Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 29: Colloids and Complex Liquids I
CPP 29.9: Vortrag
Mittwoch, 2. April 2014, 11:45–12:00, ZEU 114
Magnetic Janus Particle: What Can a Toy Model Show? — •Ekaterina Novak1 and Sofia Kantorovich1,2 — 1Ural Federal University, Lenin av. 51, Ekaterinburg,620000, Russia — 2University of Vienna, Sensengasse 8, 1090, Wien, Austria
The term Janus particle was introduced already 20 years ago in [Casagrande et al., Acad. Sci. II, 1988], whereas magnetic Janus particles were synthesized only recently [Zhao et al., Adv. Mater., 2009], [S. K. Smoukov et al, Soft Matter, 2009] and it has attracted considerable attention in literature because of their unique properties, especially, in the presence of an external magnetic field [Ruditskiy et al., Soft Mater, 2013]. Magnetic Janus particles are usually micron sized and have 2 "sides", in our case - half of the particle is made of a magnetic material, and the other half of silica. The analytical microstructure investigation methods and theoretical analysis of these systems is not yet fully worked out. However, due to the similarities, one can extend and use methods for capped colloids and regular magnetic fluids (see above) to handle the systems of magnetic Janus particles both at low and room temperatures. So we propose a simple toy model in which the spherical particle is divided into two hemispheres one of which contains a point dipole parallel to the division plane. We employ computer simulations and two different theoretical approaches (DFT and ground-sate calculations) to understand the influence of the dipolar position and dipole-external field coupling on the cluster topology and cluster-size distributions.