Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Confined Fluids

CPP 12.2: Talk

Tuesday, February 26, 2008, 11:15–11:30, C 230

Fluctuation-induced interaction between ellipsoidal colloids at fluid interafce — •Ehsan Noruzifar and Martin Oettel — Institut fuer Physik, WA 331, Johannes-Gutenberg-Universitaet Mainz,D-55099 Mainz, Germany

One part of the effective interaction between colloids trapped at the fluid interface originates from capillary wave fluctuations. The very presence of colloids at the interface of two fluids restricts the allowed spectrum of long-ranged capillary wave fluctuations, thereby the resulting force is of Casimir-Polder type and adds a long-ranged part to the effective inter-colloidal interaction [1]. This interaction is calculable by integrating over all admissible interface configurations weighted by a capillary wave Hamiltonian. In the present work, the Casimir interaction between ellipsoidal colloids placed at a fluid interface is calculated as an interaction energy between multipole fields on the interface boundaries generated by thermal fluctuations [2]. The results obtained are an explicit example for an anisotropic Casimir force which is caused by the colloid shape.

[1] H. Lehle and M. Oettel, Phys. Rev. E 75, 011602 (2007) ; H. Lehle, M. Oettel, and S. Dietrich, Europhys. Lett. 75, 174 (2006). [2] T. Emig, N. Graham, R. L. Jaffe and M. Kardar, Phys. Rev. Lett. 99, 170403 (2007).