Highly Flexible and Broad-Range Mechanically Tunable All-Wood Hydrogels with Nanoscale Channels via the Hofmeister Effect for Human Motion Monitoring

• 作者: Guihua Yan Shuaiming He Gaofeng Chen Sen Ma Anqi Zeng Binglin Chen Shuliang Yang Xing Tang Yong Sun Feng Xu Lu Lin Xianhai Zeng
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2022,（5）
• 页码范围: 255-268
• 页数: 14页
• 语种: 英文

摘要

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.