Liquid crystal elastomers that expand or contract on exposure to light can be used to drive a macroscopic motor
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References
Yamada, M. et al. Photomobile polymer materials: towards light-driven plastic motors. Angew. Chem. Int. Ed. 47, 4986–4988 (2008)
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Armstrong, G. Illuminating elastomers. Nature Chem (2008). https://doi.org/10.1038/nchem.29
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DOI: https://doi.org/10.1038/nchem.29