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 47.5: Vortrag

Freitag, 18. März 2011, 11:30–11:45, ZEU 160

Heterogeneous nucleation in colloids with spherical interaction — •Hans Joachim Schöpe — Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudinger Weg 7, 55099 Mainz

Understanding the process that drives a metastable liquid or fluid to the crystal state is still a challenging issue for condensed matter physics. One promising approach to the problem is offered by the study of colloidal suspensions of particles with spherical interaction. Identifying the colloidal particles as macroatoms close analogies to atomic systems are observed. Colloids offer, compared to true atomic systems, a number of advantages. On one side, the interaction potential in colloidal macroatoms can be finely controlled and tuned by the experimentalists, by engineering the properties of the particles, and/or changing the characteristics of the dispersing medium. On the other side, typical length and time scales of colloidal systems allow time-resolved observations of solidification with easily manageable experimental techniques such as microscopy and light scattering. In particular it is possible to study the competition between homogeneous and heterogeneous nucleation induced by container walls or by seeds. The results of various experiments on colloids with various interaction will be presented together with their analysis within the framework of classical theory.