Journal
EUROPHYSICS LETTERS
Volume 74, Issue 2, Pages 299-305Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2005-10522-3
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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.
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