Gordon from Andre F. Palmer's group at Notre Dame. References
of moving parts and the favorable velocity profile have made electrokinetic means such as electroosmosis) electroosmosis, a series of novel techniques have been developed to generate bulk flow using ac fields electroosmosis has a number of applications in microfluidic and micro- electromechanical system (MEMS) devices.1
_final stable_final 1 1 10 20 R R R= ~ Nanostructured Nanofibers High Voltage Supplier Micropump Collector Shielded Heating Unit Guided Chamber with Heating Controller R High Voltage Supplier Micropump Collector
, micropumps and microvalves. These microstruc- tures (e.g. microfluidic) are divided in two different, and by operating them in different phases, a peristaltic micropump could be created � this is very useful in cases for electronic fertility control to micropumps for nanolitre drug delivery become foreseeable. The basic
Jan 22, 2011 ... dc.subject.other, peristaltics micropump valves flow metering eutectic bonding ... dc.title, Micropump Technology and Applications, en_US ...
Jan 22, 2011 ... Title: MicroPump Technology for Spacecraft and Commercial Applications. Authors: Hartly, F. T.. Issue Date: 21-Oct-1997 ...
through microchannels by a micropump. Microchannel heat exchangers have been ... and micropump technologies. This paper presents background on the need for ...
... 11 4.1.2 Water-Powered, Osmotic Micropump.....17 4.1 ... Figure 28: SEM micrograph of the micropump ...
Specifically, micropump and microvalve components for such a system will be ... The micropump and microvalve devices will be engineered for integration with ...
the impact of this factor and that of the suction-purriping micropump ..... attaching a micropump capable of operating in both positive and negative (air in ...
... 15 1.4 The passive valve micropump . . . . . ... 21 1.4.3 Conclusions from the micropump development . . . . . ...
Micropump Technology and Applications. Frank T. Hartley. Jet Propulsion Laboratory, California Institute of Technology. 4800 Oak Grove Drive, Pasadena CA 9 ...
Jan 22, 2011 ... Title: Micropump Technology and Applications. Authors: Hartley, F. Issue Date: 29-Oct-1999. Citation: Design, Characterization and Packaging ...
The proposed micropump-feed Direct Methanol Fuel Cell (DMFC) will provide a commercial product for use on multiple NASA manned missions, micro satellites, ...
... The �Actuator�: Integrated Gas Micropump � Concluding Remarks, Future Trends Page 4. ... 22 � Goal: Develop a miniature micropump for the µGC: ...
micropump; it provides many advantages over passive thermal control concepts ... microchannel configurations, working uids, and micropump technologies. ...
... a 2r Page 22. 2mm Micropump One Dime 3D Valveless Micropump � Truly 3D cavity structure to optimize the design � High ...
�m) was not demonstrated as a good pumping element in microfluidic systems. A valveless micropump was observed with the developed micropump in spite a bulky and external actuation device was required
... Fuel ejection & droplet formation � Micropump operation (especially, the valving) ... L Performance Modeling � TDA's Quasi 1-D Micropump Model ...
Also, the micro-pump itself might function as a valve. 3. COMPONENTS. FOR FLUID. HANDLING ... micropump, and a microvalve specially designed for integration ...
lasers, miniature gas chromatographs and high- frequency fluidic control systems. Micropumps are used involve fluid flows, but the present review will focus on the ones that do. Microducts, micropumps
... 1.1. Electrostatically actuated micropump with check valves.....3 ... Fig. 1.1 Electrostatically actuated micropump with check valves. ...
... The use of piezoelectric stacks to actuate a micropump has previously been demonstrated by Shoji et al [3]. In this implementation, micropumps ...
Nov 24, 2008 ... A highly efficient, robust, long-life micropump will have applications in the next generation of small space craft thermal control systems. ...
Sep 16, 2008 ... A highly efficient, robust, long-life micropump will have applications in the next generation of small space craft thermal control systems. ...
... The dye circulation system consisted of a micropump, a mesh filter, a dye reservoir, ... For 1 Hz UV dye laser operation, the micropump, having 40 ...
... Scheme 2 was developed to test a micropump using the bearing mechanism (27). The micropump device was also used ...
In this paper, a series of numerical simulations was performed to investigate the pumping performance of electro-osmotic micropumps containing electrode arrays patterned on the upper and lower sides of a microchannel. The simulations have been analyzed with a linear electro-osmotic model based upon the Debye-H�ckel theory of the double layer. The potential drop across the ...
A novel microstirring strategy is applied to accelerate the digestion rate of the substrate N?-benzoyl-L-arginine-4-nitroanilide (L-BAPA) catalyzed by sol-gel encapsulated trypsin. We use an ac nonlinear electrokinetic vortex flow to stir the solution in a microfluidic reaction chamber to reduce the diffusion length between the ...
