Fig. 6: Temperature responsive structural color actuators based on CLCEs with dynamic covalent bonds. | Light: Science & Applications

Fig. 6: Temperature responsive structural color actuators based on CLCEs with dynamic covalent bonds.

From: Liquid crystal-based structural color actuators

Fig. 6

a Molecular structures of the monomers used to prepare the CLCEs (top). The allyl dithiol (3) gives the CLCE the capability of undergoing reversible AFT bond exchange reactions via the AFT exchange mechanism (bottom): a radical from the photoinitiator or a thiyl radical can induce a bond exchange. b Photographs of CLCE films programmed at 25 °C, strained to 100%, exposed with light at 320–390 nm with an intensity of 70 mW cm−2 for varying amounts of time (20, 60, 120, 600 s), measured at 25 °C and 120 °C. c Transmittance spectra of the CLCE film measured during the programming, cycling between red and blue shifts. Reproduced with permission67. Copyright 2020, Wiley-VCH. d Molecular structures of the monomers used to prepare the CLCEs (left) and schematic mechanism (right) of B-O bond exchanging in the boronic ester: i) thermo-activated B-O bond exchange; ii) water-assisted B-O bond exchange. e Demonstration of reprogrammable and thermo-actuation properties in a single CLCE film (scale bars = 5 mm). Reproduced with permission69. Copyright 2022, Wiley-VCH

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