Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 45: Soft Matter

DY 45.3: Vortrag

Donnerstag, 30. März 2006, 15:00–15:15, SCH 251

Structures and elastic properties for 2-d model colloidal crystals in confined geometry — •Andrea Ricci — Institut fuer Physik, J Gutenberg Universitaet Mainz

A model for colloidal particles confined between two parallel boundaries separated a distance D is simulated by Monte Carlo, for the two-dimensional (2-d) case at densities where the bulk 2-d is well in crystalline phase. While the positional order is enhanced for a suitably corrugated boundary potential, for a planar boundary potential, positional ordering normal to the walls is enhanced (No-dqlayeringNo-dq) but destroyed parallel to the walls: the behavior of the system is more 1-d like. Due to the layering the orientational order is always present. It is also discussed how, for different T above the bulk melting point, the ordering induced by the walls decays towards the bulk values when we move to the inner part of the system.

If D does not fit the lattice parameter we observe, in both cases of walls considered, formation of misfits.