Dresden 2020 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 16: Poster IV
BP 16.1: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/EG
Nanobars as a tunable stirrer for cell-like systems — •Mithun Thampi, Pierre-Yves Gires, and Matthias Weiss — Experimental Physics I, University of Bayreuth, Germany
Transport inside living systems or biofluid droplets is governed by diffusion and energy-dependent active transport. Speeding up these processes remains challenging: here we report on an easy way to gently stir biofluid droplets. We produce micrometer long magnetic stir bars (NBs) by aligning Fe3O4 nanoparticles and stabilizing them by a biocompatible silica coating. The successful production of these NBs is confirmed by scanning electron microscopy. The rotating magnetic field is achieved by using two pairs of Helmholtz-like coils with a custom build controller, which can tune both the frequency and the strength of the magnetic field. As the rotation frequency is increased, we observed the generation of superdiffusive transport in a NBs suspension of 200 nm fluorescent beads up to an optimum frequency. The range of frequencies we looked at is from 0.01 to 10 Hz and the magnetic field is around 10 mT. The frequency dependence of the transport property can be connected to the dynamics at the single NB level, which is also characterized in parallel experiments. We finally look at their stirring effects on the out of equilibrium self-organization of Xenopus laevis egg extract.