文献类型：期刊文献

英文题名：A green MXene-based organohydrogel with tunable mechanics and freezing tolerance for wearable strain sensors

作者：Liu, Shuo[1];Tian, Xinyu[1];Zhang, Xiansheng[1,2,3];Xu, Chongzhi[1];Wang, Lili[1];Xia, Yanzhi[1]

机构：[1]Qingdao Univ, Coll Text & Clothing, Collaborat Innovat Ctr Marine Biomass Fibers Mat, Inst Marine Biobased Mat,State Key Lab Biofibers, Qingdao 266071, Peoples R China;[2]Shaoxing Univ, Key Lab Clean Dyeing & Finishing Technol Zhejiang, Shaoxing 312000, Peoples R China;[3]Qingdao Univ, Res Ctr Intelligent & Wearable Technol, Intelligent Wearable Engn Res Ctr Qingdao, Qingdao 266071, Peoples R China

年份：2022

卷号：33

期号：4

起止页码：2205

外文期刊名：CHINESE CHEMICAL LETTERS

收录：SCI-EXPANDED(收录号：WOS:000789375500093)、、Scopus(收录号：2-s2.0-85119517010)、WOS

基金：The current work was financially supported by the National Natural Science Foundation of China (Nos. 51803101 and 52003131 ), Natural Science Foundation of Shandong Province (Nos. ZR2019BEM005 and ZR2019BEM026 ), China Postdoctoral Science Foundation (No. 2021T140352 ), State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University, Nos. ZKT14 , ZKT32 , GZRC202016 , ZFZ201805 ), Project of Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province (No. QJRZ1904 ), Program for Changjiang Scholars and Innovative Research Team in University (No. IRT_ 14R30 ) and Taishan Scholar Program of Shandong Province (No. tspd20181208 ).

语种：英文

外文关键词：Organohydrogel; Mechanical performance; Temperature tolerance; Strain sensor; MXene

外文摘要：Conductive hydrogels have attracted considerable attention owing to their potential for use as electronic skin and sensors. However, the loss of the inherent elasticity or conductivity in cold environments severely limits their working conditions. Generally, organic solvents or inorganic salts can be incorporated into hydrogels as cryoprotectants. However, their toxicity and/or corrosive nature as well as the significant water loss during the solvent exchange present serious difficulties. Herein, a liquid-like yet non-toxic polymer-polyethylene glycol (PEG) was attempted as one of the components of solvent for hydrogels. In the premixed PEG-water hybrid solvent, polyacrylamide (PAAm) was in situ polymerized, overcoming the inevitable water loss induced by the high osmotic pressure of the PEG solution and achieving tailored water capacity. Interestingly, the mechanical strength ("soft-to-rigid" transition) and anti-freezing properties of organohydrogels can be simultaneously tuned over a very wide range through adjusting PEG content. This was due to that with increasing PEG in solvent, the PAAm chains transformed from stretching to curling conformation, while PEG bonded with water molecules via hydrogen bonds, weakening the crystallization of water at subzero temperature. Additionally, a highly conductive Ti3C2Tx-MXene was further introduced into the organohydrogels, achieving a uniform distribution triggered by the attractive interaction between the rich functional groups of the nanofillers and the polymer chains. The nanocomposite hydrogels demonstrate high electrical conductivity and strain sensitivity, along with a wide working temperature window. Such a material can be used for monitoring human joint movement even at low temperature and has potential applications in wearable strain sensors. (c) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.