Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Magnetic Nanoparticles

MA 9.7: Vortrag

Montag, 31. März 2014, 16:45–17:00, HSZ 401

Transport of superparamagnetic particles on magnetically structured exchange bias bilayer systems for enhanced mixing in microfluidic devices — •Iris Koch, Dennis Holzinger, Daniel Lengemann, 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

The active mixing of two aqueous fluids in a microfluidic device obtained via controlled movement of superparamagnetic particle rows above micromagnetic stripe-patterned exchange bias bilayer systems with head-to-head and tail-to-tail orientation of the magnetization in adjacent domains parallel to the short stripe axis,[1] fabricated via ion bombardment induced magnetic patterning (IBMP), was experimentally optimized by investigating the mixing efficiency as a function of the mixing parameters, i.e. the concentration of magnetic particles, the movement scheme of the particles while mixing and both the frequency and pulse shape of the external magnetic field responsible for the particle transport. It is shown that the mixing efficiency is doubled as a result of the optimization procedure as compared to prior investigations. Hence, the active mixing due to the particle movement is five times faster compared to passive mixing via thermal diffusion.

[1] D. Holzinger, D. Lengemann, F. Göllner, D. Engel and A. Ehresmann, Appl. Phys. Lett. 100, 153504 (2012)