Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 5: Soft Matter I

DY 5.2: Vortrag

Montag, 26. März 2012, 15:15–15:30, MA 004

Capillary wave analysis of crystal-liquid interface in colloidal model systems — •Aleksandar Mijailovic, Roberto E. Rozas, Jürgen Horbach, and Hartmut Löwen — Institut für Theoretische Physik 2, Heinrich-Heine Universität Düsseldorf, Germany

The properties of the crystal-liquid interface of inhomogeneous colloidal systems is determined from molecular dynamic (MD) simulations. Interactions between particles are modeled by the Yukawa pair potential. As a test of consistency of the capillary waves theory (CWT) the interfacial stiffness is calculated for the (100) crystal orientation using two independent methods: (1) from the spectrum of capillary waves at the interface and (2) from the interfacial broadening-effect predicted by the theory [1, 2]. A complete mapping of the interfacial energy as a function of the crystal orientation from the spectrum of height-height correlation of different crystal orientations is obtained. The results obtained in appropriate units are comparable to the hard spheres case. In addition, the kinetic growth coefficients are estimated in growth simulations of different undercoolings.