Is there an Optimal Substrate Geometry for Wetting ?

Details Is there an Optimal Substrate Geometry for Wetting ? Is there an Optimal Substrate Geometry for Wetting ?

1999-05-14

arxiv.org/abs/cond-mat/9905213v1

Physics

Condensed Matter

30 pages, 5 figures, postscript

Scientific paper

We consider the problem of the Winterbottom's construction and Young's equation in the presence of a rough substate and establish their microscopic validity within a 1+1-dimensional SOS type model. We then present the low temperature expansion of the wall tension leading to the Wenzel's law for the wall tension and its corrections. Finally, for a fix roughness, we compare the influence of different geometries of the substrate on wetting properties. We show that there is an optimal geometry with a given roughness for a certain class of simple substrates. Our results are in agreement and explain recent numerical simulations.

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