Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2609.doi: 10.7503/cjcu20210191

• Polymer Chemistry • Previous Articles     Next Articles

Protein-based Hydrogel Assisted by Hofmeister Effect for Strain Sensor

CAI Yaqian, ZHANG Jiahuai, LIU Fangzhe, LI Haichao, SHI Jianping, GUAN Shuang()   

  1. Polymeric and Soft Materials Laboratory,Advanced Institute of Materials Science,School of Chemistry and Life Science Changchun University of Technology,Changchun 130021,China
  • Received:2021-03-19 Online:2021-08-10 Published:2021-08-05
  • Contact: GUAN Shuang E-mail:guanshuang@ccut.edu.cn
  • Supported by:
    the Scientific Research Project of Education Department of Jilin Province, China(JJKH20210714KJ)

Abstract:

Natural protein-based hydrogels have been widely studied in recent years because of their good biocompatibility. However, the preparation of natural protein-based hydrogels with excellent toughness and electrical conductivity remains a challenging problem. Using sodium caseinate and gelatin as raw materials, a kind of natural protein-based hydrogel was prepared through Hofmeister effect by soaking in ammonium sulfate solution. The soaking method overcomed the weakness of soft and fragile protein-based hydrogel. The test results showed that the hydrogel had excellent mechanical properties. The maximum tensile stress of hydrogel was 3.55 MPa, and the maximum tensile strain was 1375 %. The maximum conductivity of the hydrogel was 0.0954 S/cm, and the conductivity sensitivity factor was 0.53. The hydrogel sensor had distinguishing ability for different strains, and can monitor the movement of different parts of human body. The hyderogel sensor showed accuracy and stability in the signal transmission process, which makes the hydrogel an ideal material for monitoring human health and movement. In addition, the hydrogel showed good shape-memory performance. This strategy opens up a new field of vision for the preparation of strong conductive hydrogels, and expands the application prospect of hydrogels in biomedical and electronic sensing fields.

Key words: Hydrogel, Gelatin, Sodium casein, Hofmeister effect, Strain sensor

CLC Number: 

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