Experiments on AC electrokinetic pumping of liquids using arrays of microelectrodes

García-Sánchez, Pablo; Ramos, António; Green, Nicolas G.; Morgan, Hywel

doi:10.1109/tdei.2006.1657983

Cited by 72 publications

(77 citation statements)

References 26 publications

(47 reference statements)

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“…When an AC field is induced over the asymmetric pairs, eddies form over the electrodes. 15,17,27,30,31 These eddies draw the fluid flow directionally from the small electrode towards the large electrode ( Figure 1(d)). …”

Section: Resultsmentioning

confidence: 99%

“…surface. 15,30,31 The spacing between electrodes as well as the electrode width is crucial to drive bulk unidirectional ACEO pumping and to induce positive and negative DEP. The size of these eddies above the electrodes is dependent on the AC field gradient and is, therefore, affected by the size of the electrode and the distance between them.…”

Section: Resultsmentioning

confidence: 99%

“…The size of these eddies above the electrodes is dependent on the AC field gradient and is, therefore, affected by the size of the electrode and the distance between them. 30,31 Previous ACEO pumping devices using asymmetric electrodes have identified 300 Hz, 800 mV as favorable parameters for inducing bulk ACEO flow. 17,18 Thus, the ACEO fluid flows and their efficiency for particle collection for three electrode pattern designs were first evaluated at 300 Hz, 800 mV (Table I).…”

Section: Resultsmentioning

confidence: 99%

“…[7][8][9][10][11]25 The results are consistent with ACEO pumping models predicting that the optimal pumping widths are 1.5Â, 6.55Â, and 4.74Â for the small electrode, large electrode, and large gap, respectively, 34 so configuration 1, with feature dimensions of 1Â, 6Â, and 3Â, is most effective in generating strong unidirectional fluid velocity. 17,19,23,31,34,35 …”

Section: Resultsmentioning

confidence: 99%

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On-chip collection of particles and cells by AC electroosmotic pumping and dielectrophoresis using asymmetric microelectrodes

Melvin¹,

Moore²,

Gilchrist³

et al. 2011

Biomicrofluidics

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The recent development of microfluidic "lab on a chip" devices requiring sample sizes <100 lL has given rise to the need to concentrate dilute samples and trap analytes, especially for surface-based detection techniques. We demonstrate a particle collection device capable of concentrating micron-sized particles in a predetermined area by combining AC electroosmosis (ACEO) and dielectrophoresis (DEP). The planar asymmetric electrode pattern uses ACEO pumping to induce equal, quadrilateral flow directed towards a stagnant region in the center of the device. A number of system parameters affecting particle collection efficiency were investigated including electrode and gap width, chamber height, applied potential and frequency, and number of repeating electrode pairs and electrode geometry. The robustness of the on-chip collection design was evaluated against varying electrolyte concentrations, particle types, and particle sizes. These devices are amenable to integration with a variety of detection techniques such as optical evanescent waveguide sensing.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

On-chip collection of particles and cells by AC electroosmotic pumping and dielectrophoresis using asymmetric microelectrodes

Melvin¹,

Moore²,

Gilchrist³

et al. 2011

Biomicrofluidics

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“…Discovery of AC-electrophoresis of Janus particles [13] and spinning of 3 Janus doublets [14] supports the idea that broken symmetry of the particle can lead to ICEO pumping and electrophoresis. Pumping has been also observed in a somewhat different context of asymmetric electrodes subject to AC voltage [15][16].…”

mentioning

confidence: 89%

Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries

et al. 2014

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We establish experimentally the flow patterns of induced-charge electro-osmosis (ICEO) around immobilized metallic spheres in aqueous electrolyte. The AC field modifies local electrolyte concentration and causes quadrupolar flows with inward velocities being smaller than the outward ones. At high fields, the flow becomes irregular, with vortices smaller than the size of the sphere. Janus metallo-dielectric spheres create dipolar flows and pump the fluid from the dielectric toward the metallic part. The experimentally determined far-field flows decay with the distance as r -3 .

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Tools for the Design of Miniaturized Analytical Systems

Ríos

Escarpa

Simonet

2009

Miniaturization of Analytical Systems

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Experiments on AC electrokinetic pumping of liquids using arrays of microelectrodes

Abstract: ABSTRACT

Cited by 72 publications

References 26 publications

On-chip collection of particles and cells by AC electroosmotic pumping and dielectrophoresis using asymmetric microelectrodes

On-chip collection of particles and cells by AC electroosmotic pumping and dielectrophoresis using asymmetric microelectrodes

Induced-charge electro-osmosis around metal and Janus spheres in water: Patterns of flow and breaking symmetries

Tools for the Design of Miniaturized Analytical Systems

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