Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.20: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Surface Properties of Catanionic Mixtures — •Heiko Fauser, Martin Uhlig, and Regine v. Klitzing — Stranski-Laboratorium, Department of Chemistry, TU Berlin, Straße des 17. Juni 124 D-10623 Berlin, Germany

Mixtures of oppositely charged surfactants show a strong synergism. It allows reducing the required amount of surfactant, which makes catanionic surfactant mixtures eco-friendly. Thus, these mixtures are of great interest for a broad field of applications like detergency, oil recovery, food technology and drug delivery. Furthermore, foam stability can be increased with these mixtures, since the formation of surface active complexes and aggregates strongly increases the adsorption at liquid-air interfaces.

Literature shows that mixtures of surfactants with unequal chain length have different surface properties in comparison to mixtures with equal chain length. Thus, the focus of our study is on the influence of the surfactant alkyl chain length on the foam properties. In our work catanionic mixtures from two widely used surfactant types, sodium alkyl sulfates and quarternary alkylammonium bromides are investigated. To describe the adsorption of the aggregates at the liquid-air interface both the surface tension and the surface elasticity of mixtures with both matching chain length and mismatching chain length are investigated. Studies about the correlation between adsorbed amount of surfactants, interactions in thin foam films, foam ability and foam stability are in progress.