Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Poster: Colloids and Complex Liquids

CPP 38.25: Poster

Mittwoch, 16. März 2011, 17:00–19:00, P2

Critical Casimir Forces in Colloidal Suspensions of Janus Particles — •Olga Zvyagolskaya¹ and Clemens Bechinger^{1, 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.