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Abstract
Adhesive hydrogels have gained popularity in biomedical applications, however, traditional adhesive hydrogels often exhibit short-term adhesiveness, poor mechanical properties and lack of antibacterial ability. Here, a plant-inspired adhesive hydrogel has been developed based on Ag-Lignin nanoparticles (NPs)triggered dynamic redox catechol chemistry. Ag-Lignin NPs construct the dynamic catechol redox system, which creates long-lasting reductive-oxidative environment inner hydrogel networks. This redox system, generating catechol groups continuously, endows the hydrogel with long-term and repeatable adhesiveness. Furthermore, Ag-Lignin NPs generate free radicals and trigger self-gelation of the hydrogel under ambient environment. This hydrogel presents high toughness for the existence of covalent and non-covalent interaction in the hydrogel networks. The hydrogel also possesses good cell affinity and high antibacterial activity due to the catechol groups and bactericidal ability of Ag-Lignin NPs. This study proposes a strategy to design tough and adhesive hydrogels based on dynamic plant catechol chemistry.
Biomimetic catechol-based adhesives have attracted significant interest but can lose adhesion due to excessive oxidation. Here, the authors report on the addition of silver-Lignin nanoparticles as a dynamic catechol redox system to maintain catechol/quinone balance, making a reusable, antibacterial bioadhesive.
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1 Southwest Jiaotong University, Key Lab of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Chengdu, China (GRID:grid.263901.f) (ISNI:0000 0004 1791 7667)
2 Xihua University, Key Laboratory of Fluid and Power Machinery of Ministry of Education, School of Materials Science and Engineering, Chengdu, China (GRID:grid.412983.5) (ISNI:0000 0000 9427 7895)
3 Southern University of Science and Technology, Shenzhen, Department of Materials Science and Engineering, Guangdong, China (GRID:grid.412983.5)
4 South China University of Technology, Department of Polymer Science and Engineering, School of Materials Science and Engineering, Guangzhou, China (GRID:grid.79703.3a) (ISNI:0000 0004 1764 3838)
5 Sichuan University, National Engineering Research Center for Biomaterials, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581)