Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.11: Poster

Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A

Quantitative test of Mode Coupling theory for quasi-hard spheres — Fabian Weyßer¹, Antonio Puertas², Thomas Voigtmann³, and •Matthias Fuchs¹ — ¹Universität Konstanz, Fachbereich Physik, Germany — ²Universidad de Almería, Departamento de Física Aplicada, Spain — ³University of Edinburgh, School of Physics, Great Britain

Mode Coupling Theory (MCT), describes a dynamical phase transition to a glassy state for colloidal suspensions and molecular liquids. As only input to the theory the static structurefactor of the system is being used. The polydisperse hard sphere system is one of the simplest model system: While polydispersity prevents crystallization the system still exhibits a glass transition. Numerical solutions of the MCT equations were calculated for a Molecular Dynamics (MD) system of polydisperse quasi hard spheres. The structurefactor input originated from this MD system. The MCT solutions and the MD output were compared with special attention to the behavior of one and multi-component MCT calculations. The interesting dynamic quantities in these systems are the fluctuating density correlations describing the structural relaxation.

Fits to the dynamic output of the MD system were performed with the MCT results with the packing fraction as only fit parameter.

The final decay of the density correlations can be described better by multi-component systems than by one-component systems.