Bouncing transitions on microtextured materialsM. Reyssat1, A. Pépin2, F. Marty3, Y. Chen2, 4 and D. Quéré1
1 Laboratoire de Physique de la Matière Condensée, FRE 2844 du CNRS Collège de France - 75231 Paris Cedex 05, France
2 Laboratoire de Photonique et Nanostructures (LPN) - Route de Nozay 91460 Marcoussis, France
3 Groupe ESIEE, SMM, Cité Descartes - BP 99, 93162 Noisy le Grand, France
4 Ecole Normale Supérieure - 24 rue Lhomond, 75231 Paris Cedex 05, France
received 18 November 2005; accepted in final form 14 February 2006
published online 22 March 2006
A drop of water thrown on a super-hydrophobic solid will often bounce off. Here we discuss the conditions to be fulfilled on the surface design (which provides super-hydrophobicity) to observe such a behavior. This allows us to precise how a material can be made water-repellent. We show in particular how the reduction of the scale of the microstructure provides a robust water repellency, and describe some peculiarities of violent shocks on such surfaces.
68.08.Bc - Wetting.
68.03.-g - Gas-liquid and vacuum-liquid interfaces.
68.08.-p - Liquid-solid interfaces.
© EDP Sciences 2006