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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 36: Colloids and Complex Liquids II

CPP 36.10: Vortrag

Mittwoch, 2. April 2014, 17:30–17:45, ZEU 114

Gradient diffusion in ferrofluids with chain aggregates — •Alla Muratova¹, Alexey Ivanov¹, and Sofia Kantorovich^{1, 2} — ¹Ural Federal University, 620000, Russia, Ekaterinburg, Lenin. av., 51 — ²University of Vienna, Sensengasse 8, 1090, Wien, Austria

We present the results on the mobility and diffusion coefficients in the systems of magnetic dipolar particles. There were several attempts to study diffusion [Yu. A. Buyevich et al., Physica. A 190, 276 (1992); P. Ilg, Phys. Rev. E 71, 051407 (2005); J. Jordanovic et al., Phys. Rev. Lett. 106, 038301 (2011)], but the detailed theoretical description is still missing. We study how the mobility and diffusion coefficients depend on the system polydispersity, granulometric composition, geometrical constraints, and a presence of an external magnetic field. In order to know this, we consider three-dimensional and quasi-two-dimensional mono- and bidisperse systems with and without an external magnetic field. We use the obtained diffusion coefficients for calculating the distribution of chain aggregates in the gravity gradient. Also we consider different systems in dependence of different particle sizes. The main method of our theory is density functional theory. We compare our theoretical results, and explain dependence of the diffusion coefficients on some parameters. Also we compare our theoretical results to the data of the computer simulations.