Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 6: Poster Session I

DY 6.50: Poster

Montag, 22. März 2010, 16:00–18:00, Poster B2

Scaling behaviour in a minimal model for block copolymer microdomain ordering — •Christian Riesch and Robert Magerle — Chemische Physik, TU Chemnitz, D-09107 Chemnitz

We simulate microphase separation and subsequent microdomain ordering processes in lamellae- and cylinder-forming block copolymers using a coarse-grained model, based on a modified Cahn-Hilliard equation. This model has often been studied by use of cell dynamics simulations. We compare the ordering of stripes in 2D simulations with the ordering of cylinders in thin films (3D simulations). Evolution of microdomain order is tracked by four different quantities. Orientational correlation length and average curvature represent global measures of order. Densities of characteristic defects, such as dislocations and disclinations, provide insight into the mechanisms promoting growth of long-range microdomain order. We discuss the influence of noise and film thickness on power laws observed in measures of order and compare different numerical techniques in terms of accuracy and efficiency.