Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: POSTER: Micro and Nano Fluidics

CPP 19.12: Poster

Mittwoch, 28. März 2007, 16:00–18:30, Poster B

Thinning Dynamics of Foam Films from Dodecyl Maltoside (C12G2) — •Silke Stöckle, Rumen Krastev, and Helmuth Möhwald — Max-Planck Institute of Colloids and Interfaces, Potsdam/Golm, Germany

The surface dimensions of foam films range between micrometers and meters while their thickness is in the range of nanometers. These dimensions make the films a valuable system to study the behaviour of liquids in confined geometries. Foam films are liquid films which separate two gas phases. Thin foam films are stabilised by surfactants and consist of two surfactant monolayers in contact with an aqueous core. In order to understand time dependant changes in colloidal systems like the formation of aggregates, or the flow of colloids through micro-channels, the dynamics of film thinning is a crucial aspect to investigate. During the process of thinning, the distance between the film surfaces becomes substantially smaller than the interfacial zone around the surfaces. The interaction of the film surfaces changes not only the diffusion of the molecules adsorbed at the film surface but as well the viscous-elastic properties of the bulk. The contribution shows results on the thinning dynamics of films stabilised by C12G2. The experiments were performed using the *dynamic method* technique. Up-to-date analysis was used to obtain the influence of the film surface dynamic properties on the film thinning. The results show the influence of the surfactant density on the film thinning process.