Thermochromic Multicolored Photonic Coatings with Light Polarization- and Structural Color-Dependent Changes

Abstract

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Molecular Engineering for Chiroptical Smart Paints: Photo‐Tunable and Polymerizable Helical Nanostructures by Cyanostilbene‐Based Reactive Mesogens

“…There are electro-, photo-, thermo-, humidity-, and mechano-responsive CLCs for optical functions and communications. [7][8][9][10][11][12][13][14][15][16] Among them, many researches related to photoresponsive CLCs are specialized in reversible and remote controllable optical changes, chiral inversion, and temporary photopatterning. [17][18][19][20][21] However, in some cases, the reversible and temporary helical pitch changes found in conventional CLC materials obstruct the photoresponsive functional CLC system to expand for practical applications.…”

Programming Thermochromic Liquid Crystal Hetero-Oligomers for Near-Infrared Reflectors: Unequal Incorporation of Similar Reactive Mesogens in Thiol-ene Oligomers

“…A variety of cholesteric liquid crystal oligomers based on siloxanes 5,18 and thiol-ene click chemistry 30,31 have been synthesized to date. Owing to the large library of commercially available diacrylate liquid crystal monomers, oligomers with tunable functional and responsive properties can be designed.…”

“…Of particular interest are stimuli-responsive photonic materials. These materials change their color based on specific stimuli such as light, − temperature, − and chemicals − and may find applications in optical sensors, anti-counterfeiting labels, or heat-regulating window films.…”

“…The promotion of the smectic phase induces a more gradual phase transition from the smectic to cholesteric phase, tightening the helical twist over a wide temperature range and inducing a gradual blueshift of the reflected wavelength upon heating without affecting the visible region. A variety of cholesteric liquid crystal oligomers based on siloxanes , and thiol-ene click chemistry , have been synthesized to date. Owing to the large library of commercially available diacrylate liquid crystal monomers, oligomers with tunable functional and responsive properties can be designed. ,− Making use of a hetero-oligomer allows for an additional degree of tunability and control over the phase behavior that is unavailable when only one liquid crystal monomer is used.…”

Controlling the Phase Behavior and Reflection of Main-Chain Cholesteric Oligomers Using a Smectic Monomer

“…A temperature-responsive photonic coating based on cholesteric oligosiloxane liquid crystal with a 3 wt% cross-linked liquid crystal network only showed a 220 nm reflection band shift between 61 °C and 22 °C [ 26 ]. This shows that in many cases the mobility of the mesogens is largely lost by full or partial cross-linking of the materials, causing the suppression or loss of the pre-transitional effect [ 9 , 10 , 44 ]. It remains a challenge to properly control this effect in a polymeric temperature-responsive photonic system.…”