文献类型：期刊文献

英文题名：Concentration-dependent conformation transition of regenerated silk fibroin induced by graphene oxide nanosheets incorporation

作者：Sha, Jin[1];Chen, Xin[1];Ma, Liang[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：57

期号：22

起止页码：1506

外文期刊名：JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS

收录：;EI(收录号：20194607677634);WOS:【SCI-EXPANDED(收录号:WOS:000494556800001)】；

基金：The authors sincerely acknowledge the support of Fundamental Research Funds for National Natural Science Foundation of China (5150306, 551273065).

语种：英文

外文关键词：beta-sheet structure; composites; conformation transition; crystallization; Fourier self-deconvolution analysis; graphene oxide; microstructure; silk fibroin

摘要：Regenerated silk fibroin (RSF)/graphene oxide (GO) nanocomposite has been substantially investigated due to its significant multifunctional potential. Here, in combination of micromorphology, crystalline conformation, dynamic mechanical property characterization, and Fourier self-deconvolution (FSD) quantitative analysis, we investigated the RSF molecular chains conformation transition induced by GO nanosheet incorporation, and its influence on the structural and mechanical properties of solution casted RSF/GO composite films. The GO nanosheet promoted the silk fibroin molecular chains conformation transition from random coil to beta-sheet structure, and a correlation between beta-sheet structure fraction and GO concentration was revealed. The beta-sheet structure fraction increases further improved the dynamic mechanical property of composite films. Moreover, based on nucleation-dependent aggregation of silk fibroin molecular chains, a mechanism considering the competition effect between GO concentration and its total surface area was proposed to explain the observed concentration-dependent conformation transition phenomenon. The study improves our understanding on silk fibroin conformation transition process in RSF/GO composite and would provide a valuable reference for the rational design of bioinspired multifunctional materials with enhanced mechanical properties. (c) 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019