Regensburg 2016 – scientific programme

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.13: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

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 — Department of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

Designing an analysis platform for microfluidic devices based on the directed transport of particles requires an estimate of the particle’s behaviour in the presence of transversal liquid flow. The controllable movement of superparamagnetic particle rows above magnetically stripe-patterned exchange bias (EB) layer systems can be used to efficiently transport analyte molecules attached to the particle in a microfluidic structure.^[1] The head-to-head and tail-to-tail orientation of the magnetization in adjacent stripe domains vertical to the long stripe axis is introduced to the EB sample by ion bombardment induced magnetic patterning (IBMP). Particle velocities perpendicular to the direction of their simultaneous transport caused by transversal fluid flows of defined rates have been experimentally determined. It has been shown that their velocities along the flow direction are 2 to 3 magnitudes smaller than the mean fluid velocity since the particles are transported close to the sample surface. The trajectory of a particle remains almost unaffected and allows for the purification of biomolecules in microfluidic devices with transversal flow components.

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