Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster: Colloids and Complex Liquids

CPP 20.3: Poster

Dienstag, 12. März 2013, 18:15–20:15, Poster C

Dielectric spectroscopy of spherical Water/AOT/Decane microemulsions in the GHz regime — •Björn Kuttich, Robert Wipf, and Bernd Stühn — Experimental Condensed Matter Physics, TU Darmstadt, Germany

Microemulsions are widely used ternary mixtures in industrial as well as fundamental research. Besides structural properties like the temperature depending shape and size of the microstructure, the dynamics of the microemulsions, especially in the spherical phase are of great interest. Focusing on spherical microemulsions in particular it is possible to change the properties of the existing surfactant shell by adding e.g. polymers either to the core or the matrix phase of the system. Investigating such polymer loaded spherical microemulsions slid into focus of recent research because they can be considered a model systems for the interaction between proteins and cell membranes.

Broadband dielectric spectroscopy is a commonly used method to investigate the dynamics of microemulsions. Using AOT based water in oil microemulsions it is possible to observe in addition to an enormous temperature dependency of the conductivity due to dynamic percolation also dielectric relaxations. The shell relaxation resulting from ion reorganisation in the surfactant shell evolves to the so called cluster relaxation while approaching the percolation temperature, which in turn can be influenced by adding different polymers. Following this relaxation up to the GHz regime allows now to investigate closer the formation of clusters during the percolation process.