Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: Colloids and Complex Liquids I

CPP 42.2: Vortrag

Donnerstag, 25. März 2010, 11:30–11:45, H39

Aggregation phenomena in two-dimensional systems of dipolar colloids with shielded interactions — •Anton Smessaert and Sabine H. L. Klapp — Institut für Theoretische Physik, TU Berlin, 10623, Germany

Employing Molecular Dynamics (MD) simulations we investigate aggregation phenomena and phase separation in a suspension of dielectric colloidal particles in an external field. The system is two-dimensional and the colloids are modeled as soft spheres with induced dipoles. The interaction of the dipoles is shielded in the framework of the Debye-Hückel theory [1]. For comparison we use a shifted dipole-dipole interaction supplemented by a soft sphere potential.

One part of our study is a detailed cluster analysis based on the MD simulations. Also, we employ a second order virial expansion to explore the possibility of a condensation phase transition.

Our results illustrate the influence of the interaction-range on the clustering and phase transition.

[1] S. Tsonchev, G.C. Schatz and M.A. Ratner, Chem. Phys. Lett. 400, 221-225 (2004)