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DY: Fachverband Dynamik und Statistische Physik

DY 25: Critical Phenomena and Phase Transitions

DY 25.3: Talk

Thursday, March 14, 2013, 10:00–10:15, H46

Critical Casimir forces between homogeneous and chemically striped surfaces — •Francesco Parisen Toldin¹, Matthias Tröndle², and Siegfried Dietrich² — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg — ²Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart

Recent experiments have measured the critical Casimir force acting on a colloid immersed in a binary liquid mixture near its continuous demixing phase transition, and exposed to a chemically structured substrate. Motivated by these experiments, we study the critical behavior of a system, which belongs to the Ising universality class, for the film geometry with one planar wall chemically striped, such that there is a laterally alternating adsorption preference for the species of the binary liquid mixture. By means of Mean-Field theory, Monte Carlo simulations and finite-size scaling analysis we determine the critical Casimir force and the corresponding universal scaling function.