Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 5: SYMPOSIUM: Dynamics of multi-component fluids POSTER
CPP 5.23: Poster
Freitag, 4. März 2005, 17:15–19:00, Poster TU D
Modification of forces in aqueous wetting nanofilms — •Katarzyna Ciunel1 and Regine v. Klitzing2,3 — 1Stranski-Laboratorium, TU Berlin — 2MPI f. Kolloid- und Grenzflächenforschung, Potsdam — 3Institut f. Physikalische Chemie, CAU Kiel
Thin liquid films are the building blocks of many macroscopic systems (e.g. foams, emulsions), and they affect the stability and functions of these systems. The forces between the opposing interfaces depend on the composition of the film interfaces and of the film fluid. The sum of interactions between the film surfaces is determined quantitatively by the disjoining pressure isotherm (disjoining pressure in dependence vs. film thickness) and it is measured by varying the outer pressure in a so-called thin film pressure balance. The approach of a solid substrate to one of the film interfaces (wetting film) changes the drainage behaviour with respect to a free-standing film. The opposing air/water interface is varied by the adsorption of different amphiphiles. In order to modify the interactions between the fluid and the interface, the solid surface is pre-coated by polyelectrolytes of different charge. The factors dominating the stability are figured out by static and drainage measurements.