Bacterial nanocellulose assembly into super-strong and humidity-responsive macrofibers  

作　　者：Yadong Zhao Zheng Yang Rusen Zhou Bin Zheng Meiling Chen Fei Liu Wenhua Miao Renwu Zhou Patrick Cullen Zhenhai Xia Liming Dai Kostya(Ken)Ostrikov 

机构地区：[1]School of Food and Pharmacy,Zhejiang Ocean University,Zhoushan 316022,China [2]State Key Laboratory of Electrical Insulation and Power Equipment,Center for Plasma Biomedicine,Xi'an Jiaotong University,Xi'an 710049,China [3]School of Chemical and Biomolecular Engineering,University of Sydney,Sydney 2006,Australia [4]School of Chemistry and Physics and Centre for Materials Science,Queensland University of Technology,Brisbane 4000,Australia [5]Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [6]Australian Carbon Materials Centre(A-CMC),School of Chemical Engineering,University of New South Wales,Sydney,New South Wales 2052,Australia

出　　处：《Journal of Bioresources and Bioproducts》2024年第3期369-378,共10页生物质资源与工程（英文）

基　　金：support from the Zhejiang Provincial Natural Science Foundation of China(No.LR23C160001);the National Key Research and Development Program of China(No.2021YFD2100504).

摘　　要：Cellulose macrofibers (MFs) are gaining increasing interest as natural and biodegradable alternatives to fossil-derived polymers for both structural and functional applications. However, simultaneously achieving their exceptional mechanical performance and desired functionality is challenging and requires complex processing. Here, we reported a one-step approach using a tension-assisted twisting (TAT) technique for MF fabrication from bacterial cellulose (BC). The TAT stretches and aligns BC nanofibers pre-arranged in hydrogel tubes to form MFs with compactly assembled structures and enhanced hydrogen bonding among neighboring nanofibers. The as-prepared BC MFs exhibited a very high tensile strength of 1 057 MPa and exceptional lifting capacity (over 340 000 when normalized by their own weight). Moreover, due to the volume expansion of BC nanofibers upon water exposure, BC MFs quickly harvested energy from environmental moisture to untwist the bundled networks, thus generating a torsional spinning with a peak rotation speed of 884 r/(min·m). The demonstrated rapid and intense actuation response makes the MFs ideal candidates for diverse humidity-response-based applications beyond advanced actuators, remote rain indicators, intelligent switches, and smart curtains.

关 键 词：Nanocellulose assembly Cellulose macrofibers Super-strong Humidity-responsive actuation Moisture Fast actuation 

分 类 号：TB383[一般工业技术—材料科学与工程]