Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Micro and Nano Fluidics III: Migration and flow
CPP 28.2: Vortrag
Donnerstag, 28. Februar 2008, 17:00–17:15, C 264
Colloidal Particles Operating Microfluidic Devices — •Tobias Sawetzki1, Sabri Rahmouni1, Stefan Bleil1, David W.M. Marr2, and Clemens Bechinger1 — 12. Physikalisches Institut, Universität Stuttgart — 2Chemical Engineering Department, Colorado School of Mines
The miniaturization of microfluidic devices has raised the interest of researchers in biology, chemistry, engineering and physics. Nevertheless, the future goal of a fully functional small and mobile device, the ‘lab on the chip‘, has proven to be quite difficult to reach. In our approach we use paramagnetic colloidal particles as in situ building blocks for different functionalities such as pumping or mixing of liquids in channel structures on the micron scale. Once arranged by optical tweezers, the colloidal particles are driven by an external magnetic field which rotates in the sample plane and thus exerts a torque on the colloidal clusters. We demonstrate how this approach allows us to create pumps, valves, T-junctions and mixers. In contrast to other approaches, our concept is quite insensitive to the character of the liquid and the channel material and can be easily scaled up or down thus making it a versatile approach for creating microfluidic devices.