Microscopic structure of electrowetting-driven transitions on superhydrophobic surfaces

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We investigate directly at the microscale the morphology of the electrowetting induced transition between the Cassie-Baxter and Wenzel states for a water droplet on a superhydrophobic surface. Our experiments demonstrate that the transition originates in a very narrow annular region near the macroscopic contact line, which is first invaded by water and causes a thin film of air to be entrapped below. At high applied voltages, a growing fraction of microscopic air-pockets collapse, resulting in a partialWenzel state. Modulations in the intensity of the light reflected from individual micro-menisci clarify that the local contact angles near the filling transition are close to the usual advancing values for contact lines on smooth surfaces.
9 pages, 5 figures

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Fluid Dynamics

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http://salesiana.dossiersoluciones.com/handle/123456789/146149

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0801.2683
 http://arxiv.org/abs/0801.2683

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arXiv