Kilogram-scale production of strong and smart cellulosic fibers featuring unidirectional fibril alignment  

作　　者：Jianguo Li Chaoji Chen Qiongyu Chen Zhihan Li Shaoliang Xiao Jinlong Gao Shuaiming He Zhiwei Lin Hu Tang Teng Li Liangbing Hu 

机构地区：[1]Department of Materials Science and Engineering,University of Maryland,College Park,MD 20742,USA [2]Department of Mechanical Engineering,University of Maryland,College Park,MD 20742,USA

出　　处：《National Science Review》2024年第10期28-35,共8页国家科学评论（英文版）

基　　金：supported by the University of Maryland A.James Clark School of Engineering,and the US National Science Foun-dation(1936452).

摘　　要：Multifunctional fibers with high mechanical strength enable advanced applications of smart textiles,robotics,and biomedicine.Herein,we reported a one-step degumming method to fabricate strong,stiff,and humidity-responsive smart cellulosic fibers from abundant natural grass.The facile process involves partially removing lignin and hemicellulose functioning as glue in grass,which leads to the separation of vessels,parenchymal cells,and cellulosic fibers,where cellulosic fibers are manufactured at kilogram scale.The resulting fibers show dense and unidirectional fibril structure at both micro-and nano-scales,which demonstrate high tensile strength of∼0.9 GPa and Young’s modulus of 72 GPa,being 13-and 14-times higher than original grass.Inspired by stretchable plant tendrils,we developed a humidity-responsive actuator by engineering cellulosic fibers into the spring-like structures,presenting superior response rate and lifting capability.These strong and smart cellulosic fibers can be manufactured at large scale with low cost,representing promising a fiber material derived from renewable and sustainable biomass.

关 键 词：cellulosic fiber uniaxial fibril biomass actuator smart fiber 

分 类 号：TQ34[化学工程—化纤工业]