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Updated: Jul 5, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Boosting the photo-switchability of double-responsive water-soluble polymers by incorporating arylazopyrazole dyes
René Steinbrecher1, Peiran Zhang2, Christine M Papadakis2
1Institute of Chemistry, University of Potsdam, Potsdam-Golm, Germany. laschews@uni-potsdam.de.
Abstract:
Dual thermo- and light-responsive water-soluble copolymers that respond to exclusively non-invasive triggers are obtained by functionalising poly(N,N-dimethylacrylamide) with arylazopyrazole side chains. The light-induced E-Z (trans-Z) photo isomerisation of these dyes provides an exceptionally effective photo-switch, which can reversibly shift the LCST-type phase transition temperatures by almost 25 K.
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