Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Colloids and Complex Liquids III
CPP 40.5: Vortrag
Donnerstag, 3. April 2014, 12:15–12:30, ZEU 260
Cluster Formation in Systems of Magnetic Cubes at Low Temperatures. — •Joe G. Donaldson1 and Sofia Kantorovich1,2 — 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria — 2Ural Federal University, Lenin av. 51, Ekaterinburg, 620083, Russia.
Colloidal synthesis has progressed to the point where a large array of particle geometries is now readily accessible. For example, recently realised systems of cubic particles now form an active area of research [Meijer et. al, Soft Matter, 2013]. The non-spherical shape of these particles provides a perfect scenario in which to study the consequences of external anisotropy on cluster formation. In addition, an internal anisotropy can be present for particles formed of magnetic compounds. In this work we describe and account for the structures formed in a magnetic cubic colloidal system at low temperatures. Our system is comprised of monodisperse cubes with centrally positioned point magnetic dipoles. Two separate scenarios are considered: one where the dipole orientation is along the [100] crystallographic direction, and the other, along [111]. We present analytical energy calculations in quasi two dimensions of the possible structures formed at 0K. The approach taken here is an extension of that employed for spheres by [Propkopieva et. al, Phys. Rev. E, 2009]. These predictions are compared to replica exchange molecular dynamics computer simulations at low temperatures. The findings of this work are later hoped to aid in the determination of thermodynamic properties of these colloids at room temperature.