甲虫的表皮原子力显微镜的识别：Bouligand结构和纳米纤维各向异性弹性。,Advanced Functional Materials

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甲虫的表皮原子力显微镜的识别：Bouligand结构和纳米纤维各向异性弹性。
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-12-27 , DOI: 10.1002/adfm.201603993
Ruiguo Yang ₁ , Alireza Zaheri _{1,

2} , Wei Gao _{1,

2} , Cheryl Hayashi ₃ , Horacio D. Espinosa _{1,

2}

Affiliation

天然材料中常见的结构之一是螺旋结构（Bouligand），其中纤维层围绕螺旋螺钉扭曲。尽管有许多研究表明存在Bouligand结构，但用于纳米级结构表征和纤维力学性能鉴定的方法仍有待开发。在这项研究中，我们使用Cotinis mutabilis（甲壳虫中的甲虫）的表皮作为模型材料，开发了一种新的实验理论方法，该方法结合了基于原子力显微镜的纳米压痕和各向异性接触力学分析。使用这种方法，我们研究了螺旋结构及其组成纤维的机械性能。发现层间的扭曲角在12°–18°范围内，螺旋图案的节距为220 nm。另外，测得的组成纤维直径为约20nm，这与在其他节肢动物种类的螺旋体中发现的纤维直径一致。纳米纤维的纵向，横向和剪切模量分别确定为710 MPa，70 MPa和90 MPa。既定的实验理论方法有望成为纳米级表征生物材料中螺旋结构和其他结构的有用工具。纳米纤维的剪切模量和剪切模量分别确定为710MPa，70MPa和90MPa。既定的实验理论方法有望成为纳米级表征生物材料中螺旋结构和其他结构的有用工具。纳米纤维的剪切模量和剪切模量分别确定为710MPa，70MPa和90MPa。既定的实验理论方法有望成为纳米级表征生物材料中螺旋结构和其他结构的有用工具。

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AFM Identification of Beetle Exocuticle: Bouligand Structure and Nanofiber Anisotropic Elastic Properties

One of the common architectures in natural materials is the helicoidal (Bouligand) structure, where fiber layers twist around a helical screw. Despite the many studies that have shown the existence of Bouligand structures, methods for nanoscale structural characterization and identification of fiber mechanical properties remain to be developed. In this study, we used the exocuticle of Cotinis mutabilis (a beetle in the Cetoniinae) as a model material to develop a new experimental‐theoretical methodology that combines atomic force microscopy‐based nanoindentation and anisotropic contact mechanics analysis. Using such methodology, we studied both the helicoidal structure and the mechanical properties of its constituent fibers. The twist angle between the layers was found to be in the range of 12°–18° with a pitch size of 220 nm for the helicoidal pattern. In addition, the constituent fiber diameter was measured to be approximately 20 nm, which is consistent with the fiber diameters found in helicoids of other arthropod species. The longitudinal, transverse, and shear modulus of the nanofiber were determined to be 710 MPa, 70 MPa, and 90 MPa, respectively. The established experimental‐theoretical methodology promises to be a useful tool for nanoscale characterization of helicoidal and other structures found in biological materials.

更新日期：2016-12-27

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