Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.42: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Pressure calculation for bidisperse magnetic fluids — •Ekaterina Novak1, Elena Pyanzina1, Elena Minina1,2, and Sofia Kantorovich1,3 — 1Ural Federal University, Lenin av. 51, Ekaterinburg, 620000, Russia — 2Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569, Stuttgart, Germany (current place of work) — 3University of Vienna, Sensengasse 8, 1090, Wien, Austria
Magnetic fluids are the systems of magnetic dipolar particles suspended in nonmagnetic liquids. Being a liquid even under the influence of magnetic field, ferrofluids are attractive for theoretical and experimental investigations. Industrially synthesized ferrofluids usually have high degree of polydispersity, i.e. the particle size distribution is rather broad. In the work [C. Holm et al, J. Phys.: Cond. Mat. 18 (2006)] it was shown that polydispersity influences microscopic properties of ferrofluids dramatically. Even for bidisperse systems an extensive cluster formation was inhibited by the poisoning effect. Thus, the polydispersity should lead to a change of the macroscopic properties. The present study is devoted to elucidation of the question how polydispersity influences one of the experimentally measurable macroscopic properties such as pressure of the system. We consider bidisperse systems of magnetic dipolar soft or hard particles as the simplest models of polydisperse magnetic fluid. We employ MD simulations, using ESPResSo, in combination with theoretical calculations of pressure based on the method of diagram expansion. In this way we investigate the influence of polydispersity and dipolar interactions on the compressibility of the system.