期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 16, 页码 5332-5337出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900470
关键词
dyes and pigments; liquid crystals; locomotion; soft actuators; polymers
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fonds de recherche du Quebec: Nature et technologies (FRQNT)
- FRQNT
- China Scholarship Council (CSC)
The ability to optically reconfigure an existing actuator of a liquid crystal polymer network (LCN) so that it can display a new actuation behavior or function is highly desired in developing materials for soft robotics applications. Demonstrated here is a powerful approach relying on selective polymer chain decrosslinking in a LCN actuator with uniaxial LC alignment. Using an anthracene-containing LCN, spatially controlled optical decrosslinking can be realized through photocleavage of anthracene dimers under 254 nm UV light, which alters the distribution of actuation (crosslinked) and non-actuation (decrosslinked) domains and thus determines the actuation behavior upon order-disorder phase transitions. Based on this mechanism, a single actuator having a flat shape can be reconfigured in an on-demand manner to exhibit reversible shape transformation such as self-folding into origami three-dimensional structures. Moreover, using a dye-doped LCN actuator, a light-fueled microwalker can be optically reconfigured to adopt different locomotion behaviors, changing from moving in the laser scanning direction to moving in the opposite direction.
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