Wood-based hydrogel with a unique aniso-tropic structure is an attractive soft material,but the pres-ence of rigid crystalline cellulose in natural wood makes the hydrogel less flexible.In this study,an all-wood hydrogel was constructed by cross-linking cellulose fibers,polyvi-nyl alcohol(PVA)chains,and lignin molecules through the Hofmeister effect.The all-wood hydrogel shows a high tensile strength of 36.5 MPa and a strain up to～438％in the longitu-dinal direction,which is much higher than its tensile strength(～2.6 MPa)and strain(～198％)in the radial direction,respec-tively.The high mechanical strength of all-wood hydrogels is mainly attributed to the strong hydrogen bonding,physi-cal entanglement,and van der Waals forces between lignin molecules,cellulose nanofibers,and PVA chains.Thanks to its excellent flexibility,good conductivity,and sensitivity,the all-wood hydrogel can accurately distinguish diverse macroscale or subtle human movements,including finger flexion,pulse,and swallowing behavior.In particular,when"An Qi"was called four times within 15 s,two varia-tions of the pronunciation could be identified.With recyclable,biodegradable,and adjustable mechanical properties,the all-wood hydrogel is a multifunctional soft material with promising applications,such as human motion monitoring,tissue engineering,and robotics materials.

Guihua Yan;Shuaiming He;Gaofeng Chen;Sen Ma;Anqi Zeng;Binglin Chen;Shuliang Yang;Xing Tang;Yong Sun;Feng Xu;Lu Lin;Xianhai Zeng

College of Energy,Xiamen University,Xiamen 361102,People's Republic of China;State Key Laboratory of Pulp and Paper-Making Engineering,South China University of Technology,Guangzhou 510640,People's Republic of China;Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,No.35,Tsinghua East Road,Haidian,Beijing 100083,People's Republic of China

纳微快报（英文）

[1]Guihua Yan;Shuaiming He;Gaofeng Chen;Sen Ma;Anqi Zeng;Binglin Chen;Shuliang Yang;Xing Tang;Yong Sun;Feng Xu;Lu Lin;Xianhai Zeng-.Highly Flexible and Broad-Range Mechanically Tunable All-Wood Hydrogels with Nanoscale Channels via the Hofmeister Effect for Human Motion Monitoring)[J].纳微快报（英文）,2022(05):255-268

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