Gelation process visualized by aggregation-induced emission fluorogens

Zhengke Wang (), Jingyi Nie, Wei Qin, Qiaoling Hu () and Ben Zhong Tang ()
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Zhengke Wang: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University
Jingyi Nie: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University
Wei Qin: Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology
Qiaoling Hu: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University
Ben Zhong Tang: Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Alkaline-urea aqueous solvent system provides a novel and important approach for the utilization of polysaccharide. As one of the most important polysaccharide, chitosan can be well dissolved in this solvent system, and the resultant hydrogel material possesses unique and excellent properties. Thus the sound understanding of the gelation process is fundamentally important. However, current study of the gelation process is still limited due to the absence of direct observation and the lack of attention on the entire process. Here we show the entire gelation process of chitosan LiOH-urea aqueous system by aggregation-induced emission fluorescent imaging. Accompanied by other pseudo in situ investigations, we propose the mechanism of gelation process, focusing on the formation of junction points including hydrogen bonds and crystalline.

Date: 2016
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DOI: 10.1038/ncomms12033

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