Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster: Micro- and Nanofluidics
CPP 35.9: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Wetting of grooved elastic substrates — •Carsten Herrmann1, Dominik Michler2, Martin Brinkmann2, and Ralf Seemann1,2 — 1Saarland University, Saarbrücken, Germany — 2MPI DS, Göttingen, Germany
The wetting morphologies on grooved elastic substrates are considered experimentally and theoretically. The substrates are fabricated from Polydimethylsiloxane (PDMS) rubber and consist of straight parallel grooves having a rectangular shaped cross section. When liquid is deposited from the vapor phase into the grooves, the geometry of the grooves might be changed by the virtue of the capillary forces of the emerging liquid wetting morphologies. Depending on geometry and wettability of the substrate, either an attractive or repulsive force between the confining ridges of a groove results. This force leads to locally different groove geometries which are more or less attractive for the adsorbing liquid and thus a lateral ordering of the wetting morphologies occurs. We explore the lateral order and its development with time as well as the shape of the emerging liquid morphologies as function of wettability and groove geometry, i.e. the aspect ratio of both the grooves and the ridges. These experimental results are compared to results from analytical and numerical calculations minimizing the interface free energy and the bending energy of the ridges.