Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 56: Colloids and Complex Liquids IV

CPP 56.1: Vortrag

Freitag, 4. April 2014, 09:30–09:45, ZEU 260

Form fluctuations of polymer loaded spherical microemulsions — •Björn Kuttich¹, Peter Falus², Isabelle Grillo², and Bernd Stühn¹ — ¹Experimental Condensed Matter Physics, TU Darmstadt, Germany — ²Institut Laue-Langevin, Grenoble, France

Spherical microemulsions with the anionic surfactant AOT are well suited as model system with a soft confining geometry. Their structural and dynamical properties are already intensively studied by various scattering methods and the droplet radius, determining the confinement size, can easily be tuned by the precise composition of the microemulsion. A first approach of applying this confinement to complex molecules is the investigation of small simple polymers like PEO in the microemulsions droplets. Besides the influences of the polymer on the phase diagram of the microemulsion, changes in the droplet dynamics are of great interest.

Neutron spin echo spectroscopy is a unique method to investigate the fluctuations of the microemulsions surfactant shell and how they are influenced by the presence of polymers. Droplet phase Water/AOT/Octane microemulsions with different radii and polymer content were investigated at the ILL at IN15, their droplet structure was secured by SANS on D11. Measuring the relaxation rate of the fluctuations the bending modulus of the shell can be determined by hydrodynamic calculations and a softening of the shell with addition of polymer is observed. This finding is complemented by percolation temperature measurements by dielectric spectroscopy.