Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Crystallization and Self Assembly

CPP 13.6: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Crystallization kinetics in colloidal model system obtained by small angle light and bragg scattering - a comparison. — •Richard Beyer, Markus Franke, Thomas Palberg, and Hans Joachim Schöpe — Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudinger Weg 7, 55099 Mainz, Germany

We study the crystallization kinetics of spherical colloidal particles with a hard-sphere interaction. The particles are composed of cross-linked polystyrene with a linker/monomer-ratio of 1/10 and are suspended in 2-Ethylnaphtalen with a volume fraction near the melting concentration.

The Bragg light scattering setup allows us to measure a q-range from 4 up to 20 1/um. Further on we have constructed a second machine to measure the scattered light in the small-angle-regime up to 0.7 1/um. Both systems are capable of measuring the full azimuth-angle with a high resolution on the q- and the time-scale giving excellent statistics which allows us to study the crystallization kinetics of our samples.

We present a comparison of the different scattering techniques and of the determined parameters describing the crystallization scenario. The combination of both techniques gives us the possibility to get a comprehensive picture of the crystallization process in colloidal model systems.