Effect of ionic strength on the relation between foam film stabilityand interfacial composition of polyelectrolyte/surfactant mixtures
The stability of foam films in polyelectrolyte/surfactant mixtures determines the efficiency of many of the product formulations we use in our everyday lives including detergents and some foodstuffs. A clear correlation between foam film stability and the surface properties of such mixtures, however, has been missing. Our work on FIGARO has allowed us to relate foam film stability to the changing interfacial composition with respect to the bulk composition - one paper has been published. Recently, we found that not only the interfacial composition but the interfacial structure, and in particular repulsion due to the charge and length scale of the molecules facing the film bulk, to be crucial for foam film stability. Now we have started to extend the project to examine the effect of ionic strength. We have found a strong influence on the interfacial composition and structure with 10^-2 M of inert electrolyte: an extended mixed structure that results in unstable films disappeared. However, we need 2 more days of beam time to complete the study we have started in order to publish a further paper on the effects of ionic strength with respect to the rigidity of the polyelectrolyte.
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BRAUN Larissa; Richard A. Campbell and VON KLITZING Regine. (2017). Effect of ionic strength on the relation between foam film stabilityand interfacial composition of polyelectrolyte/surfactant mixtures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-487
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