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DY: Fachverband Dynamik und Statistische Physik

DY 16: Pattern Formation

DY 16.6: Talk

Wednesday, March 13, 2013, 11:15–11:30, H46

Pattern formation in Cahn-Hilliard models for Langmuir-Blodgett transfer — •Markus Wilczek, Svetlana V. Gurevich, and Rudolf Friedrich — Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Deutschland

Langmuir-Blodgett transfer is an established method for covering substrates with monolayer films. During the transfer, partial condensation of the monolayer can lead to the formation of patterns in different phases of the transferred monolayer. Experimental parameters like the transfer velocity influence the properties of the patterns, like the orientation and wavelength of stripes.

In this work, we investigate the pattern formation process in the framework of spinodal decomposition by means of Cahn-Hilliard models. Besides the transfer onto homogeneous substrates, the influence of prestructured substrates is studied. In particular, the occurrence of synchronization phenomena is described.

In addition, the transition between different orientations of stripe patterns is investigated, revealing the occurrence of secondary instabilities leading to certain patterns.