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BP: Fachverband Biologische Physik

BP 40: Colloids and Complex Fluids II (Joint Session CPP/BP/DY)

BP 40.3: Vortrag

Mittwoch, 22. März 2017, 11:00–11:15, ZEU 260

Demixing and clustering in a binary system of long-ranged capillary interactions — •Malte Lütje, Johannes Bleibel, and Martin Oettel — Institut für Angewandte Physik, Universität Tübingen, Deutschland

We consider a binary system of micron-sized spherical colloidal particles trapped at a fluid interface, which induces long-ranged capillary interactions. If one species has positive and one has negative buoyancy, colloids of the same species attract while different species repel. This leads to the demixing of initially uniform densities, and ultimately to the formation of close-packed clusters for each species. Demixing competes with the clustering of each species.

We present static phase diagrams for the system. Brownian Dynamics simulation results illustrate the evolution from a homogeneous state to the demixed and clustered states. The system has unusual phase separation dynamics: The timescales of demixing and clustering can be different, yielding an intermediate stage with halo-like structures.