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MOLECULAR CRYSTALS AND LIQUID CRYSTALS · 2023 · IF 0.7

Preparation of the colorful retroreflective film based on the polymer-stabilized cholesteric liquid crystal

Yajie Yang,Jinghua Zhao,Wei Liu,Yi Li,Yonggang Yang

A cholesteric liquid crystal (CLC) mixture was prepared using a photoisomerizable chiral dopant and acrylates. With extending the irradiation time of a 365-nm UV light, the Bragg reflection band of the CLC mixture shifted to long wavelength. After photopolymerization, a polymer-stabilized CLC (PSCLC) film was obtained. The colorful PSCLC patterns with glass microspheres on the surface were prepared by controlling the competition between the photoisomerization of the chiral dopant and the photopolymerization of the acrylates. Due to the retroreflective property, the patterned PSCLC films can be applied as the traffic signs and for advertisement.

CAS / MDL: 71868-10-5

研究领域: 材料科学 · 光学

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Advanced Optical Materials · 2020 ·Vol. 8 ·期 23 ·2001367 · IF 8.286

Retroreflection and Wettability Controlled Smart Indicator Based on Responsive Bilayer Photonic Crystals for Traffic Warning

Yong Qi,Changtong Zhou,Wenbin Niu,Shufen Zhang,Suli Wu,Wei Ma,Bingtao Tang

Due to the increasing human mortality caused by natural disasters and traffic accidents, the development of smart traffic warning systems is urgent. The first smart indicator for traffic warning based on bilayer photonic crystals with both selective retroreflection and response reflection optical properties is developed. The wettability-controlled reflection evaluates the risk of landslides and warns drivers to slow down, while the retroreflection simultaneously displays iridescent vivid structural colors to observers at different viewing directions relative to the illumination direction and informs drivers the approaching of the accident blackspot. The mechanism involves diffractions in the periodic nanostructures and uses the wettability of vertical surfaces to realize the spectral diversity of reflectance. Moreover, colorful flickering structural colors based on the rotational periodic diffraction and angle dependence of the retroreflection are designed for speed limits warning. It demonstrates an energy-efficient, smart, and tunable multi-functionalized bilayer photonic crystal that is especially suitable for nighttime traffic warning, advertisement, and periodic warning display applications.

研究领域: 材料科学 · 光学工程 · 智能交通系统

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PROGRESS IN ORGANIC COATINGS · 2017 · IF 2.858

Fabrication of retro-reflective polyurethane via covalently embedding with amino-functionalized glass microspheres

Saiqi Tian,Peikun Zhang,Haojun Fan,Yi Chen,Jun Yan

Amino-functionalized glass microspheres (NH 2 -GM) grafted with 3-aminopropyltriethoxysilane (APTS) were synthesized and well characterized by X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and scanning electron microscope (SEM). Then the NH 2 -GM was covalently incorporated into polyurethane (PU) matrix through urea linkages to fabricate a composite with retro-reflective effect, and the influence of NH 2 -GM content on the retro-reflective performance, glass transition temperature, morphology structure and mechanical properties of the resultant glass microspheres based retro-reflective polyurethane (GMPU) were investigated. Results demonstrate that GMPU maintains initial retro-reflective properties and reflects bright light under vertical angle incidence in darkness. Moreover, compared with PU directly blending with GMs (GM/PU), GMPU shows clear improved compatibility and interfacial interactions between PU and NH 2 -GMs, as evidenced by the higher glass transition temperature and enhanced mechanical properties of GMPU hybrids.

CAS / MDL: 110-63-4 822-06-0 4098-71-9 109-83-1

研究领域: 材料科学 · 化学工程

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Preparation of the colorful retroreflective film based on the polymer-stabilized cholesteric liquid crystal

Retroreflection and Wettability Controlled Smart Indicator Based on Responsive Bilayer Photonic Crystals for Traffic Warning

Fabrication of retro-reflective polyurethane via covalently embedding with amino-functionalized glass microspheres