Gao Huai-Ling, Zhao Ran, Cui Chen, Zhu Yin-Bo, Chen Si-Ming, Pan Zhao, Meng Yu-Feng, Wen Shao-Meng, Liu Chuang, Wu Heng-An, Yu Shu-Hong
Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei 230027, China.
Natl Sci Rev. 2020 Jan;7(1):73-83. doi: 10.1093/nsr/nwz077. Epub 2019 Jun 21.
Bio-sourced nanocellulosic materials are promising candidates for spinning high-performance sustainable macrofibers for advanced applications. Various strategies have been pursued to gain nanocellulose-based macrofibers with improved strength. However, nearly all of them have been achieved at the expense of their elongation and toughness. Inspired by the widely existed hierarchical helical and nanocomposite structural features in biosynthesized fibers exhibiting exceptional combinations of strength and toughness, we report a design strategy to make nanocellulose-based macrofibers with similar characteristics. By combining a facile wet-spinning process with a subsequent multiple wet-twisting procedure, we successfully obtain biomimetic hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers, realizing impressive improvement in their tensile strength, elongation and toughness simultaneously. The achievement certifies the validity of the bioinspired hierarchical helical and nanocomposite structural design proposed here. This bioinspired design strategy provides a potential platform for further optimizing or creating many more strong and tough nanocomposite fiber materials for diverse applications.
生物源纳米纤维素材料是用于纺制高性能可持续宏观纤维以用于先进应用的有前途的候选材料。人们已经采用了各种策略来获得强度更高的基于纳米纤维素的宏观纤维。然而，几乎所有这些都是以牺牲其伸长率和韧性为代价实现的。受生物合成纤维中广泛存在的具有优异强度和韧性组合的分级螺旋和纳米复合结构特征的启发，我们报告了一种设计策略，以制造具有类似特征的基于纳米纤维素的宏观纤维。通过将简便的湿纺工艺与随后的多次湿捻步骤相结合，我们成功地获得了基于细菌纤维素纳米纤维的仿生分级螺旋纳米复合宏观纤维，同时实现了其拉伸强度、伸长率和韧性的显著提高。这一成果证明了本文提出的仿生分级螺旋和纳米复合结构设计的有效性。这种仿生设计策略为进一步优化或创造更多用于各种应用的强韧纳米复合纤维材料提供了一个潜在平台。
