Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Complex Fluids and Colloids I (joint session CPP/DY)

DY 3.13: Vortrag

Montag, 12. März 2018, 12:45–13:00, C 264

Crystal-fluid surface tension in the two dimensional binary hard disk mixture, a DFT study — •Shang-Chun Lin and Martin Oettel — Institut für Angewandte Physik, Universität Tübingen, Tübingen, Germany

Using fundamental measure theory, we investigate phase diagrams and crystal-fluid surface tensions in additive and nonadditive two-dimensional hard disk mixtures of small and large spheres with size ratio q. In the nonadditive case, the small disks act as ideal "polymeric" depletants (Asakura-Oosawa model) and the surface tension (for small q) shows a minimum with increasing small sphere concentration. We compared to the additive case, with an interface between fluid and crystals with substitutional disorder, and find a similar behavior (for small q). For larger q, the surface tension is almost constant upon adding the small spheres. In these investigations, the fluid-solid transitions were first-order due to the assumption of a periodic unit cell in the DFT calculations. We examine the possibility of relaxing this assumption and finding a hexatic phase in fundamental measure theory.