1. Bio-inspired layered chitosan/graphene oxide nanocomposite hydrogels with high strength and pH-driven shape memory effect.
- Author
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Zhang, Yaqian, Zhang, Min, Jiang, Haoyang, Shi, Jinli, Li, Feibo, Xia, Yanhong, Zhang, Gongzheng, and Li, Huanjun
- Subjects
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GRAPHENE oxide , *CHITOSAN , *HYDROGELS , *SHAPE memory effect , *NANOCOMPOSITE materials , *MOLECULAR self-assembly - Abstract
The layered nanocomposite hydrogel films containing chitosan (CS) and graphene oxide (GO) have been prepared by water evaporation induced self-assembly and subsequent physical cross-linking in alkaline solution. The layered CS/GO hydrogel films obtained have a nacre-like brick-and-mortar microstructure, which contributes to their excellent mechanical properties. The tensile strength and elongation at break of the hydrogel films with 5 wt% GO are 5.35 MPa and 193.5%, respectively, which are comparable to natural costal cartilage. Furthermore, the CS/GO hydrogel films exhibited pH-driven shape memory effect, and this unique phenomenon is mainly attributed to the reversible transition of partial physically cross-linking corresponding to hydrogen bondings and hydrophobic interactions between CS polymer chains due to pH changing. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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