Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Colloids and Complex Liquids III
CPP 49.5: Vortrag
Freitag, 15. März 2013, 10:45–11:00, H40
Systems of magnetic anisotropic particles: microstructure and macroproperties — •Elena Pyanzina1 and Sofia Kantorovich1,2 — 1Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia — 2Sapienza, University of Rome, Piazza A. Moro 5, 00185, Rome, Italy
Anisotropic particles form the cutting edge of dipolar soft matter research as they correspond completely to the idea of fine tuning and designing new materials with controllable properties. In this contribution we present a theoretical study and computer simulations of the microstructure and macroproperties of magnetic ellipsoids and cylinders. As the first step, the analysis of the possible ground state structures (the most energetically favoured configurations at 0 K) for two and three dimensions is carried out. Then, we propose a method of calculating analytically the pair correlation function for the combination of Gay-Berne and magnetic dipole-dipole potential based on the group integral technique. An extensive comparison of the theoretical model and the results of molecular dynamics simulations for different semi-axes ratios demonstrated a very good agreement for two and three dimensions for both types of the particles. We conclude, that even slight shape anisotropy can lead to the drastic change in the microstructure and, as a result in macroscopic responses of the system. Changing the asphericity of particles and their density both the ground states and the equilibrium room temperature properties can be tuned and effectively controlled.