Induced-charge Electrokinetic Phenomena: Theory and Microfluidic Applications

Details Induced-charge Electrokinetic Phenomena: Theory and Microfluidic Applications Induced-charge Electrokinetic Phenomena: Theory and Microfluidic Applications

2003-06-13

arxiv.org/abs/physics/0306100v2

Physics

Fluid Dynamics

4 pages, 4 figs; revsion with more refs, one new fig, and more emphasis on microfluidics

Scientific paper

10.1103/PhysRevLett.92.066101

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 micro-electrode arrays to various dielectric and conducting structures in weak DC or AC electric fields. The basic effect produces micro-vortices to enhance mixing in microfluidic devices, while various broken symmetries -- controlled potential, irregular shape, non-uniform 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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