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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.14: Poster

Montag, 16. März 2020, 17:30–19:30, P3

Influence of added salt on the foam film properties of NaPSS/C14TAB-mixtures — •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 in personal care products and in food technology.

To understand the properties of macroscopic foam, it is essential to investigate foam films - the framework of foams.

Due to the formation of highly surface-active complexes, mixtures of oppositely charged polyelectrolytes and surfactants are widely used in many industrial applications. There exist many studies that focus on a big variety of surfactant-polyelectrolyte mixtures. However, the influence of the ionic strength - especially on the foam films - is still unclear.

In this work, a thin film pressure balance (TFPB) is used to study foam films of NaPSS/C14TAB-mixtures in terms of disjoining pressure, surface potential and foam film stability. We add NaBr (the combination of the two counterions) to get insights on the influence of the ionic strength on the foam film properties. Our current investigation shows an unexpected increase in foam film stability with added NaBr which might be explained by a change of the conformation of NaPSS at the air/water interface. To study the effects of the presence of NaBr in detail, the NaBr concentration is further varied.