Berlin 2015 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Focus: Field Controllable Functional Polymers II
CPP 13.2: Talk
Monday, March 16, 2015, 15:15–15:30, C 264
Theoretical study of Janus-like magnetic particles at low temperature — •Ekaterina Novak1, Elena Pyanzina1, and Sofia Kantorovich1,2 — 1Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia — 2University of Vienna, Sensengasse 8, 1090, Wien, Austria
Application of complex innovation methods in the field of magnetic materials led to a synthesis of magnetic Janus particles [Zhao and Gao, Adv. Mat., 2009; Smoukov et al., Soft Matter., 2009]. The two faces of magnetic Janus particles are the magnetic and nonmagnetic hemispheres. Applying an external electric or magnetic field one can assemble such magnetic Janus particles in staggered chains, chain-like or mesh-like superstructures and double and staggered chains. Driving the rotations of such colloids opens new perspectives in biomedical and technological applications. Here we present a theoretical study of Janus-like magnetic particles at low temperature. We would aim at investigating only one possible dipolar orientation and use the shift of the dipole, which in Janus particles correspond to the size of the magnetic side, as a control parameter to investigate both ground state structures and thermodynamically equilibrium self-assembly. To describe the basic features of the Janus-type magnetic colloids, we put forward a simple model of a spherical particle with a dipole moment shifted outwards the centre and oriented perpendicular to the particle radius. Using direct calculations and molecular dynamics computer simulations, we investigate the ground states of small clusters and the behaviour of bigger systems at low temperature.