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MA: Fachverband Magnetismus

MA 18: Magnetic Particles and Clusters

MA 18.7: Vortrag

Montag, 16. März 2020, 18:15–18:30, HSZ 403

Multidimensional actuation of microparticles with unique magnetic and biological functionalizations — •Meike Reginka, Andreea Tomita, Rico Huhnstock, Dennis Holzinger, and Arno Ehresmann — Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

In this work we present a transportation concept for magnetic particles based on the stray field design of exchange-biased micromagnetic arrays. Besides the one-dimensional transport of particle rows, a two-dimensional motion of particles above checker-board patterned substrates and their three-dimensional movement through stripe patterned tubes were realized. Extending the variety of magnetic probes starting from superparamagnetic particles (SPPs), we furthermore investigated the applicability of the transportation mechanism for differently functionalized microparticles. SPPs with biochemically coupled proteins were transported, concluding that the proteins’ specific requirements towards the liquid influence but do not inhibit the directed motion. Besides, we magnetically designed particles with anisotropic properties: Janus particles (JPs) result from the deposition of a magnetic film on top of non-magnetic microspheres or lithographically structured particles of arbitrary shape. The JPs’ degrees of motion can be selectively addressed by magnetic fields offering control not only over their position but also over their orientation. Synchronized rotational dynamics of the JPs induced by rotating magnetic fields were revealed along with the directed transport in the above described magnetic stray field landscapes.