Zhao Jin, Zhou Yichen, Zhang Xing, Zheng Ying, Liu Junfeng, Bao Yongzhong, Shan Guorong, Guo Hui, Yu Chengtao, Pan Pengju
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, China.
Institute of Zhejiang University-Quzhou, 99 Zheda Road, Quzhou, 324000, China.
Small. 2024 Aug;20(33):e2401261. doi: 10.1002/smll.202401261. Epub 2024 Mar 27.
Hydrogels have emerged as promising candidates for anticounterfeiting materials, owing to their unique stimulus-responsive capabilities. To improve the security of encrypted information, efforts are devoted to constructing transient anticounterfeiting hydrogels with a dynamic information display. However, current studies to design such hydrogel materials inevitably include sophisticated chemistry, complex preparation processes, and particular experimental setups. Herein, a facile strategy is proposed to realize the transient anticounterfeiting by constructing bivalent metal (M)-coordination complexes in poly(acrylic acid) gels, where the cloud temperature (T) of the gels can be feasibly tuned by M concentration. Therefore, the multi-T parts in the gel can be locally programmed by leveraging the spatially selective diffusion of M with different concentrations. With the increase of temperature or the addition of a complexing agent, the transparency of the multi-T parts in the gel spontaneously evolves in natural light, enabling the transient information anticounterfeiting process. This work has provided a new strategy and mechanism to fabricate advanced anticounterfeiting hydrogel materials.
由于具有独特的刺激响应能力，水凝胶已成为防伪材料的有前途的候选者。为了提高加密信息的安全性，人们致力于构建具有动态信息显示的瞬态防伪水凝胶。然而，目前设计此类水凝胶材料的研究不可避免地涉及复杂的化学过程、复杂的制备工艺和特殊的实验装置。在此，提出了一种简便的策略，通过在聚丙烯酸凝胶中构建二价金属（M）配位络合物来实现瞬态防伪，其中凝胶的浊点（T）可以通过M浓度进行可行的调节。因此，通过利用不同浓度的M的空间选择性扩散，可以对凝胶中的多个T部分进行局部编程。随着温度的升高或络合剂的加入，凝胶中多个T部分的透明度在自然光下自发演变，实现瞬态信息防伪过程。这项工作为制备先进的防伪水凝胶材料提供了一种新的策略和机制。
