Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Focus: Magnetic Soft Matter II

CPP 20.4: Talk

Wednesday, March 25, 2009, 10:30–10:45, ZEU 222

Phase transitions and ordering of confined magnetic fluids in applied magnetic fields — •Istvan Szalai¹ and Siegfried Dietrich^2,3 — ¹Institute of Physics, University of Pannonia, H-8201 Veszprem, PO Box 158, Hungary — ²Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, D-70569 Stuttgart, Germany — ³Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart, Germany

For the case of the presence of a magnetic field we apply a modified mean-field density functional theory to determine the phase behavior of magnetic fluids in slit-like pores formed by two parallel walls with identical substrate potentials. The magnetic fluid is modeled by the Stockmayer interaction potential. A Carnahan-Starling equation of state based fundamental-measure theory is employed to incorporate the effects of short-ranged hard sphere-like correlations while the long-ranged contributions to the fluid interaction potential are treated perturbatively. The ferromagnetic liquid - ferromagnetic vapor first-order phase transitions and the structural properties of both phases are investigated. The magnetization and susceptibility of the magnetic fluids are also studied. We discuss how the phase diagrams are shifted and distorted upon varying the field strength and the pore width.