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High‐Power Actuation from Molecular Photoswitches in Enantiomerically Paired Soft Springs
Author(s) -
Aßhoff Sarah J.,
Lancia Federico,
Iamsaard Supitchaya,
Matt Benjamin,
Kudernac Tibor,
Fletcher Stephen P.,
Katsonis Nathalie
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201611325
Subject(s) - photoisomerization , nanotechnology , photoswitch , materials science , molecular switch , mechanism (biology) , isomerization , chemistry , physics , molecule , catalysis , photochemistry , quantum mechanics , biochemistry , organic chemistry
Motion in plants often relies on dynamic helical systems as seen in coiling tendrils, spasmoneme springs, and the opening of chiral seedpods. Developing nanotechnology that would allow molecular‐level phenomena to drive such movements in artificial systems remains a scientific challenge. Herein, we describe a soft device that uses nanoscale information to mimic seedpod opening. The system exploits a fundamental mechanism of stimuli‐responsive deformation in plants, namely that inflexible elements with specific orientations are integrated into a stimuli‐responsive matrix. The device is operated by isomerization of a light‐responsive molecular switch that drives the twisting of strips of liquid‐crystal elastomers. The strips twist in opposite directions and work against each other until the pod pops open from stress. This mechanism allows the photoisomerization of molecular switches to stimulate rapid shape changes at the macroscale and thus to maximize actuation power.