Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity
CPP 30.3: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
Liquid-liquid dewetting — •Stefan Bommer1, Sebastian Jachalski2, Dirk Peschka2, Ralf Seemann1, and Barbara Wagner2 — 1Saarland University, 66041 Saarbrücken — 2Weierstraß-Institute, 10117 Berlin
The transient morphologies towards equilibrium of liquid droplets dewetting on another liquid are considered experimentally and theoretically. As liquids short chained polystyrene and polymethylmethacrylate are used which are glassy at room temperature and which can be considered as Newtonian liquids well above their glass transition temperatures. The liquid/air interfaces are imaged in situ by scanning force microscopy whereas the liquid/liquid interface is imaged after solidifying the sample and removing the dewetting polystyrene. The obtained droplet shapes are compared to numerical results in lubrication approximation which are calculated for the surface tensions and contact angles which are extracted from the equilibrium shapes of the droplets. A remarkably independence of the transient shapes on the start conditions was found for sufficiently 'mature' droplets which allows for the quantitative comparison.