dorsal/arxiv
View SchemaInduced-charge Electrokinetic Phenomena: Theory and Microfluidic Applications
| Authors | Martin Z. Bazant, Todd M. Squires |
|---|---|
| Categories | |
| ArXiv ID | physics/0306100 |
| URL | https://arxiv.org/abs/physics/0306100 |
| DOI | 10.1103/PhysRevLett.92.066101 |
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 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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"abstract": "We give a general, physical description of ``induced-charge electro-osmosis\u0027\u0027\n(ICEO), the nonlinear electrokinetic slip at a polarizable surface, in the\ncontext of some new techniques for microfluidic pumping and mixing. ICEO\ngeneralizes ``AC electro-osmosis\u0027\u0027 at micro-electrode arrays to various\ndielectric and conducting structures in weak DC or AC electric fields. The\nbasic effect produces micro-vortices to enhance mixing in microfluidic devices,\nwhile various broken symmetries -- controlled potential, irregular shape,\nnon-uniform surface properties, and field gradients -- can be exploited to\nproduce streaming flows. Although we emphasize the qualitative picture of ICEO,\nwe also briefly describe the mathematical theory (for thin double layers and\nweak fields) and apply it to a metal cylinder with a dielectric coating in a\nsuddenly applied DC field.",
"arxiv_id": "physics/0306100",
"authors": [
"Martin Z. Bazant",
"Todd M. Squires"
],
"categories": [
"physics.flu-dyn",
"physics.chem-ph"
],
"doi": "10.1103/PhysRevLett.92.066101",
"title": "Induced-charge Electrokinetic Phenomena: Theory and Microfluidic Applications",
"url": "https://arxiv.org/abs/physics/0306100"
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