Zhang Jiaxin, Lu Mengxia, Cai Xin, Müller-Buschbaum Peter, Zhong Qi
Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 928 Second Avenue, 310018 Hangzhou, China.
Key Laboratory of Silk Culture Heritage and Products Design Digital Technology, Ministry of Culture and Tourism, School of Fashion Design and Engineering, Zhejiang Sci-Tech University, 310018 Hangzhou, China.
ACS Appl Mater Interfaces. 2025 Feb 5;17(5):8445-8455. doi: 10.1021/acsami.5c00250. Epub 2025 Jan 27.
A wearable detector to monitor visible light intensity is realized by the restrained photochromism of a hydrogel composite containing light-responsive spiropyran with hydroxyl groups (SPOH). When exposed to visible light, the SPOH experiences a ring-opening to a ring-closed transition accompanied by discoloration from red to yellow. Unlike in the solution, the photochromism/discoloration rate is strongly correlated to the cross-linking points. By reducing the amount of cross-linker from 40 to 5 mg, the photochromism rate of SPOH is 300% faster. Inspired by the Chinese Jade Loong from Hongshan, the hydrogel composite is shaped into a Loong to monitor the light intensity. By increasing the amount of cross-linker in the head, body, and tail, the photochromism/discoloration rate sequentially turns slower from one region to the other. Higher light intensity is required to realize the discoloration in the hydrogel composite containing a larger amount of the cross-linker. Because the initial colors are identical, the light intensity can be easily traced by checking the discoloration of these pieces containing different amounts of cross-linker. Based on this unique and reversible photochromic capability, the present hydrogel composite can be used for monitoring the visible light intensity to prevent myopia, especially for children and students.
一种用于监测可见光强度的可穿戴探测器是通过含有带羟基的光响应性螺吡喃（SPOH）的水凝胶复合材料的受限光致变色来实现的。当暴露于可见光时，SPOH经历从开环到闭环的转变，同时伴随着颜色从红色变为黄色。与在溶液中不同，光致变色/褪色速率与交联点密切相关。通过将交联剂的量从40毫克减少到5毫克，SPOH的光致变色速率加快了300%。受红山文化中华龙的启发，水凝胶复合材料被制成龙的形状以监测光强度。通过增加头部、身体和尾部的交联剂含量，光致变色/褪色速率从一个区域到另一个区域依次变慢。在含有较多交联剂的水凝胶复合材料中需要更高的光强度才能实现变色。由于初始颜色相同，通过检查这些含有不同交联剂含量的部件的变色情况，可以很容易地追踪光强度。基于这种独特的可逆光致变色能力，目前的水凝胶复合材料可用于监测可见光强度以预防近视，特别是对于儿童和学生。
