title: Lanthanide ions-induced formation of hierarchical and transparent polysaccharide hybrid films.
abstract: Nacre-like hybrid films based on N-succinyl chitosan (NSC), sodium alginate (SA) and lanthanide ions were fabricated via coordination interactions. In this work, the binary building blocks (NSC and SA) were self-assembled into aligned hydrogel films by coordination with lanthanide ions, and hierarchical NSC-SA hybrid films were obtained upon drying. Two species of lanthanide ions (Gd3+and Yb3+) were used to fabricate the hierarchical NSC-SA hybrid films. The as-prepared NSC-SA hybrid films exhibit high tensile strength and stability. The tensile strength and toughness of as-prepared hybrid films reach 122.10MPa and 3.89MJm-3, respectively. Meanwhile, the well-aligned lamellar microstructures also exhibit a good light transmittance. The highest light transmittance reaches 92% for NSC-SA hybrid films at 760nm. This fabrication method for hierarchical NSC-SA hybrid films is innovative due to the utilization of rare earth coordination bonding, and can serve as the basic strategy for the construction of high-performance composites in the near future.
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China.
authors.forename: Shunli
authors.initials: S
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China.
authors.forename: Kewen
authors.initials: K
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Yao
authors.affiliation: Institute for Clean Energy and Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China.
authors.forename: Liqun
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing, Jiangsu Province, 211189, China. Electronic address: 101010855@seu.edu.cn.
authors.forename: Guodong
authors.initials: G
authors.lastname: Fu
keywords: Hierarchical structure; Hybrid films; Lanthanide ions coordination; N-succinyl chitosan; Sodium alginate