Volume 87, Number 3, August 2009
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||27 August 2009|
Drops onto gradients of texture
Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, ESPCI - 10 rue Vauquelin, 75005 Paris, France, EU
2 Laboratoire de Photonique et Nanostructures, UPR 20 du CNRS - Route de Nozay, 91460 Marcoussis, France, EU
Corresponding author: email@example.com
Accepted: 20 July 2009
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.
PACS: 68.08.Bc – Wetting / 68.03.Cd – Surface tension and related phenomena / 85.40.Hp – Lithography, masks and pattern transfer
© EPLA, 2009
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