Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Poster: (Hydrogels) and Elastomers

CPP 27.7: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Tracer diffusion in hydrogels — •Peter Kosovan, Olaf Lenz, and Christian Holm — Institute of computational physics, University of Stuttgart, Germany

In this work we consider the diffusion behaviour of a simple spherical tracer particle in polymer networks of hydrogels. There have been hints detained via Fluorescence Correlation Spectroscopy on anomalous diffusion of FCS tracer particles in a hydrogel. We investigate by means of MD simulation the diffusion properties of a tracer particle in the presence of polymer chains with which it interacts. With a sufficiently strong tracer-polymer interaction, subdiffusive behaviour is observed on intermediate time scales and normal diffusive on long time scales. The observation is rationalised via a simple two-state model.