Dresden 2009 – wissenschaftliches Programm
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SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 7: Self-Organizing Surfaces and Interfaces VI
SYSO 7.2: Vortrag
Donnerstag, 26. März 2009, 16:00–16:15, GÖR 226
Depinning of three-dimensional drops from wettability defects — •Philippe Beltrame1, Peter Hänggi1, and Uwe Thiele2 — 1Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany — 2Department of Mathematical Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
Substrate defects crucially influence the onset of sliding drop motion under lateral driving. A finite force is necessary to overcome the pinning influence even of microscale heterogeneities [1]. The depinning dynamics of three-dimensional drops is studied for hydrophilic and hydrophobic wettability defects using a long-wave evolution equation for the film thickness profile. It is found that the nature of the depinning transition explains the experimentally observed stick-slip motion [2].
[1] Thiele and Knobloch, New J. of Phys. 8 (2006) 313
[2] Beltrame, Hänggi and Thiele, submitted to EPL, (2008), arXiv:0811.2918v1