Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Micro and Nanofluidics
CPP 30.4: Poster
Mittwoch, 24. März 2010, 17:30–19:00, Poster C
Wetting of grooved elastic substrates — •Carsten Herrmann1, Dominik Michler1, Konstantina Kostourou2, Stefan Bommer1, and Ralf Seemann1 — 1Experimental Physics, Saarland University, D-66041 Saarbrücken — 2MPI for Dynamics and Self-Organisation, Bunsenstraße 10, D-37073 Göttingen
The wetting morphologies on grooved viscoelastic substrates are considered experimentally. Due to their elastic properties, the geometry of rubber substrates is changed in the presence of wetting morphologies by the virtue of the capillary forces. 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 lateral ordering of the wetting morphologies. 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 and the shape of the emerging liquid morphologies as function of wettability and geometry.