Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 52: Biomaterials and Biopolymers (joint session with BP) II
CPP 52.5: Vortrag
Donnerstag, 3. April 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.