Wei Xiaoyao, Lin Tao, Wang Le, Lin Jiacheng, Yin Xuefeng
College of Bioresources Chemical and Materials Engineering, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, PR China.
College of Bioresources Chemical and Materials Engineering, Key Laboratory of Paper Based Functional Materials of China National Light Industry, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, PR China.
Int J Biol Macromol. 2023 Apr 30;235:123805. doi: 10.1016/j.ijbiomac.2023.123805. Epub 2023 Mar 1.
Photonic crystal materials based on cellulose nanocrystals (CNC), which are environmentally responsive and green, have attracted widespread attention. To overcome the brittleness of CNC films, many researchers have explored functional additives to improve their performance. In this study, a new green deep eutectic solvents (DESs) and an amino acid-based natural deep eutectic solvents (NADESs) were introduced into CNC suspensions for the first time, and hydroxyl-rich small molecules (glycerol, sorbitol) and polymers (polyvinyl alcohol, polyethylene glycol) were coassembled with the DESs and NADESs to form three-component composite films. The CNC/G/NADESs-Arg three-component film reversibly changed color from blue to crimson as the relative humidity rose from 35 % to 100 %; additionally, the elongation at break increased to 3.05 %, and the Young's modulus decreased to 4.52 GPa. The hydrogen bond network structure provided by trace amounts of the DESs or NADESs not only improved the mechanical properties of the composite films but also increased their water absorption capacities without destroying their optical activities. This allows for the development of more stable CNC films and creates potential for biological applications in the future.
基于纤维素纳米晶体（CNC）的光子晶体材料具有环境响应性且绿色环保，已引起广泛关注。为克服CNC薄膜的脆性，许多研究人员探索了功能性添加剂以改善其性能。在本研究中，首次将新型绿色低共熔溶剂（DESs）和基于氨基酸的天然低共熔溶剂（NADESs）引入CNC悬浮液中，富含羟基的小分子（甘油、山梨醇）和聚合物（聚乙烯醇、聚乙二醇）与DESs和NADESs共组装形成三组分复合薄膜。随着相对湿度从35%升至100%，CNC/G/NADESs-Arg三组分薄膜颜色从蓝色可逆地变为深红色；此外，断裂伸长率增加至3.05%，杨氏模量降至4.52 GPa。痕量DESs或NADESs提供的氢键网络结构不仅改善了复合薄膜的机械性能，还提高了其吸水能力，同时不破坏其光学活性。这有助于开发更稳定的CNC薄膜，并为未来的生物应用创造潜力。
