自愈水凝胶
生物高聚物
水溶液中的金属离子
超分子化学
离子
软物质
氧化还原
自组装
化学
壳聚糖
高分子化学
材料科学
分子
金属
聚合物
化学工程
纳米技术
无机化学
胶体
有机化学
复合材料
工程类
作者
Zhifang Sun,Fucong Lv,Lujie Cao,Lin Liu,Yi Zhang,Zhouguang Lu
标识
DOI:10.1002/anie.201502228
摘要
A new type of multistimuli-responsive hydrogels cross-linked by metal ions and biopolymers is reported. By mixing the biopolymer chitosan (CS) with a variety of metal ions at the appropriate pH values, we obtained a series of transparent and stable hydrogels within a few seconds through supramolecular complexation. In particular, the CS-Ag hydrogel was chosen as the model and the gelation mechanism was revealed by various measurements. It was found that the facile association of Ag(+) ions with amino and hydroxy groups in CS chains promoted rapid gel-network formation. Interestingly, the CS-Ag hydrogel exhibits sharp phase transitions in response to multiple external stimuli, including pH value, chemical redox reactions, cations, anions, and neutral species. Furthermore, this soft matter showed a remarkable moldability to form shape-persistent, free-standing objects by a fast in situ gelation procedure.
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