Bacterial nanocellulose assembly into super-strong and humidity-responsive macrofibers
作者机构：School of Food and PharmacyZhejiang Ocean UniversityZhoushan 316022China State Key Laboratory of Electrical Insulation and Power EquipmentCenter for Plasma BiomedicineXi'an Jiaotong UniversityXi'an 710049China School of Chemical and Biomolecular EngineeringUniversity of SydneySydney 2006Australia School of Chemistry and Physics and Centre for Materials ScienceQueensland University of TechnologyBrisbane 4000Australia Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang ProvinceNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Australian Carbon Materials Centre(A-CMC)School of Chemical EngineeringUniversity of New South WalesSydneyNew South Wales 2052Australia
出 版 物：《Journal of Bioresources and Bioproducts》 (生物质资源与工程（英文）)
年 卷 期：2024年第9卷第3期
页 面：369-378页
核心收录：
学科分类：07[理学] 0817[工学-化学工程与技术] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
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)
主 题：Nanocellulose assembly Cellulose macrofibers Super-strong Humidity-responsive actuation Moisture Fast actuation
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.
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