Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Charged Soft Matter, Polyelectrolytes and Ionic Liquids II
CPP 50.4: Vortrag
Mittwoch, 14. März 2018, 15:45–16:00, C 243
Effect of Salt on the Surface Absorption and Structures of aqueous Polyelectrolyte/Surfactant Mixtures at the air/water Interface — •Larissa Braun1, Richard Campbell2, and Regine von Klitzing1 — 1TU Darmstadt, Darmstadt, Germany — 2Institut Laue-Langevin, Grenoble, France
The surface properties of mixtures of polyelectrolyte and oppositely charged surfactant play an important role in colloidal dispersions (foams, emulsions) e.g. for cosmetics, cleaning products and in food technology.
This work focuses on the effect of salt (LiBr) on the adsorption behavior of mixtures of the anionic polyelectrolyte sPSO2-S220 with the cationic C14TAB. Neutron reflectometry experiments including extensive contrast matching were performed to get insight into the exact composition and structure of the adsorbed polyelectrolyte/surfactant complexes at the air/water interface.
There is no linear relation between surface composition and bulk composition. The salt influences both the surface composition as well as the formed structures at the surface.