Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Poster: Wetting, Micro and nanofluidics
CPP 21.3: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Wetting of grooved elastic substrates — •Carsten Herrmann1, Dominik Michler2, Martin Brinkmann2, and Ralf Seemann1,2 — 1Experimental Physics, Saarland University, D-66041 Saarbrücken — 2MPI for Dynamics and Self-Organization, D-37073 Göttingen
Wetting morphologies on grooved elastic substrates are considered experimentally. The substrates are fabricated from polydimethylsiloxane (PDMS) rubber and consist of straight parallel grooves having a rectangular shaped cross section. The wetting morphologies are generated by gas phase deposition and observed in-situ by optical microscopy. We explore the lateral order of the emerging wetting morphologies caused by the virtue of capillary forces and the shape of the liquid morphologies as function of wettability and geometry. Depending on geometry and wettability of the substrate an attractive or repulsive force between neighboring grooves respectively neighboring ridges emerge. This leads to different wetting scenarios and a particular lateral ordering of the wetting morphologies. We try to understand the mechanism causing the lateral ordering which are either a result of an energetic minimum or due to a frustration process.