Dresden 2014 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 56: Colloids and Complex Liquids IV
CPP 56.1: Talk
Friday, April 4, 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.