Drops onto gradients of texture

Hydrophobic microtextures on solids provide water repellency: drops hardly stick on these materials and bounce off after impacts. Here we achieved solids decorated with a texture of variable density. Impacting water drops were observed to bounce off obliquely, demonstrating a transfer of vertical mo...

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Bibliographic Details
Published in:Europhysics letters 2009-08, Vol.87 (3), p.36003-36003p5
Main Authors: Reyssat, M, Pardo, F, Quéré, D
Format: Article
Language:English
Subjects:
68.03.Cd
68.08.Bc
85.40.Hp
Fluid mechanics
Mechanics
Physics
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Summary:Hydrophobic microtextures on solids provide water repellency: drops hardly stick on these materials and bounce off after impacts. Here we achieved solids decorated with a texture of variable density. Impacting water drops were observed to bounce off obliquely, demonstrating a transfer of vertical momentum in the horizontal direction, after rebound. This allows us to understand why vibrated drops move on such surface: an asymmetric dewetting takes place for each cycle of the vibration, which leads to an incremental drift of the liquid towards regions of high texture density.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/87/36003