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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: POSTERS Micro- and Nanofluidics
CPP 22.20: Poster
Wednesday, February 27, 2008, 16:00–18:30, Poster A
Dynamics of nano-droplets on structured surfaces — •Ali Moosavi1,2, Markus Rauscher1,2, and Siegfried Dietrich1,2 — 1Max-Planck-Institut für Metallforschung, Stuttgart, Germany — 2ITAP, Universität Stuttgart, Germany
Nanodroplets residing near topographical or chemical steps on solid substrates exhibit a disjoining pressure induced dynamics. Our nanoscale hydrodynamic calculations reveal that non-volatile droplets are attracted or repelled from steps depending mainly on the long-ranged component of the intermolecular interactions. Since the equilibrium contact angle depends on the balance between both long- and short-ranged interactions, in some cases droplets are attracted by the less wettable part of the substrate. This can also lead to energetic barriers for droplets crossing chemical steps from the less wettable side to the more wettable side.