Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: POSTER: Micro and Nano Fluidics
CPP 19.10: Poster
Mittwoch, 28. März 2007, 16:00–18:30, Poster B
Dynamics of droplets on open microfluidic Y-junctions — •Fabian Dörfler1,2, Markus Rauscher1,2, and Siegfried Dietrich1,2 — 1Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — 2Institut für Theoretische und Angewandte Physik, Universität Stuttgart, 70569 Stuttgart
We investigate the dynamics of droplets on chemical channels with Y-junctions driven by body forces. Chemical channels are wetting stripes on otherwise non-wetting surfaces in which liquids can be guided.
We analyse the energy of a droplet in the vicinity of a junction in a capillary model in quasistationary approximation. We investigate the pinning of the droplets in the junction and from the local contact angle we determine thresholds for the spilling of droplets onto the non-wetting substrate.