Induced-charge electrokinetic phenomena
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Author(s)
Bazant, Martin Z.
Squires, Todd M.
Date Issued
February 2004
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Bazant, Martin Z. and Todd M. Squires. "Induced-Charge Electrokinetic Phenomena: Theory and Microfluidic Applications." Physical Review Letters 92, 066101 (2004) [4 pages].
Version
Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.92.066101
