Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 35: Magnetic Particles / Clusters

MA 35.11: Talk

Wednesday, March 22, 2017, 12:00–12:15, HSZ 101

Transport of superparamagnetic particles on magnetically structured exchange bias layer systems in microfluidic devices with transversal flow — •Meike Reginka, Dennis Holzinger, Iris Koch, and Arno Ehresmann — Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

The controllable movement of superparamagnetic particles above magnetically stripe-patterned exchange bias (EB) layer systems was used to transport such particles in a microfluidic structure.^[1] Transversal flows of defined flux were used to affect the particles’ movement perpendicular to the direction of their simultaneous transport. The particle velocities along the flow direction were shown to be 2 to 3 orders of magnitude smaller than the mean fluid velocity due to the transport being located close to the sample surface. The particlestrajectories remain almost unaffected, which allows the purification of biomolecules in microfluidic devices with transversal flow components. Besides that, the effect of the ferromagnetic layer thickness of the EB system was studied for further tailoring of the transport characteristics of superparamagnetic particles by a change of the intrinsic properties of the substrate material.

[1] D. Holzinger, I. Koch, S. Burgard, and A. Ehresmann, ACS Nano 9, 7323 (2015)