SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 53 ›› Issue (1): 73-82.DOI: 10.1016/j.cjche.2022.02.022

• Full Length Article • 上一篇    下一篇

A self-healing and conductive ionic hydrogel based on polysaccharides for flexible sensors

Yufei Wang, Zihao Chen, Rui Chen, Jie Wei   

  1. Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers, Beijing 100029, China;Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing 100029, China;College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • 收稿日期:2021-09-29 修回日期:2022-02-13 出版日期:2023-01-28 发布日期:2023-04-08
  • 通讯作者: Jie Wei,E-mail:weij@mail.buct.edu.cn
  • 基金资助:
    This work was granted financial support from National Natural Science Foundation of China (51873009) and Beijing Natural Science Foundation (2192042).

A self-healing and conductive ionic hydrogel based on polysaccharides for flexible sensors

Yufei Wang, Zihao Chen, Rui Chen, Jie Wei   

  1. Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers, Beijing 100029, China;Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing 100029, China;College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2021-09-29 Revised:2022-02-13 Online:2023-01-28 Published:2023-04-08
  • Contact: Jie Wei,E-mail:weij@mail.buct.edu.cn
  • Supported by:
    This work was granted financial support from National Natural Science Foundation of China (51873009) and Beijing Natural Science Foundation (2192042).

摘要: In this study, we proposed a self-healing conductive hydrogel based on polysaccharides and Li+ to serve as flexible sensors. At first, the oxidized sodium alginate (OSA) was obtained through the oxidation reaction of sodium alginate (SA). Then OSA, carboxymethyl chitosan (CMC), and agarose (AGO) were dissolved in LiCl solution, respectively. Finally, the hydrogel was obtained through heating, mixing, and cooling processes. Because of the Schiff base structure and hydrogen bonding, the hydrogel demonstrates good mechanical and self-healing properties. The presence of Li+ provides good conductivity for the hydrogel. In addition, we demonstrated the application of the hydrogel as the flexible sensors. It can perceive the process of pressing Morse code with the index finger as a pressure sensor and monitor sliding movement of the thumb as the strain sensor to browse the web with the mobile phone. Thus, the self-healing conductive hydrogel may have potential applications in flexible wearable sensors.

关键词: Hydrogel, Self-healing, Conductivity, Polysaccharide, Flexible sensor

Abstract: In this study, we proposed a self-healing conductive hydrogel based on polysaccharides and Li+ to serve as flexible sensors. At first, the oxidized sodium alginate (OSA) was obtained through the oxidation reaction of sodium alginate (SA). Then OSA, carboxymethyl chitosan (CMC), and agarose (AGO) were dissolved in LiCl solution, respectively. Finally, the hydrogel was obtained through heating, mixing, and cooling processes. Because of the Schiff base structure and hydrogen bonding, the hydrogel demonstrates good mechanical and self-healing properties. The presence of Li+ provides good conductivity for the hydrogel. In addition, we demonstrated the application of the hydrogel as the flexible sensors. It can perceive the process of pressing Morse code with the index finger as a pressure sensor and monitor sliding movement of the thumb as the strain sensor to browse the web with the mobile phone. Thus, the self-healing conductive hydrogel may have potential applications in flexible wearable sensors.

Key words: Hydrogel, Self-healing, Conductivity, Polysaccharide, Flexible sensor