可逆分子形变促进蜘蛛拖丝在循环扭转中的无规响应
Fatigueless response of spider draglines in cyclic torsion facilitated by reversible molecular deformation
摘要：
我们证明，蜘蛛拉铲表现出疲劳响应在极端循环扭转到其断裂极限。在$1095$和$1245 cm^{-1}$处的良好定义的拉曼带随着顺时针和逆时针方向上的扭曲的增加而线性地向较低的波数移动。在数千个连续加载循环的扭转应变接近其断裂极限，所有的拉曼光谱带被保存和特征拉曼峰位移被发现是可逆的。此外，纳米级表面轮廓的加工丝绸出现一样好的原始丝绸。这种独特的无疲劳扭转反应的拉铲，促进蛋白质分子的可逆变形，可以找到持久的微型设备中的应用。
英文摘要：
We demonstrate that spider draglines exhibit a fatigueless response in extreme cyclic torsion up to its breaking limit. The well defined Raman bands at $1095$ and $1245 cm^{-1}$ shifted linearly towards lower wavenumbers versus increasing twist in both clockwise and counter-clockwise directions. Under thousands of continuous loading cycles of twist strain approaching its breaking limit, all the Raman bands were preserved and the characteristic Raman peak shifts were found to be reversible. Besides, nanoscale surface profile of the worked silk appeared as good as the pristine silk. This unique fatigueless twist response of draglines, facilitated by reversible deformation of protein molecules, could find applications in durable miniatured devices.
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