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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation
CPP 22.33: Poster
Mittwoch, 24. März 2021, 16:30–18:30, CPPp
Directing the Diffusion of a Nonmagnetic Nanosized Active Particle with External Magnetic Fields — •Martin Kaiser1 and Sofia Kantorovich1,2 — 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria — 2Ural Federal University, Lenin Av. 51, Ekaterinburg 620000, Russian Federation
With the help of molecular dynamics simulations we show that an arbitrary non-magnetic active particle with a size below one micrometer, being immersed in a polydisperse system of magnetic nanoparticles, can diffuse twice faster along the direction of the applied field than perpendicular to the latter, whereas, for a monodisperse system, the ratio between diffusion coefficients parallel and perpendicular to the field approaches two orders of magnitude, even for magnetic fields of moderate strength. The ability to direct a non-magnetic active particle along the magnetic field stems from the formation of chains of magnetic nanoparticles aligned with the field direction. Such chains form effective channels through which the active particle can diffuse. We find that the ability to direct an active particle of a given size can be maximised by changing magnetic particle concentration so that the tunnels formed by the change have a mean width of approximately the active particle size.