Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 14: Microswimmers I (joint session DY/BP)
DY 14.4: Vortrag
Dienstag, 21. März 2017, 10:30–10:45, HÜL 186
Lattice Boltzmann study of magnetocapillary microswimmers — •Alexander Sukhov1, Qingguang Xie2, and Jens Harting1,2 — 1Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Fürther Straße 248, 90429 Nürnberg, Germany — 2Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, NL-5600MB Eindhoven, The Netherlands
Magnetocapillary swimmers - a system of three or more paramagnetic beads trapped at a fluid-gas interface - attracted recently considerable theoretical [1] and experimental attention [2]. Due to an interplay of attractive capillary and repulsive magnetic dipole-dipole interactions the swimmer can be stabilized. By applying a set of a static and a time-dependent magnetic field its position and the velocity direction can also be well manipulated. The last makes the swimmers potentially interesting for multiple applications ranging from a controlled cleaning of liquid interfaces to even a drug delivery or other medical applications in vivo.
Using a hybrid lattice Boltzmann and discrete element method we show a sharp dependence of the average speed of the swimmer on the frequency of the time-dependent magnetic field, demonstrate the control of the direction of the swimmer motion using B-fields and also analyze the obtained results analytically. [1] R. Chinomona, J. Lajeunesse, W.H. Mitchell, Y. Yao and S.E. Spagnolie, Soft Matter 11, 1828 (2015). [2] G. Grosjean, G. Lagubeau, A. Darras, M. Hubert, G. Lumay and N. Vanderwalle, Sci. Rep. 5, 16035 (2015).