Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.40: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Percolation transition of colloids in confined geometry — •Helge Neitsch and Sabine H. L. Klapp — Institut für Theoretische Physik, TU Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany

We have performed grand canonical Monte-Carlo simulations to investigate the percolation transition of a system consisting of colloidal particles in the bulk as well as in a slit pore system, where the particles are confined by two plain, smooth and parallel walls. The colloidal interaction is simply modeled via a square well potential with a short range of attraction of 4% of the hard core diameter. The percolation transition is linked to interesting physical properties like colloidal gelation, conductivity or the connectivity of cavities within porous media. In agreement with a recent publication [1] our results lead to the finding, that the critical exponents of the bulk and of the confined system are deviating from those of the 2D or 3D random percolation class. We furthermore present results for the influence of the wall separation on the locus of the percolation threshold [paper in preparation].

[1] J. Skvor and I. Nezbeda, Mol. Phys. 109, 133-139 (2011)