Volume 74, Number 2, April 2006
|Page(s)||299 - 305|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||15 March 2006|
Bouncing or sticky droplets: Impalement transitions on superhydrophobic micropatterned surfaces
Laboratoire de Physique Statistique de l'ENS, CNRS, UMR 8550 associée aux Universités Paris 6 et Paris 7 - 24 rue Lhomond, 75231 Paris Cédex 05, France
2 Laboratoire de Physico-Chimie Curie, Institut Curie, CNRS, UMR 168 26 rue d'Ulm, 75248 Paris Cédex, France
Accepted: 14 February 2006
When a liquid drop impinges a hydrophobic rough surface it can either bounce off the surface (fakir droplets) or be impaled and strongly stuck on it (Wenzel droplets). The analysis of drop impact and quasi-static “loading” experiments on model microfabricated surfaces allows to clearly identify the forces hindering the impalement transitions. A simple semi-quantitative model is proposed to account for the observed relation between the surface topography and the robustness of fakir non-wetting states. Motivated by potential applications in microfluidics and in the fabrication of self-cleaning surfaces, we finally propose some guidelines to design robust superhydrophobic surfaces.
PACS: 68.08.Bc – Wetting / 68.03.Cd – Surface tension and related phenomena / 47.55.D- – Drops and bubbles
© EDP Sciences, 2006
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