Journal
CARBOHYDRATE POLYMERS
Volume 250, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117010
Keywords
Cellulose nanofibrils; Hydrogel; Tannic acid; Strain responsiveness; Sensor
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Funding
- Key Laboratory of Horticultural Plant Genetic and Improvement of Jiangxi Province [2020KFJJ001]
- Young Elite Scientists Sponsorship Program by Tianjin [TJSQNTJ-2017-19]
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences [KF201912]
- [AWS18J004]
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The development of biomass-based hydrogel conductive devices is a promising but challenging subject. Here, cellulose was used to develop a strong, tough, and self-adhesive conductive hydrogel by constructing a synergistic covalent cross-link network and multiple physical interactions. Tannic acid-coated cellulose nanofibrils (TA@CNFs), poly(acrylamide), and ferric ions (Fe3+) were introduced in a composite network by coordination and hydrogen bonds. The strategy of interpenetrating network endowed this hydrogel with high mechanical strength (storage modulus over 14 K Pa), and strong toughness and tensile strength (fracture stress up to 108 K Pa). Chelated Fe3+ by metal coordination as inorganic conductive phase leads to good electrical conductivity (conductivity up to 3.12 S m(-1)). The obtained hydrogel also exhibited fine flexibility, extensive self-adhesion, and adjustable strain responsiveness for monitoring human joint movements. This work provided a new approach to design conductive hydrogels, and also can expand the application of cellulose-reinforced materials in the sensor field.
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