Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms12033
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Funding
- Key Science Technology Innovation Team of Zhejiang Province [2013TD02]
- National Natural Science Foundation of China [21104067, 21274127, 21374099, 51473144]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- Research Grants Council of Hong Kong [16305015, 16301614, N_HKUST 604/14]
- Innovation and Technology Commission [ITC-CNERC14SC01]
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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.
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