Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: POSTERS Magnetic Soft Matter

CPP 12.8: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Structure formation in ferrofluid monolayers: theory and computer simulations — •Christian Holm1,2,3, Juan Cerda1,2, and Sofia Kantorovich3,41Universität Stuttgart. Institut für Computerphysik, 70569 Stuttgart, Germany — 2FIAS,Goethe-University Frankfurt, Germany — 3MPI for Polymer Research, Mainz, Germany — 4Department of Mathematical Physics, Urals State University, Ekaterinburg, Russia

Ferrofluid particles are known to self-assemble into a variety of magnetic equilibrium structures which depend on several factors such as: system geometry, magnetic interactions, particle polidispersity, presence or absence of external fields, etc. The phase behaviour and microstructure of ferrofluid systems in reduced dimensions is not necessarilly equivalent to that of 3D systems. In order to investigate the peculiarities brought by the 2D geometry into the aggregation processes in ferrofluids, a combination of density functional theory, and molecular dynamics (MD) simulations is presented. Long-range dipolar interactions in our monolayer simulations are computed using a recently developed dipolar-P3M-layer correction algorithm. In comparison to the traditional Ewald sum methods, this approach allows to handle larger systems. The mircrostructure formation and the behaviour of monodisperse and bidisperse ferrofluid monolayers are studied thoroughly, and a comparison between numerical simulations and DFT is presented.

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