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CPP: Chemische Physik und Polymerphysik

CPP 16: POSTER: Computational Physics, Complex Systems

CPP 16.15: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

Comparison of forces in free-standing films and wetting films — •Regine v. Klitzing and Kasia Ciunel — Stranski-Laboratorium, TU Berlin, Strasse d. 17. Juni 112, 10623 Berlin

Thin aqueous surfactant films give the opportunity to study the interactions between two opposing interfaces. The sum of interactions between the film surfaces is determined quantitatively by the disjoining pressure (disjoining pressure vs. film thickness) and is measured by varying the outer pressure in a so-called thin film pressure balance. To study the effect of interfaces the results of foam films (two air/liquid interfaces) and wetting films (one air/liquid interface and one solid/liquid interface) will be compared. In dependence on the surface charge a transition from a Common Black Film (CBF, thickness determined by DLVO forces) to a Newton Black Film (NBF, thickness determined by steric forces) can be induced or avoided. This has a decisive effect on the film stability.