Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster: Colloids and Complex Liquids

CPP 20.11: Poster

Tuesday, March 12, 2013, 18:15–20:15, Poster C

Network formation in polydisperse colloidal systems induced by an uni-axial external field — Heiko Schmidle, Sebastian Jäger, •Florian Kogler, and Sabine H.L. Klapp — Institut für Theoretische Physik, TU Berlin, Hardenbergstr. 36, D-10632 Berlin, Germany

Using Molecular Dynamics and Monte Carlo simulations we investigate a theoretical model of two-dimensional colloids with one or two (anti-parallel orientated) induced dipole moments mimicking recent experiments on mixtures of polysterene colloids with and without gold patches in the presence of an external electric field [1]. Such systems percolate in field direction and perpendicular to it. We are able to determine percolation transitions for both cases and identify basic connection types of different colloids [2]. Furthermore the percolated model system shows strongly hindered translational dynamics indicating gelation.

[1] S. Gangwa, A. Pawar, I. Kretzschmarb and O. D. Velev, Soft Matter, 6:1413-1418 (2010)

[2] H. Schmidle, S. Jäger, C. K. Hall, O. D. Velev, and S. H. L. Klapp, Two-dimensional colloidal networks induced by a uni-axial external field, submitted (2012)