Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 80: Brownian Motion and Transport
DY 80.1: Vortrag
Freitag, 16. März 2018, 10:00–10:15, BH-N 128
Analyzing Transport Properties of Nanoparticles in Magnetic Ratchets — •Daniel Kappe1,2 and Andreas Hütten1 — 1Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany — 2Bielefeld Institute for Applied Materials Research, Bielefeld University of Applied Sciences, Germany
Magnetic nanoparticles have a broad range of possible applications, ranging from cancer treatment to drug delivery and diagnostics. When detecting biomolecules, nanoparticles are superior to micrometer sized particles, because their surface can only bind to a couple of molecules instead of a thousands. But directed, controlled transport is tricky, because of their high diffusivity. A magnetic ratchet utilizes this property and an asymmetric potential to drive the particles. We introduce a scheme to evaluate the transport efficiency of magnetic ratchets.
In order to calculate the efficiency of such setups, a Monte Carlo based numerical integration of the Langevin equation was implemented [1]. The algorithm considers viscous forces, Brownian motion and forces arising from magnetic field gradients, but no particle-particle interactions. Particles subject to a time and space dependent force field, governed by the setup in use. The efficiency of a setup is analyzed reviewing the mean displacement of all particles.
We aim to improve understanding of different setups and tune their parameters, like switching frequencies and external fields, to find and extend the range of particles working in a particular setup.
[1] D. Ermak, H. Buckholz, J. comp. Phys., 35, 169-182 (1980)