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Analysis of the Contribution of Conformation and Fibrils on Tensile Toughness and Fracture Resistance of Camel Hairs
ACS Biomaterials Science & Engineering ( IF 5.4 ) Pub Date : 2020-12-24 , DOI: 10.1021/acsbiomaterials.0c00892 Wenwen Zhang 1, 2 , Jing Ren 2 , Ying Pei 3 , Chao Ye 2 , Yimin Fan 1 , Zeming Qi 4 , Shengjie Ling 2
ACS Biomaterials Science & Engineering ( IF 5.4 ) Pub Date : 2020-12-24 , DOI: 10.1021/acsbiomaterials.0c00892 Wenwen Zhang 1, 2 , Jing Ren 2 , Ying Pei 3 , Chao Ye 2 , Yimin Fan 1 , Zeming Qi 4 , Shengjie Ling 2
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Animal hairs, like other natural fibers, display excellent mechanical properties, especially, the tensile toughness and fracture resistance. Several structure-mechanics models have attributed mechanical superiority of hair to its unique nanocomposite structure which consists of intermediate filaments and matrix. However, the contribution of fibrils and their associated interfaces on the mechanical properties of animal hairs remains unclear. Herein, using the small- and wide-angle X-ray scattering, and an ultrahigh-speed microcamera system, it is confirmed that the conformation and fibrils (which represent both nanofibrils and microfibrils) of the keratin channel endow tensile toughness and fracture resistance to camel hairs. During the stretching process, an α–β transition occurred at the secondary structure level, leading to the formation of a tensile plateau, which improves the toughness compared with the structure without a conformation transition. Meanwhile, fibrils further toughened the camel hairs and resisted their crack propagation through confined fibrillar slippage, splitting, and pulling. These structure–property relations in natural hairs can inspire damage-tolerant polymer fiber design.
中文翻译：
骆驼毛的构象和原纤维对拉伸韧性和抗断裂性能的贡献分析
动物毛发与其他天然纤维一样，具有优异的机械性能，特别是拉伸韧性和断裂强度。一些结构力学模型将头发的机械优越性归因于其独特的纳米复合结构，该结构由中间丝和基质组成。然而，原纤维及其相关界面对动物毛发机械性能的贡献仍不清楚。在此，利用小角度和广角X射线散射以及超高速显微相机系统，证实了角蛋白通道的构象和原纤维（代表纳米原纤维和微原纤维）赋予了拉伸韧性和断裂抗性骆驼毛。在拉伸过程中，二级结构水平发生α-β转变，导致拉伸平台的形成，与没有构象转变的结构相比，这提高了韧性。同时，原纤维进一步增强了骆驼毛的韧性，并通过有限的原纤维滑动、分裂和拉扯来阻止裂纹扩展。天然毛发中的这些结构-性能关系可以激发耐损伤聚合物纤维的设计。
更新日期：2020-12-24
中文翻译：
骆驼毛的构象和原纤维对拉伸韧性和抗断裂性能的贡献分析
动物毛发与其他天然纤维一样，具有优异的机械性能，特别是拉伸韧性和断裂强度。一些结构力学模型将头发的机械优越性归因于其独特的纳米复合结构，该结构由中间丝和基质组成。然而，原纤维及其相关界面对动物毛发机械性能的贡献仍不清楚。在此，利用小角度和广角X射线散射以及超高速显微相机系统，证实了角蛋白通道的构象和原纤维（代表纳米原纤维和微原纤维）赋予了拉伸韧性和断裂抗性骆驼毛。在拉伸过程中，二级结构水平发生α-β转变，导致拉伸平台的形成，与没有构象转变的结构相比，这提高了韧性。同时，原纤维进一步增强了骆驼毛的韧性，并通过有限的原纤维滑动、分裂和拉扯来阻止裂纹扩展。天然毛发中的这些结构-性能关系可以激发耐损伤聚合物纤维的设计。
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