甲壳素
水溶液
尿素
化学
分子间力
质子核磁共振
差示扫描量热法
高分子化学
超分子化学
结晶学
水动力半径
动态光散射
化学工程
聚合物
分子
回转半径
材料科学
有机化学
纳米技术
壳聚糖
热力学
纳米颗粒
工程类
物理
胶束
作者
Yan Fang,Bo Duan,Ang Lu,Maili Liu,Huili Liu,Xiaojuan Xu,Lina Zhang
出处
期刊:Biomacromolecules
[American Chemical Society]
日期:2015-03-05
卷期号:16 (4): 1410-1417
被引量:164
标识
DOI:10.1021/acs.biomac.5b00195
摘要
The intra- and intermolecular interactions of chitin in NaOH/urea aqueous system were studied by a combination of NMR measurements (including 13C NMR, 23Na NMR, and 15N NMR) and differential scanning calorimetry. The results revealed that the NaOH and chitin formed a hydrogen-bonded complex that was surrounded by the urea hydrates to form a sheath-like structure, leading to the good dissolution. The optimal concentration range, in which chitin was molecularly dispersed in NaOH/urea aqueous, was found to investigate the chain conformation in the dilute solution with a combination of static and dynamic light scattering. The weight-average molecular weight (Mw), radii of gyration (⟨Rg⟩z), and hydrodynamic radii (⟨Rh⟩z) values of chitin were determined, and the structure-sensitive parameter (ρ) and persistent length (Lp) were calculated to be >2.0 and ∼30 nm, respectively, suggesting an extended wormlike chain conformation. The visualized images from TEM, cryo-TEM, and AFM indicated that, chitin nanofibers were fabricated from the parallel aggregation of chitin chains in NaOH/urea system. This work would provide a theoretical guidance for constructing novel chitin-based nanomaterials via “bottom-up” method at the molecular level.
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