Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Magnetic Particles / Clusters II

MA 16.4: Talk

Tuesday, March 27, 2012, 10:15–10:30, EB 202

Microfluid mixing due to domain wall movement assisted transport of superparamagnetic beads — •Dennis Holzinger, Daniel Lengemann, Dieter Engel, and Arno Ehresmann — Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

Domain wall movement assisted transport (DOWMAT) of superparamagnetic particles[1] using a magnetic parallel-stripe patterned exchange bias layer system with head-to-head and tail-to-tail orientation of the magnetization in adjacent domains is shown to be an outstanding tool for active mixing in a microfluidic device. The controlled stepwise movement of complete particle rows increases the interface between the two fluids. The particles acting as active micro-stirrers accelerate dramatically the mixing speed as compared to thermal diffusion. Moreover, the mixing speed is precisely controllable by modification of the particle rows movement sequences.

[1] Ehresmann, A., Lengemann, D., Weis, T., Albrecht, A., Langfahl-Klabes, J., Göllner, F. and Engel, D., Advanced Materials, doi: 10.1002/adma.201103264 (2011)