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DY: Fachverband Dynamik und Statistische Physik

DY 58: Poster - Fluids

DY 58.12: Poster

Donnerstag, 19. März 2015, 16:00–18:00, Poster A

A Theoretical Investigation of Patterned Depositions from Thin Films of Evaporating Solutions — •Walter Tewes, Svetlana Gurevich, and Uwe Thiele — Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9 48149 Münster, Germany

We aim at a theoretical description of patterned deposition of solute from an evaporating thin film of solution on a substrate.

For this purpose we formulate a system of coupled partial differential equations for thin solution layers, describing phase separation within the solution as well as dewetting and evaporation of the solvent.

The deposition process is investigated in the case of a contact line of the solution film which recedes due to pulling of the substrate (dip-coating) and/or evaporation.

The deposition patterns obtained by direct numerical simulations comprise stripes and patterns of hexagonal type. Central control parameters defining the properties of the occurring patterns are the velocity of the receding contact line and the initial concentration of the solution.