Regensburg 2019 – wissenschaftliches Programm
CPP 25.45: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Light-induced deformation of azo-polymer droplets - challenges in modelling the influence of light — •Markus Koch1, Marina Saphiannikova1, Svetlana Santer2, and Olga Guskova1 — 1Institute Theory of Polymers, IPF Dresden, Germany — 2Institute of Physics and Astronomy, University of Potsdam, Germany
In recent years azobenzene-containing materials have been gaining a lof of scientific interest due to the possibility to change their properties by using light as an external stimulus . These effects are based on the trans-cis photoisomerization of azobenzene and its interplay with the surrounding system. To gain a deeper understanding of the deformation of azo-materials we study an azo-polymer droplet on a silica surface exposed to UV-vis light. Here, the azo side groups of the polymer chains reorient perpendicular to the E-field of light due to cyclic photoisomerization . Using MD simulations we study the influence of linearly polarized light on the droplet applying two different approaches. In the first case we simulate the repeated angle-dependent trans-cis photoizomerization of azobenzenes explicitly by temporally changing the torsion angle around the azo bond . In the second case we utilize an effective orientation potential , which reorients the azobenzenes without modelling the photoisomerization events.
We gratefully acknowledge support from German Research Foundation (DFG), projects GU 1510/3-1 and SA 1657/13-1.
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