Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 2: Magnetic Particles/Clusters I

MA 2.3: Talk

Monday, March 26, 2007, 10:45–11:00, H10

Simulation of magnetic beads in on-chip structures — •Alexander Weddemann, Simone Herth, Michael Schilling, Andreas Hütten und Günter Reiss — Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany

In this work the behaviour of particles with a permanent magnetic moment, so called magnetic beads, in a micro channel system under the influence of hydrodynamic and electrodynamic interactions is discussed. The particle density within the fluid is therefore assumed to be small enough to neglect particle dipole-dipole-interactions.

The geometry of the micro channels is chosen so as to avoid turbulence. In that case the force on the particles due to viscosity of the fluid is given by Stokes Drag Law. A micro channel system was constructed, to allow guiding nanoparticles with the help of two flow currents, if there is no magnetic gradient field applied. With the help of an additional inhomogeneous magnetic field, it is shown that such geometry can be used to separate magnetic particles in respect to their magnetic moment. Magnetic field design is being discussed and the resulting magnetic fields for several current geometries have been simulated. In addition further applications will be shown:

1) the possiblity to measure the viscosity of the carrier liquid

2) a way to separate biomolecules for certain properties e.g. size