Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Posters II
DY 29.29: Poster
Donnerstag, 29. März 2012, 17:00–19:00, Poster A
Critical Casimir forces in many-body systems — •Thiago Mattos1, Ludger Harnau1,2, and Siegfried Dietrich1,2 — 1Max-Planck-Institut für Intelligente Systeme, Stuttgart, Deutschland — 2Institut für Theoretische und Angewandte Physik, Stuttgart, Deutschland
The confinement of a binary liquid mixture close to its critical (demixing) point leads to effective critical Casimir forces between the confining boundaries. These long-ranged forces can be either attractive or repulsive depending on the choice of the boundary conditions, i.e. the preference of the confining surfaces in adsorbing one of the two components of the liquid mixture. We investigate the effect of many-body interactions in the Casimir force, which is expected to be non-additive, for two spherical colloids close to a wall immersed in a binary liquid mixture close to criticality. We calculate this force for three different systems: (i) single spherical colloid close to a wall, (ii) two spherical colloids and (iii) two spherical colloids close to a wall. For all systems we consider several combinations of boundary conditions for the colloids and for the wall.