Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 15: Pattern Formation
DY 15.3: Talk
Tuesday, April 2, 2019, 10:30–10:45, H3
Effects of time-periodic forcing in a generalized Cahn-Hilliard model for the Langmuir-Blodgett transfer — •Phong-Minh Timmy Ly1, Uwe Thiele1, Lifeng Chi2, and Svetlana V. Gurevich1 — 1Westfälische Wilhelms-Universität, 48149 Münster, Germany — 2Soochow University, 215123 Suzhou, P.R. China
The Langmuir-Blodgett transfer is a surfactant based dip-coating technique where pattern formation occurs via self-organization. In particular, a solid substrate is pulled out of a liquid bath, covered by a monolayer of surfactants. In this setup the transfer velocity is the main control parameter and leads to deposition of different kinds of patterns depending on its magnitude. The procedure excels in through-put in comparison to traditional lithographic methods as means for pattern creation but lacks in terms of uniformity and ways to control the patterns. Therefore, we investigate the effect of a time-periodically modulated velocity on the pattern formation by means of a generalized Cahn-Hilliard equation. 1D and 2D direct numerical simulations reveal various synchronization phenomena as well as the deposition of a variety of complex patterns. Interestingly, it is also possible to influence the system in the spatial direction which is transversal to the direction of the forcing which can lead to the formation of synchronized patterns in two-spatial dimensions.