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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Poster: Colloids and Complex Liquids
CPP 38.25: Poster
Wednesday, March 16, 2011, 17:00–19:00, P2
Critical Casimir Forces in Colloidal Suspensions of Janus Particles — •Olga Zvyagolskaya1 and Clemens Bechinger1, 2 — 1Universität Stuttgart — 2Max-Planck-Institut für Metallforschung, Stuttgart
We investigate the behavior of a two-dimensional colloidal system of Janus particles immersed in a critical binary liquid mixture of water and 2,6-lutidine. Janus particles, i.e. particles with antipodal preferential adsorption properties for the two components of the mixture were created by silica particles with a chemical anisotropy. Close to the critical point, critical Casimir forces arise between the particles whose amplitude and sign strongly depend on the temperature and the relative particle orientation. Due to the strong non-isotropic character of these forces, we observe a large variety of colloidal structures in such systems.