Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: POSTERS Rheology
CPP 7.11: Poster
Monday, February 25, 2008, 16:45–19:00, Poster A
Fluids in confinement: Dynamics of Foam Film Thinning — Silke Stöckle1, •Rumen Krastev1, Georgi Georgiev2, and Helmuth Möhwald1 — 1Max Planck Institut für Kolloid- und Grenzflächenforschung, 14424 Potsdam/Golm, Deutschland — 2University of Sofia, Deptment of Biochemistry, Sofia, Bulgaria
The thinning dynamics of foam films have become of interest and we are utilising this as a tool to study the behaviour of liquid in confinement. We show results on the dynamics of thinning of foam films stabilised by Dodecyl-D-Maltoside (C12G2) and by DMPG.
The results show the strong influence of the C12G2 concentration on the film thinning.The films formed from solutions with low surfactant concentration reveal a high speed of film thinning which is much slower above a critical threshold surfactant concentration. The theoretical models describe the thinning process well only down to a certain thickness below which the film thins faster than theory predicts. The discrepancy could be explained by introducing an additional term to the classical DLVO theory which counts for the short range interactions or considering the properties of liquids in confined volumes.The films prepared from the lipid DMPG show complex thinning behaviour at different temperatures. The peculiarities complement well to the changes of the bulk properties of the lipid dispersions at the studied temperatures.