Rough ideas on wetting

After a brief presentation of the classical laws of wetting, we review different phenomenological descriptions of rough wetting, i.e., show how these classical laws must be modified on rough solids. This introduces the questions of hemi-wicking (can a film propagate inside the texture of a solid ?), rough films (is it possible for a liquid film to follow the roughness of a solid ?) and super-hydrophobicity (how can a solid be designed to become water repellent ?).