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Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Posters II

DY 29.33: Poster

Donnerstag, 29. März 2012, 17:00–19:00, Poster A

Bidisperse ferrofluid microstructure in a monolayer — •Elena Minina1,3, Alla Muratova1, Joan Cerda2, Sofia Kantorovich1,3, and Christian Holm31Ural Federal University, Lenin av. 51, Ekaterinburg, 620000, Russia — 2Institute for Cross-Disciplinary Physics and Complex System, Campus Universitat de les Illes Balears, 07122, Palma de Mallorca — 3Institut fuer Computerphysik, Universitaet Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Deutschland

A bidisperse ferrofluid possesses a complex and versatile microstructure even in the absence of an external magnetic field. This system can be regarded as a model for a real polydisperse dipolar fluid. It is worth saying that the microstructure strongly depends not only on the polydispersity, but also on the sample geometry. It is well known that in three dimensions space there are three main chain classes [C. Holm at al, J. Phys.: Cond. Mat. 18 (2006)], but in the case of a constraint geometry (quasy-2D) it is necessary to consider 19 classes of chains, rings and single particles for the description of the microstructure in terms of a classical density functional theory that compared well to results obtained via by molecular dynamics simulations. The calculation of the virial coefficients allows us to demonstrate the influence of the geometry on the interparticle interaction and, as a result, on the cluster formation. In our contribution we compare the probabilities for chain formation of different length and particle composition in the 3D and quasy-2D geometries and also confirm the distinction of the microstructures in the geometries by using virial coefficients.

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