Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster Session III

CPP 50.52: Poster

Tuesday, March 17, 2020, 14:00–16:00, P1C

Properties of droplets on (prestructured) switchable surfaces — •Leon Topp and Andreas Heuer — Westfälische Wilhelms-Universität, Institut für Physikalische Chemie, 48149 Münster, Germany

It is possible to switch the wettability of surfaces which consist for example of azobenzenes by external stimuli like light of a defined wavelength. When a droplet is placed on such a substrate and it is switched this leads to a relaxation of the droplet to the new surface properties and as a consequence to a change of the contact angle and shape.

To investigate this process theoretically we performed Molecular Dynamic Simulations of droplets placed on a fcc lattice consisting of Lennard-Jones particles. By changing the interaction strength between the liquid particles and the surface we can control the wetting properties and have the possibility to switch them. Thus, we considered different switching frequencies and study how the contact angle and the shape of the droplet evolves. Also we prestructured the surface and examine the influence of switching on droplets placed on such substrates.