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Electrically Controlled Wetting and Dewetting Transition on Silicon Micro-Pillar Arrays

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We investigate here electrically-controlled wetting and dewetting on rough surfaces comprised of silicon micro-pillars coated with a hydrophobic material. Electro-wetting experiments indicate that water droplets wet the micro-array when the applied voltage is raised beyond a threshold value. When the applied bias is removed, the water droplets can be made to partially dewet the surface and revert back into a stable hydrophobic state by appropriate design of the porosity of the micro-array, the aspect ratio of the micro-pillars and the wetting property of the coating material. Such electrically-controlled wetting of hydrophobic (rough) surfaces can have significant impact in micro-fluidic and lab-on-chip applications.
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Document Type: Research Article

Publication date: December 1, 2008

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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