Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: Colloids and Complex Liquids II
CPP 43.7: Talk
Thursday, March 25, 2010, 15:45–16:00, H39
Critical Casimir Forces in Binary Colloidal Suspensions — •Olga Zvyagolskaya1 and Clemens Bechinger1,2 — 12. Physikalisches Institut, Universität Stuttgart — 2Max-Planck-Institut für Metallforschung, Stuttgart
We investigate the behavior of a dense two-dimensional colloidal system immersed in a critical binary liquid mixture of water and 2,6-lutidine in front of a plane surface. Close to the critical point critical Casimir forces arise whose sign and amplitude strongly depend on the temperature and the preferential adsorption properties of the surfaces. In our experiments we study the behavior of a binary mixture of colloidal particles with opposite preferential adsorption properties. Owing to their different Casimir interaction with the substrate, this leads to different particle motilities. As a function of the temperature, the relative particle concentrations and the preferential adsorption properties of the substrate we find a large variety of metastable structures.