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首页> 外文期刊>Acta biomaterialia >Effects of humidity on the mechanical properties of gecko setae.
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Effects of humidity on the mechanical properties of gecko setae.

机译：湿度对壁虎科的机械性能的影响。

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摘要

We tested the hypothesis that an increase in relative humidity (RH) causes changes in the mechanical properties of the keratin of adhesive gecko foot hairs (setae). We measured the effect of RH on the tensile deformation properties, fracture, and dynamic mechanical response of single isolated tokay gecko setae and strips of the smooth lamellar epidermal layer. The mechanical properties of gecko setae were strongly affected by RH. The complex elastic modulus (measured at 5 Hz) of a single seta at 80% RH was 1.2 GPa, only 39% of the value when dry. An increase in RH reduced the stiffness and increased the strain to failure. The loss tangent increased significantly with humidity, suggesting that water absorption produces a transition to a more viscous type of deformation. The influence of RH on the properties of the smooth epidermal layer was comparable with that of isolated seta, with the exception of stress at rupture. These values were two to four times greater for the setae than for the smooth layer. The changes in mechanical properties of setal keratin were consistent with previously reported increases in contact forces, supporting the hypothesis that an increase in RH softens setal keratin, which increases adhesion and friction.
机译：我们测试了以下假设：相对湿度（RH）的增加会导致壁虎脚毛（刚毛）的角蛋白机械性能发生变化。我们测量了RH对单个孤立的Tokay壁虎刚毛和光滑的层状表皮层条的拉伸变形性能，断裂和动态力学响应的影响。壁虎刚毛的机械性能受到RH的强烈影响。在80％RH的条件下，一个刚度的复数弹性模量（在5 Hz下测量）为1.2 GPa，仅干燥时的弹性模量的39％。 RH的增加会降低刚度并增加破坏应变。损耗角正切值随湿度显着增加，表明吸水会导致过渡到更粘的变形类型。 RH对光滑表皮层特性的影响与孤立的刚毛相比相当，除了破裂时的应力。刚毛的这些值是光滑层的2到4倍。牙龈角蛋白力学性能的变化与先前报道的接触力增加相一致，支持以下假设：RH的增加会软化牙龈角蛋白，从而增加粘附力和摩擦力。

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