Regensburg 2004 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 16: POSTER: Computational Physics, Complex Systems
CPP 16.13: Poster
Tuesday, March 9, 2004, 17:00–19:00, B
Foamy Emulsions confined in Channels: Digital Microfluidics — •Gangyao Wen1,2, Stephan Herminghaus1,2, and Ralf Seemann1,2 — 1Abteilung Angewandte Physik, Universitaet Ulm — 2MPI fuer Stroemungsforschung, Goettingen
Microfluidics is usually concerned with single phase liquids transported along solid microchannels. In the present project, we demonstrate possibilities of using instead a compartmented liquid consisting of an emulsion of water in oil, where the oily phase has a very small volume fraction. This is geometrically quite analogous to a foam, which exhibits a variety of transitions in its topology upon interaction with an externally provided (temporally variable) geometric constraint. The main issue here is the interplay of the internal length scale of the fluid, i.e., the size of the droplets, with the lateral dimension of the channels. We exploit the (potentially well controlled) manipulation of the emulsion droplets by the channel geometry in order to position, sort, exchange, compile and redistribute liquid compartments with different chemical contents.