Laboratoire de Physique de la Matière Condensée, URA 792 du CNRS
Collège de France - 75231 Paris Cedex 05, France
Accepted: 9 May 2001
If a rough surface is put in contact with a wetting liquid, the roughness may be spontaneously invaded depending on the surface pattern and the wetting properties of the liquid. Here, we study the conditions for observing such an imbibition and present practical achievements where the wetting properties of the surface can be predicted and tuned by the design of a solid texture. The contact angle of a drop on such a surface (where solid and liquid coexist) is discussed. Finally, the dynamics of the liquid film is found to obey a diffusive-type law, as in the case of porous wicking.
PACS: 68.03.-g – Gas-liquid and vacuum-liquid interfaces / 68.35.Ct – Interface structure and roughness / 68.08.Bc – Wetting
© EDP Sciences, 2001