Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster II
DY 29.14: Poster
Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C
Wetting on Geometrically Structured Surfaces — •Monica Marinescu1,2, Mykola Tasinkevych1,2, and Siegfried Dietrich1,2 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — 2Universität Stuttgart, Institut für Theoretische und Angewandte Physik, Pfaffenwaldring 57, 70569 Stuttgart
Complete wetting on different geometrically structured substrates of a fluid close to its liquid-gas coexistence is studied. The system is described by an effective interface Hamiltonian which takes into account the long-range character of the substrate potential. Four structured geometries consisting of periodic arrays of rectangular and cylindrical pits and posts are considered. As a limiting case, wetting on a substrate with two rectangular, perpendicular “grooves” is also studied.
We describe wetting behaviour by the interfacial height function l(Δ µ), where l is the height of the liquid/gas interface at the cavity midpoint and Δ µ the distance from bulk coexistence. Based on this function, we find a filling regime for all aforementioned geometries provided the system is driven close enough to bulk coexistence. In the postfilling regime, universal scaling behaviour and covariance of the interfacial height function are analyzed.