Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 12: POSTER Colloids, Nanoparticles and Self-Organizing Systems

CPP 12.24: Poster

Tuesday, March 28, 2006, 17:00–19:00, P3

Capillary-induced interactions between colloids at an interface — •Martin Oettel^1,2, Alvaro Dominguez³, and Siegfried Dietrich^1,2 — ¹MPI für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany — ²ITAP, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart — ³Física Teórica, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain

Within a general framework we study the effective, deformation-induced interaction between two colloids trapped at a fluid interface. For mechanically non–isolated systems, the effective interaction is logarithmic in the separation d, for isolated systems it follows a shorter–ranged power-law. As an application, we consider the interface deformation owing to the electrostatic field of charged colloids. Both the attractive, effective interaction and the direct electrostatic repulsion decay as d⁻³. An attractive minimum in the total potential at intermediate separations is possible only for large enough colloidal charges.