Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.19: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Liquid-liquid dewetting — •Stefan Bommer1, Sebastian Jachalski2, Dirk Peschka2, Ralf Seemann1 und Barbara Wagner2 — 1Saarland University — 2Weierstrass Institute 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 Newontian 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. Required experimental input parameters like the ratio of surface tensions of the liquid/air and the liquid/liquid interface and the contact angles which are extracted from the equilibrium shapes of the droplets. The transient droplet shapes are modeled by a lubrication approximation. A remarkably independence of the transient shapes on the start conditions was found theoretically for sufficiently 'mature' droplets which allows for a quantitative comparison with experimental droplet morphologies, whereas both theoretical results describe the experimental results quantitatively.