Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 47: Heterogeneous Nucleation and Microstructure Formation (related to SYMF, jointly with MM)

CPP 47.4: Vortrag

Freitag, 18. März 2011, 11:15–11:30, ZEU 160

Heterogeneous nucleation at a flat wall in a hard sphere colloidal model system — •Markus Franke und Hans Joachim Schöpe — Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudinger Weg 7, 55099 Mainz

The hard sphere system is the simplest model system studying crystallization. Experimentally it can be realized using steric stabilized colloids. We studied the kinetics of homogeneous and wall induced heterogeneous nucleation in colloidal hard spheres as function of super saturation. Using light scattering and microscopy we can determine the time trace of the absolute crystal volume, the crystal size as well as the nucleation rate density. We show that homogeneous nucleation is mediated by precursors, while wall induced crystallization is induced by a layering at the cell wall leading to a different crystallization kinetics of wall and bulk crystals.