Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster Session II

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 Guskova11Institute 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 [1]. 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 [2]. 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 [3]. In the second case we utilize an effective orientation potential [2], 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.

[1] Yadavalli, N.S. et al. Appl. Phys. Lett. 105, 051601 (2014)

[2] Toshchevikov, V. et al. J. Phys. Chem. B, 113(15), 5032 (2009)

[3] Heinz, H. et al. Chem. Mater. 20, 6444 (2008)

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