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Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Micro and Nano Fluidics III: Lab-on-Chip Geometries

CPP 25.2: Talk

Thursday, March 29, 2007, 17:45–18:00, H37

Field mediated self assembly and actuation of highly parallel microfluidic devices — •Stefan Bleil1, Tobias Sawetzki1, David Marr2, and Clemens Bechinger112. Physikalisches Institut, Universität Stuttgart, Germany — 2Colorado School of Mines, USA

The use of microfluidic devices requires active components (pumps, valves and mixers) which can direct and control liquids in such structures. We present a novel approach where pumps and valves are created by a self assembly process which allows the realization of thousands of pumps at the same time. This is achieved by subjecting super paramagnetic colloidal particles to a rotating magnetic field, which results in a rotation of particles and thus leads to a fluid flow. The rotating field induces attractive interactions between particles and thus leads to the self assembly process. To control single pumps and valves individually we use optical tweezers, which can stop or slow down the motion of particle clusters. In addition to the advantage of forming large arrays of individually addressable devices, our approach allows also to scale the devices down to the nanometer range by using smaller particles.

S. Bleil, D.W.M. Marr and C. Bechinger; Appl. Phys. Lett., 88, 263515 (2006)

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