Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.42: Poster

Tuesday, March 27, 2012, 18:15–20:45, Poster A

Colloidal crystals confined by walls: static and dynamic aspects of structural transitions caused by misfit — •Dorothea Wilms, Peter Virnau, and Kurt Binder — Johannes Gutenberg Universität, Mainz

A two-dimensional colloidal crystal is studied under confinement of structured walls in one direction. Introducing a misfit by placing the walls closer together leads to a structural transition from n rows to (n-1) rows of crystalline particles and the development of soliton-staircases.

This system is investigated using Langevin Dynamics. We discovered an unusual mechanism of diffusion, where groups of particles make a collective circular movement.

The same system has been investigated under shear. Depending on the shear velocity, different effects were observed, ranging from the development of holes in the system to large parts of the crystal changing the orientation of their layers.