Dresden 2014 – scientific programme

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BP: Fachverband Biologische Physik

BP 41: Biomaterials and Biopolymers II (joint CPP/BP)

BP 41.5: Talk

Thursday, April 3, 2014, 16:00–16:15, ZEU 222

Structure/Property-Correlation of Alinate-Surfactant Mixtures at the Water Surface — •Patrick Degen¹, Victoria Jakobi², Michael Paulus¹, and Metin Tolan¹ — ¹Fakultät Physik/DELTA, TU Dortmund, Germany — ²Analytical Chemistry - Biointerfaces, Ruhr-Universität Bochum, Germany

Usually soft colloids, such as emulsion droplets or foam bubbles are stabilized by adsorbed layers of surfactants, polymers and mixtures of both. In recent years industrial researchers focus on polymers that are biocompatible such as gum acacia, chitosan or alginate. Such mixtures are found in pharma-ceutical and food applications, in cosmetic products, detergents, and so forth. Nevertheless, the knowledge of basic properties of oil-water interfaces stabilized by surfactant-polymer mixtures is challenged by the complexities of the interactions involved. We present complementary investigations of surface tension and surface rheology properties on the alginate/surfactant system. In combination with dynamic light scattering and fluorescence spectroscopy this work provides new insights into the interactions between alginate and different surfactants in bulk and at the interface. Additionally, X-ray reflectivity measurements give information about the microscopic structure of such interfacial films. We demonstrate that some of the characteristic rheological features related to polymer - surfactant associations correlate with the X-ray reflectivity results, where the formation of large-scale complexes, depending on the surfactant concentration was observed.