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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.14: Poster
Montag, 1. April 2019, 17:30–19:30, Poster B1
Foam film properties of NaPSS/C14TAB-mixtures: Effect of added Salt — •Kevin Gräff, Larissa Braun, and Regine von Klitzing — Technische Universität Darmstadt, Soft Matter at Interfaces, Darmstadt, Germany
The properties of foams are of interest in many applications such as food technology, firefighting and in personal care products. To understand the properties of macroscopic foams it is important to investigate the single building blocks of it the so-called foam films, which separate the air bubbles from each other. Mixtures of oppositely charged polyelectrolytes and surfactants are widely used in industrial applications as they form highly surface active complexes. Many studies focus on different surfactant, different polyelectrolytes and their rations. However, the influence of the ionic strength - especially on the foam films - is still unclear. In this work, we use a thin film pressure balance (TFPB) to study the foam films of NaPSS/C14TAB-mixtures in terms of the disjoining pressure inside the foam films, the surface potential at the air/water interface and the foam film stability. We add NaBr (the combination of the two counterions) to get insights on the effect of the ionic strength on the foam film properties.