Design of superior spider silk: From nanostructure to mechanical properties
Design of superior spider silk: From nanostructure to mechanical properties
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DOI：
10.1529/biophysj.106.089144
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发表时间：
2006-12-01
影响因子：
3.4
通讯作者：
Li, Daiqin
中科院分区：
文献类型：
--
作者：
Du, Ning;Liu, Xiang Yang;Li, Daiqin
蜘蛛拖丝因其优异的机械性能而具有实用价值。然而，这种材料的结构在很大程度上仍然是未知的。在本文中，我们报告了我们认为是基于扫描电子显微镜和原子力显微镜图像的丝的层次结构的新模型。这种分层结构包括-片、多肽链网络和丝原纤维。结果表明，通过减小多肽链网络中结晶节点的大小，同时增加结晶节点的取向程度，可以获得异常高的蜘蛛拖丝强度。在此基础上，可以更好地理解缫丝速度对蜘蛛拖丝力学性能的影响。希望在这项研究中获得的理解将有助于揭示蜘蛛丝的形成，从而有助于设计超强丝的原理。
Spider dragline silk is of practical interest because of its excellent mechanical properties. However, the structure of this material is still largely unknown. In this article, we report what we believe is a new model of the hierarchical structure of silk based on scanning electron microscope and atomic force microscope images. This hierarchical structure includes beta-sheet, polypeptide chain network, and silk fibril. It turns out that an exceptionally high strength of the spider dragline silk can be obtained by decreasing the size of the crystalline nodes in the polypeptide chain network while increasing the degree of orientation of the crystalline nodes. Based on this understanding, how the reeling speed affects mechanical properties of spider dragline silk can be understood properly. Hopefully, the understanding obtained in this study will shed light on the formation of spider silk, and consequently, on the principles for the design of ultrastrong silk.