Biomimetic Actuator Based on the Evasion Behavior of Pillbugs in Liquid Crystal Elastomers

Abstract

Liquid crystal elastomers (LCEs) are emerging smart materials, widely utilized due to their unique deformability and ease of manufacturing. LCEs, in their native state, lack intrinsic deformation control capabilities, relying on external stimuli to alter their forms, thereby allowing them to propel or manipulate objects. Taking inspiration from the behavioral patterns observed in pillbugs, our objective is to develop a biomimetic device capable of autonomously regulating its deformation, thereby enhancing the innate adaptability of LCEs. In this research, we have conceived an innovative intelligent biomimetic device by integrating cholesteric liquid crystal elastomers (CLCEs) and nematic liquid crystal elastomers (NLCEs). This device can exhibit negative phototaxis behavior when exposed to continuous illumination at specific wavelengths. It mirrors an emergency response akin to negative phototaxis observed in certain biological organisms. Upon the detection of intense light, the device exhibits alertness by altering its shape and swiftly relocates from the illuminated area, ceasing its motion once it reaches a safe location.