Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Poster: Colloids and Complex Liquids
CPP 16.23: Poster
Dienstag, 27. März 2012, 18:15–20:45, Poster A
Interactions between PEG and non-ionic surfactant layers — •Andreas Weber, Andreas Barz, Tinka Spehr, and Bernd Stühn — Experimentelle Physik kondensierter Materie, Technische Universität Darmstadt
The interactions between polymers and soft surfactant layers are subject of current research interest. One system to study these interactions are microemulsions, thermodynamic stable mixtures of a polar liquid and a non-polar liquid stabilized by a surfactant. Depending on the composition of the system, these microemulsions can form various structures. One of these structures is the droplet phase. There, droplets of one component are dispersed in a matrix of the other component. We examine the phase diagrams of water in oil droplets stabilized by a non-ionic surfactant (C12E5, C12E4) to characterize the initial system by small angle X-ray-scattering and light transmission experiments. We add the hydrophilic polymer PEG to the microemulsion to investigate the interactions between these polymers and the curved surfactant layer of the droplets: While scattering experiments provide information about the structure of the interface, dynamic light scattering and dielectric spectroscopy give results concerning the dynamics of the droplets and the interface. Furthermore, by changing temperature it is possible to force the initial system into a lamellar phase. We also examine the effect of adding polymer to those structures.