Structure changes in Nephila dragline: The influence of pressure
Structure changes in Nephila dragline: The influence of pressure
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Nephila 拉铲的结构变化：压力的影响
DOI：
10.1016/j.polymer.2012.09.045
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发表时间：
2012
期刊：
影响因子：
4.6
通讯作者：
F. Kremer
中科院分区：
文献类型：
--
作者：
R. Ene;C. Krywka;Shin;P. Papadopoulos;M. Burghammer;E. D. Cola;M. Müller;F. Kremer
利用压力依赖广角X射线散射（WAXS）技术研究了（受阻）超收缩状态下的大壶腹蜘蛛丝的非晶相和纳米晶相之间的相互作用。通过将之前发表的宏观弹性模量与纳米晶体模量进行比较，可以量化纳米晶体和非晶相对机械性能的贡献。从检测到的位移的衍射峰的纳米晶体的压缩模量推导和证明是最高的（100）-方向的片内氢键。这反映了纳米晶体内堆叠的β-片层氢键的分子结构。此外，发现压力可以增加非晶相的组织，增强靠近（210）反射峰的衍射环。在超收缩状态下更明显，因为内部应力被释放，结构可以重新排列。
Pressure dependent Wide Angle X-ray Scattering (WAXS) is employed to analyse the interplay between the amorphous and the nanocrystalline phases of major ampullate spider silk from Nephila edulis in the (hindered) supercontracted state. By comparing the previously published macroscopic elastic modulus with the nanocrystal modulus it is possible to quantify the contribution of the nanocrystals and the amorphous phase to the mechanical properties. From the detected shifts of the diffraction peaks the compression modulus of the nanocrystals is deduced and proven to be highest in the (100)-direction of intra-sheet hydrogen bonds. This reflects the molecular architecture of the stacked β-sheeted H-bonds within the nanocrystals. In addition, it is found that pressure may increase the organization of the amorphous phase, enhancing a diffraction ring close to the (210) reflection peak. It is more pronounced in the supercontracted state since the internal stress is released and the structure can rearrange.
影响因子：
64.8
作者：
Hagn, Franz;Eisoldt, Lukas;Kessler, Horst
通讯作者：
Kessler, Horst
影响因子：
15
作者：
Holland, Gregory P.;Creager, Melinda S.;Yarger, Jeffery L.
通讯作者：
Yarger, Jeffery L.