Critical Casimir forces involving a chemically structured substrate

Abstract

Motivated by recent experiments with confined binary liquid mixtures near their continous demixing phase transition we study the critical behavior of a system, which belongs to the Ising universality class, for the film geometry with one planar wall chemically structured such that there is a laterally alternating adsorption preference for the species of the binary liquid mixture. By means of Monte Carlo simulations and finite-size scaling analysis we determine the critical Casimir force and the corresponding universal scaling function.

5 pages, 3 figures, ws-procs9x6 class. Contribution to the proceedings of QFEXT09, Norman (OK), USA, 21-25 September 2009

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