期刊
ACS NANO
卷 12, 期 12, 页码 11860-11870出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b03943
关键词
NaOH/urea solution; low temperature; silk nanoribbons; single beta-sheet layer; hierarchical structure
类别
资金
- National Natural Science Foundation of China [21674018, 21304017]
- National Key Research and Development Program of China [2018YFC1105802/2018YFC1105800, 2016YFA0201702/2016YFA0201700]
- Shuguang Program - Shanghai Education Development Foundation
- Shanghai Municipal Education Commission [15SG30]
- Programme of Introducing Talents of Discipline to Universities [111-2-04]
- Polymer Program, Division of Materials Research, National Science Foundation in the U.S. [DMR-1808690]
In this study, nascent silk nanoribbons (SNRs) with an average thickness of 0.4 nm were extracted from natural silkworm silk by partially dissolving degummed silk (DS) in sodium hydroxide (NaOH)/urea solution at -12 degrees C. In this gentle treatment, the solvent could not destroy the nanofibrillar structure completely, but the chosen conditions would influence the dimensions of resulting SNRs. Molecular dynamics simulations of silk models indicated that the potential of mean force required to break hydrogen bonds between silk fibroin chains was 40% larger than that of van der Waals interactions between beta-sheet layers, allowing the exfoliating treatment. It was found that the resulting SNRs contained a single beta-sheet layer and amorphous silk fibroin molecules, which could be considered as the basic building block of DS consisting of hierarchical structures. The demonstrated technique for extracting ultrathin SNRs having the height of a single beta-sheet layer may provide a useful pathway for creating stronger and tougher silk-based materials and/or adding functionality and durability in materials for various applications. The hierarchical structure model based on SNRs may afford more insight into the structure and property relationship of fabricating silk-based materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据