Jia Shengzhe, Yang Bingbing, Du Jing, Zhang Jiayin, Xie Yujiang, Yu Liuyang, Zhang Yuan, Tao Tiantian, Tang Weiwei, Gong Junbo
State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
Department of Chemistry, Institute of Molecular Aggregation Science, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, 300072, China.
Small Methods. 2024 Dec;8(12):e2400447. doi: 10.1002/smtd.202400447. Epub 2024 Aug 8.
Various fascinating optical characteristics in organisms encourage scientists to develop biomimetic synthesis strategies and mimic their unique microstructure. Inspired by the Chameleon's skin with tunable color and superior flexibility, this work designs the evaporated-induced self-assembly technique to synthesize the chiral photonic crystal film. Ultrasonic-intensified and additive-assisted techniques synergistically optimize the film properties, on the aspects of optic and mechanic. The film shows considerable rigidity and superior flexibility, which can undergo multiple mechanical deformations. Without destroying the chiral nematic structure, the ultimate strain approaches 50%, which exceeds most cellulose-derived film materials. It also integrates excellent optical performance. The film color can cover the total visible region by tuning the photonic bandgap and has angle-dependent properties. It can make the response to humidity and solvents, and chromaticity variation reflects the degree of stimulation. Importantly, this structural-dependent color change is reversible. Lastly, the photonic crystal materials with excellent mechanics and unique optics have been applied in the security. The anti-counterfeiting material design contains photonic crystal ink, repeatable writing paper, information-hiding film, and color-changing labels, with the features of environmentally friendly, economical, non-destructive, and convenient for authentication.
生物体中各种迷人的光学特性促使科学家们开发仿生合成策略并模仿其独特的微观结构。受具有可调节颜色和卓越柔韧性的变色龙皮肤启发，这项工作设计了蒸发诱导自组装技术来合成手性光子晶体薄膜。超声强化和添加剂辅助技术协同优化了薄膜在光学和力学方面的性能。该薄膜表现出相当的刚性和卓越的柔韧性，能够承受多次机械变形。在不破坏手性向列结构的情况下，极限应变接近50%，超过了大多数纤维素衍生的薄膜材料。它还具有出色的光学性能。通过调节光子带隙，薄膜颜色可以覆盖整个可见光区域，并且具有角度依赖性。它能够对湿度和溶剂做出响应，色度变化反映刺激程度。重要的是，这种结构依赖性颜色变化是可逆的。最后，具有优异力学性能和独特光学性能的光子晶体材料已应用于防伪领域。防伪材料设计包括光子晶体墨水、可重复书写纸、信息隐藏薄膜和变色标签，具有环保、经济、无损且便于认证的特点。
