Xue Rui, Zhao Hui, An Ze-Wei, Wu Wei, Jiang Yan, Li Peng, Huang Chong-Xing, Shi Dean, Li Robert K Y, Hu Guo-Hua, Wang Shuang-Fei
School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning, Guangxi 530004, China.
ACS Nano. 2023 Mar 28;17(6):5653-5662. doi: 10.1021/acsnano.2c11809. Epub 2023 Mar 10.
Cellulose nanocrystal (CNC)-based chiral nematic structure is widely used in stimulus response and sensing. A popular area of research is enhancing the mechanical characteristics and environmental adaptability of chiral nematic materials. In this paper, a flexible photonic film with self-healing ability (FPFS) was prepared by combining waterborne polyurethane containing dynamic covalent disulfide bonds (SSWPU) with CNC. The results found that the FPFS showed excellent toughness under the action of stretching, bending, twisting, and folding. The FPFS exhibited an amazing self-healing efficiency, which can be self-healed within 2 h at room temperature. Moreover, the FPFS could respond immediately and produce reversible color change when it was soaked in typical solvents. In addition, when ethanol was used as ink to paint on the FPFS, a visible pattern only under polarized light was formed. This study offers fresh perspectives in the areas of self-healing, biological anticounterfeiting, solvent response, and flexible photonic materials.
基于纤维素纳米晶体（CNC）的手性向列相结构被广泛应用于刺激响应和传感领域。一个热门的研究领域是提高手性向列相材料的机械性能和环境适应性。在本文中，通过将含有动态共价二硫键的水性聚氨酯（SSWPU）与CNC相结合，制备了一种具有自愈能力的柔性光子薄膜（FPFS）。结果发现，FPFS在拉伸、弯曲、扭转和折叠作用下表现出优异的韧性。FPFS表现出惊人的自愈效率，在室温下2小时内即可自愈。此外，当FPFS浸泡在典型溶剂中时，它能够立即响应并产生可逆的颜色变化。此外，当使用乙醇作为墨水在FPFS上进行绘画时，仅在偏振光下形成可见图案。本研究在自愈、生物防伪、溶剂响应和柔性光子材料等领域提供了新的视角。
