Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Poster: Colloids and Complex Liquids
CPP 38.35: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Bidisperse monolayers: what changes in 2D? — •Elena Minina1, Alla Dobroserdova1, Joan Cerda2, Sofia Kantorovich1,3, and Christian Holm3 — 1Ural State University, Lenin av. 51, Ekaterinburg, 620000, Russia — 2Institute for Cross-Disciplinary Physics and Complex System, Campus Universitat de les Illes Balears, 07122, Palma de Mallorca — 3Institute fuer Computerphysik, Universitaet Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Deutschland
Ferrofluid microstructure in the absence of an external magnetic field proves to be a function of two main parameters: ferroparticle density and intensity of the magnetic dipole-dipole interparticle interaction. It is also well known, that inherent polydispersity of ferroparticles makes the investigation of the structural transition in ferrofluids even more difficult. Earlier it was proposed to replace a continuous particle size distribution by a model bidisperse one [Ivanov et al, Phys. Rev. E, 2004]. The latter theoretical model provided a very good qualitative agreement on the ferrofluid microstructure with the simulation data [Holm et al, J. Phys: Condense Matter., 2006]. However, direct application of this approach to the description of ferrofluid monolayers (quasi-2D systems of ferroparticles [Klokkenburg et al., Phys. Rev. Lett., 2006]) failed and resulted in the regular qualitative discrepancies with the simulation data. In the present study we modify the free energy functional and show why the interplay of energy and entropy changes significantly ferrofluid microstructure in monolayers.