Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Poster: Charged Soft Matter

CPP 33.6: Poster

Wednesday, March 13, 2013, 16:30–18:30, Poster C

Adsorption Behavior of Oppositely Charged Polyelectrolyte/Surfactant Mixtures: Neutron Reflectivity from Alkyltrimethylammonium Bromides (CTABs) and poly[tris (hydroxymethy)methyl]acrylamide (PAMPS) mixtures at the Air/Water Interface — •Heiko Fauser, Nora Kristen-Hochrein, Marin Uhlig, and Regine von Klitzing — Technische Universität Berlin, 10623 Berlin, Deutschland

If a polyelectrolyte and a surfactant of opposite charge are mixed, the two ions associate forming a large variety of complexes. Different interfacial adsorption behavior leads to different foaming properties.

Former studies done in our group on mixtures of the negatively charge polyeletrolyte PAMPS with the positively charged CTAB revealed a different adsorption behavior in foam film lamellas and at the air-water interface.

To gain a detailed insight into the structure and composition of the film interfaces, we performed neutron reflectometry measurements at the air/water interface.

Our approach focusses on a fixed surfactant concentration while varying the amount of polyelectrolyte. In order to get information about the composition and layer structure we investigated mixtures of different isotopic contrast. Also the influence of different surfactant chain lengths (C12,C14) and variation in electric charge of the polyelectrolytes are investigated.