Photocontrollable Liquid Crystalline Soft Actuators via Upconversion Luminescence

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  By incorporating azobenzene groups into the crosslinked liquid crystal polymers (CLCPs),large deformations such as contraction and bending have been induced by light due to the photoisomerization of the azobenzene chromophores.1-4 Since light is an ideal stimulus for it can be localized (in time and space),selective,and allows for remote delivery of energy,photodeformable CLCPs present an interesting opportunity to realize soft actuators in microscope applications,such as full-light-driven motor,oscillators,and microrobots.5-8 However,most of the photocontrollable CLCP systems were controlled by ultraviolet light which is not idea for practical application,due to considerations of safety,power consumption and cost.Therefore,it would be interesting and significant to develop photodeformable CLCPs which could be photo-regulated by a low energy light,because it is more environment-friendly and causes less damage.
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