Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Brownian motion and transport II

DY 22.3: Vortrag

Donnerstag, 26. März 2009, 10:45–11:00, ZEU 118

Magnetic Ratchet for transportation and separation of magnetic beads — •Alexander Auge, Alexander Weddemann, Frank Wittbracht, and Andreas Hütten — Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany

Transport phenomena in spatially periodic magnetic systems far from thermal equilibrium are considered. The emphasis is put on directed transport of magnetic beads in a so called magnetic ratchet (Brownian motor). An asymmetric magnetic potential and Brownian motion of magnetic beads are the basic concepts for a magnetic ratchet. The asymmetric magnetic potential is achieved by combining an external magnetic field with a spatial periodic array of conducting lines. In this work simulations are carried out to test and optimize this asymmetric potential. As simulation model the Smoluchowski equation with additional flux terms for the magnetic and gravitational force is used. Furthermore experiments are carried out to verify the simulation results. Possible applications like transport in microfluidic devices and separation of magnetic beads are discussed.