Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Soft Matter II
DY 32.7: Talk
Friday, March 30, 2012, 11:30–11:45, MA 144
Charged Colloids under Gravity — •Erdal Celal Oǧuz1, René Messina2, and Hartmut Löwen1 — 1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany — 2Laboratoire de Chimie et Physique - Approche Multi-Echelle des Milieux Complexes, Université de Lorraine, Institut de Chimie, Physique et Matériaux (ICPM), 1 Bld Arago, 57078 Metz - Cedex 3, France
In the ongoing presentation we report the structural solid-solid transitions of purely repulsive colloidal particles under gravity. We perform Monte Carlo simulations, where the constitutive particles are governed by the Yukawa pair interaction and the colloids are initially confined onto a hard planar surface by the gravity. For sufficiently high gravitational strengths particles are arranged in a riangular monolayer lattice. Reducing the gravitational strength leads to more layers of the same symmetry but less particle density, a superlattice respectively. Thus, our model enables a controlled layering mechanism. Furthermore, theoretical predictions are proposed to characterize the monolayer-multilayer transitions.