Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 13, Pages 15632-15640Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c00680
Keywords
liquid crystal networks; graphene oxide; photothermal effect; light-powered self-oscillator; coupled oscillating mode
Funding
- National Key R&D Program of China [2018YFB0703702]
- National Natural Science Foundation of China [52173066, 51921002, 92156011]
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This study reports a graphene oxide/liquid crystalline network actuator that exhibits unique oscillation behavior when activated by light. The actuator demonstrates amplitude and frequency superposition, and shows different behaviors depending on the cutting direction.
Light-activated self-oscillators have drawn enormous attention for their potential applications in mobile machines, energy harvesting, signal modulation, etc. Herein, we report one graphene oxide (GO)/liquid crystalline network (LCN) actuator that presents a unique light-activated oscillation with amplitude and frequency superposition. The GO/LCN composite film is prepared by the one-step polymerization of LC monomers, which favors a splay orientation in LC cells made by gluing together two glass sheets, one coated with photothermal agent GO and the other coated with a rubbed polyimide alignment layer. Owing to the asymmetric contraction/expansion, changing the cutting direction gives rise to notably different actuation behaviors for GO/LCN composite films. Moreover, it twists a little during the deflection process as a result of experimental error during the cutting process, which may cause the strip to be cut inaccurately. When the composite film is embedded in a self-shadowing system, it produces an unconventional hybrid oscillation mode upon near-infrared light irradiation, i.e., bending and twisting oscillation coupled. Furthermore, when the aspect ratio of the film decreases, the twisting mode is suppressed and the actuator changes from a coupled mode to a single bending mode. The proposed strategy may extend the application of GO/LCN composite materials and enrich light-activated self-oscillating behaviors.
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