Han, Seung Hui Lim, Seok-In Ryu, Ki-Hyun Koo, Jahyeon Kang, Dong-Gue Jeong, Kwang-Un Jeon, Seung-Yeol Kim, Dae-Yoon 2024-01-19T10:31:43Z 2024-01-19T10:31:43Z 2022-12-01 2023-01 1616-301X https://pubs.kist.re.kr/handle/201004/114179 Examples of anisotropic movement paired with helical geometry abound in the animal and plant kingdoms are used for a variety of reasons, such as diverse social signaling directed at conspecifics or camouflage to avoid predation. Inspired by these natural phenomena, a smart sensor is developed with a chiroptical 3D actuator that can fold, bend, and twist in response to external stimuli, reflecting light of specific wavelengths, and possessing circular polarization properties. Chirophotonic crystal actuators are constructed with an asymmetric Janus structure and are fabricated by self-assembly, screen printing, and in situ photopolymerization. The optically active layer consists of cholesteric liquid crystal polymer, and the mechanically active layer is composed of a polymeric gel thin film. The programmed in-planar and out-of-planar asymmetric Janus structures control the directionality of various shapes morphing from 2D to 3D. Finite element simulations allow to predict the shape changes associated with these chirophotonic crystal actuators: flower blooming, tendril climbing, eagle hunting, ant lifting, and inchworm moving motions. By utilizing the chirophotonic crystal actuator, a reusable and portable methanol-laced water identifier is developed. English John Wiley & Sons Ltd. Chiroptical 3D Actuators for Smart Sensors Article 10.1002/adfm.202210680 1 Advanced Functional Materials, v.33, no.3 Advanced Functional Materials 33 3 N scie scopus 000882689800001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article CHAMELEON smart sensors soft actuators helical nanostructures heterogeneous assembly selective reflection