Zhang Ze-Lian, Dong Xiu, Zhao Yu-Yao, Song Fei, Wang Xiu-Li, Wang Yu-Zhong
The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China.
Biomacromolecules. 2022 Oct 10;23(10):4110-4117. doi: 10.1021/acs.biomac.2c00491. Epub 2022 Sep 7.
Recent advances of photonic crystals are driven to mechanical sensors and smart wearable devices; however, for chiral photonic cellulose nanocrystal (CNC) materials, vivid structural coloration and reversible mechanochromism like chameleon skin remain a big challenge. Here, we report a ternary co-assembly and post-UV-irradiation polymerization strategy to develop flexible and elastic CNC composite films, which, notably, have naked-eye-visible brilliant structural colors and stretching-induced color change covering a broad wavelength region at a moderate deformation (like skin). By adjusting the stretching, the film is designed as a smart skin to adapt to surrounding environments for camouflage. This work offers a universal strategy for constructing biomimic optically functional cellulose skins.
光子晶体的最新进展被应用于机械传感器和智能可穿戴设备；然而，对于手性光子纤维素纳米晶体（CNC）材料而言，要实现类似变色龙皮肤那样鲜艳的结构色和可逆的机械变色仍然是一个巨大的挑战。在此，我们报道了一种三元共组装和紫外光后辐照聚合策略，以制备柔性且有弹性的CNC复合薄膜，值得注意的是，该薄膜具有肉眼可见的鲜艳结构色以及在适度变形（如皮肤）时覆盖宽波长区域的拉伸诱导颜色变化。通过调节拉伸程度，该薄膜被设计成一种智能皮肤，以适应周围环境进行伪装。这项工作为构建仿生光学功能纤维素皮肤提供了一种通用策略。
