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首页> 外文期刊>Advanced Functional Materials >How Water Can Affect Keratin: Hydration-Driven Recovery of Bighorn Sheep (Ovis Canadensis) Horns
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How Water Can Affect Keratin: Hydration-Driven Recovery of Bighorn Sheep (Ovis Canadensis) Horns

机译：水如何影响角蛋白：水合驱动的大角羊（Ovis Canadensis）角的恢复

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摘要

Keratin is one of the most common structural biopolymers exhibiting high strength, toughness, and low density. It is found in various tissues such as hairs, feathers, horns, and hooves with various functionalities. For instance, horn keratin absorbs a large amount of energy during intraspecific fights. Keratinized tissues are permanent tissues because of their basic composition consisting of dead keratinized cells that are not able to remodel or regrow once broken or damaged. The lack of a self-healing mechanism presents a problem for horns, as they are under continued high risk from mechanical damage. In the present work, it is shown for the first time that a combination of material architecture and a water-assisted recovery mechanism, in the horn of bighorn sheep, endows them with shape and mechanical property recoverability after being subjected to severe compressive loading. Moreover, the effect of hydration is unraveled, on the material molecular structure and mechanical behavior, by means of synchrotron wide angle X-ray diffraction, Fourier transform infrared spectroscopy, nanoindentation, and in situ and ex situ tensile tests. The recovery and remodeling mechanism is anisotropic and quite distinct to the self-healing of living tissue such as bones.
机译：角蛋白是表现出高强度，韧性和低密度的最常见的结构生物聚合物之一。它存在于各种组织中，例如具有各种功能的头发，羽毛，角和蹄。例如，角内角蛋白在种内斗争中吸收了大量能量。角化组织是永久性组织，因为它们的基本组成是由死亡的角化细胞组成，一旦破裂或损坏，它们就无法重塑或再生。缺乏自愈机制会给喇叭带来问题，因为喇叭一直遭受机械损坏的高风险。在本工作中，首次显示了在大角羊的角上，材料结构和水辅助恢复机制的结合，使它们在承受严重的压缩载荷后具有形状和机械性能的恢复性。此外，借助于同步加速器广角X射线衍射，傅立叶变换红外光谱，纳米压痕以及原位和异位拉伸试验，还没有了解水合对材料分子结构和力学行为的影响。恢复和重塑机制是各向异性的，并且与诸如骨骼等活组织的自我修复完全不同。

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  • 来源
    《Advanced Functional Materials》 |2019年第27期|1901077.1-1901077.10|共10页
  • 作者

    Huang Wei; Zaheri Alireza; Yang Wen; Kisailus David; Ritchie Robert O.; Espinosa Horacio; McKittrick Joanna;

  • 作者单位

    Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA;

    Northwestern Univ, Theoret & Appl Mech Program, Evanston, IL 60201 USA;

    Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92093 USA;

    Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA;

    Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA;

    Northwestern Univ, Theoret & Appl Mech Program, Evanston, IL 60201 USA|Northwestern Univ, Dept Mech Engn, Evanston, IL 60208 USA;

    Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA|Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    energy absorption; keratin; mechanical behavior; self-recovery; water effects;

    机译：能量吸收角蛋白力学行为自恢复水效应;

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