Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Micro and Nano Fluidics III: Lab-on-Chip Geometries
CPP 25.2: Vortrag
Donnerstag, 29. März 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 Bechinger1 — 12. 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)