Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Colloids and Complex Liquids II

CPP 34.5: Talk

Thursday, March 29, 2012, 16:15–16:30, C 130

Fixing contact angles in model colloid-polymer mixtures — •Antonia Statt, Alexander Winkler, Peter Virnau, and Kurt Binder — Institute of Physics, JGU Mainz , 55128 Mainz

We study a continuous version of the Asakura-Oosawa model with grandcanonical simulations as a model system for colloid-polymer mixtures. By applying a novel computational scheme with a "mixed Hamiltonian" the system is slowly driven from bulk to planar confinement and vice versa, and we are able to determine interfacial free energies with respect to walls and contact angles. By varying the colloid-wall interaction range while leaving the polymer-wall interaction constant, we are able to fix arbitrary contact angles ranging from complete wetting of colloids to complete wetting of polymers at the wall. These investigations may not only guide future experiments but also form the basis for the study of heterogeneous nucleation in complex geometries such as cylindrical and spherical confinement.