Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster: Colloids and Complex Liquids
CPP 20.7: Poster
Dienstag, 12. März 2013, 18:15–20:15, Poster C
Pressure calculation for polydisperse magnetic fluids — •Elena Minina1,2, Ekaterina Novak1, 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 — 3Sapienza University of Rome, Piazzale A. Moro 5, 00185, Rome, Italy
Magnetic fluids (the systems of magnetic dipolar particles suspended in nonmagnetic liquids) possess a wide range of physical properties which are currently under study. Typically, the synthesis of industrial magnetic fluids leads to a broad particle size distribution or so-called polydispersity of the system. Even in the absence of an external magnetic field the polydispersity plays a crucial role in cluster formation and significantly changes the microstructure of magnetic fluids what is confirmed by the work [C. Holm at al, J. Phys.: Cond. Mat. 18 (2006)]. In the present study we would like to elucidate how polydispersity influences one of the experimentally measurable macroscopic properties such as pressure of the system. We consider bidisperse system of magnetic dipolar soft or hard particles as the simplest case of polydisperse magnetic fluid. For such system we perform theoretical calculation of pressure using method of diagram expansion that is in a good agreement with data obtained via by molecular dynamics simulations in ESPResSo. The final analysis of pressure for bidisperse system confirms that the pressure is very sensitive to the polidispersity of the system.