Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: POSTERS Micro- and Nanofluidics
CPP 22.3: Poster
Wednesday, February 27, 2008, 16:00–18:30, Poster A
Mixing on the micron-scale with rotating colloidal clusters — •Sabri Rahmouni1, Tobias Sawetzki1, David Marr2, and Clemens Bechinger1 — 12. Physikalisches Institut, Universität Stuttgart — 2Chemical Engineering Department, Colorado School of Mines
Recently, the fabrication of "lab on a chip" devices has attracted considerable attention amongst physicists and chemists. In the meantime many different approaches and solutions to operate such devices have been suggested. One of the main problems is the mixing of fluid components on the micron scale, i.e. at low Reynolds numbers where no turbulence exists. We demonstrate a novel approach to overcome this problem by subjecting paramagnetic colloidal particles to magnetic fields which rotate in the sample plane. As a result, an external torque is exerted on the colloidal particles which then act as micro mixers. When analyzing the output flow of a mixing chamber, we observe that such mixers strongly enhance the mixing of the two inlets, one of them containing small, nonmagnetic tracer particles.