Wetting on Random Roughness: the Ubiquity of Wenzel Prewetting

Details Wetting on Random Roughness: the Ubiquity of Wenzel Prewetting Wetting on Random Roughness: the Ubiquity of Wenzel Prewetting

2012-03-23

arxiv.org/abs/1203.5215v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

The wetting properties of solid substrates with macroscopic random roughness are considered as a function of the microscopic contact angle of the wetting liquid and its partial pressure in the surrounding gas phase. It is shown that Wenzel prewetting, which has been recently predicted for a rather wide class of roughness pro?les derived from Gaussian random processes by a general distortion procedure, should in fact be ubiquitous and prevail under even much milder conditions. The well-known transition occurring at Wenzel's angle is accompanied by a prewetting transition, at which a jump in the adsorbed liquid volume occurs. This should be present on most surfaces bearing homogeneous, isotropic random roughness.

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