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Induced-Charge Electrokinetic Phenomena: Theory and Microfluidic Applications

Bazant, Martin Z. and Squires, Todd M. (2004) Induced-Charge Electrokinetic Phenomena: Theory and Microfluidic Applications. Physical Review Letters, 92 (6). Art. no. 066101. ISSN 0031-9007. doi:10.1103/PhysRevLett.92.066101.

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We give a general, physical description of "induced-charge electro-osmosis" (ICEO), the nonlinear electrokinetic slip at a polarizable surface, in the context of some new techniques for microfluidic pumping and mixing. ICEO generalizes "ac electro-osmosis" at microelectrode arrays to various dielectric and conducting structures in weak dc or ac electric fields. The basic effect produces microvortices to enhance mixing in microfluidic devices, while various broken symmetries—controlled potential, irregular shape, nonuniform surface properties, and field gradients—can be exploited to produce streaming flows. Although we emphasize the qualitative picture of ICEO, we also briefly describe the mathematical theory (for thin double layers and weak fields) and apply it to a metal cylinder with a dielectric coating in a suddenly applied dc field.

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Additional Information:©2004 The American Physical Society (Received 17 June 2003; published 10 February 2004) This research was supported in part by the U.S. Army through the Institute for Soldier Nanotechnologies, under Contract No. DAAD-19-02-0002 with the U.S. Army Research Office.
Subject Keywords:electrokinetic effects; electrophoresis; osmosis; slip flow; microfluidics; microelectrodes; vortices; mixing; electrohydrodynamics
Issue or Number:6
Record Number:CaltechAUTHORS:BAZprl04
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1318
Deposited By: Archive Administrator
Deposited On:10 Jan 2006
Last Modified:08 Nov 2021 19:09

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