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NIR-UV Responsive Actuator with Graphene Oxide/Microchannel-Induced Liquid Crystal Bilayer Structure for Biomimetic Devices.

Soft bilayer actuators with simple fabrication process, diverse molecular alignment, and multi-stimulus response are displayed in this work. The microchannel method proposed by us can exquisitely program the molecular arrangement. Based on the mismatch in coefficient of thermal expansion (CTE) between graphene oxide (GO) and azobenzene doped liquid crystal network (ALCN), bilayer actuators can exhibit reversible, rapid, and complex deformations under the control of heat, UV and NIR light. Furthermore, various deformation behaviors of bilayer actuators can also be achieved by directionally arranging GO layers in addition to microchannels. Smart bilayer membranes can be customized into a range of delicate biomimetic devices, such as bionic butterfly, bionic leaf and foot robot, promising their numerous applications in biomimetic and intelligent soft robotics fields.