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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster: Colloids and Complex Liquids

CPP 37.3: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster B2

Liquid-gas phase transition in a ferrofluid monolayer in an external field — •Heiko Schmidle and Sabine H.L. Klapp — Technische Universität Berlin, Institut für Theoretische Physik, Hardenbergstr. 36, 10623 Berlin

We present the results of a theoretical study of a ferrofluid monolayer in an external field. Magnetic films attract a great dels of interest in experimental studies and they reveal a variety of interesting structures. In order to model the ferrofluid we use a Stockmayer fluid. The particles interact via a Lennard-Jones potential, combined with a dipole moment. The particles are confined to a plane, whereas the dipoles can rotate in three dimensions. This model represents in an accurate way nanoparticles like colloids that are on an plane. We investigate the influence of an external field on the liquid-gas phase transition. We use extensive Monte-Carlo simulations in the grand canonical ensemble. Long range-interactions are handeled by Ewald summation techniques. Histogram reweighting and preweighted multicanonical simulations are used in order to determine the exact transition curve of the ferrofluid monolayer.