Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster Tuesday: Nanostructures

O 41.1: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Bridging states vs. simple droplets on prepatterned substrates: a free energy analysis — •Leon Topp and Andreas Heuer — Westfälische Wilhelms-Universität, Institut für Physika-lische Chemie, 48149 Münster, Germany

Since the wetting properties of surfaces play a huge role in many technical applications, a lot of effort has been spent on the investigation of the behavior of droplets on homogenous as well as on heterogeneous surfaces. A simple model for a heterogeneous structure is a substrate which contains alternating lyophobic and lyophilic stripes. To better understand the behaviour of droplets on such surfaces we performed Monte Carlo simulations of systems with two lyophilic stripes, separated by a lyophobic one, and analyse the configurations with Markov State Modelling and Umbrella sampling to calculate free energy profiles. We determined different topological states where a drop is e.g. either placed on one of the lyophillic stripes or forms a bridge between these stripes. The weight of both configurations strongly depends on the stripe width and their mutual distance. With the resulting free energy profiles we gained phase diagrams and derived parameter regimes were a transition between the states is easily possible.