Mechanical properties, microstructure and chemical composition of naked mole rat incisors

IF 1.3 4区工程技术 Q4 ENGINEERING, BIOMEDICAL Bioinspired Biomimetic and Nanobiomaterials Pub Date : 2021-12-22 DOI:21.00004

Hongyan Qi, Guixiong Gao, Huixin Wang, Yunhai Ma, Hubiao Wang, Siyang Wu, Jiangtao Yu, Qinghua Wang

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Abstract

The naked mole rat incisors (NMRI) exhibit excellent mechanical properties, which make it a good prototype for design and fabrication of bionic mechanical systems and materials. In this work, we characterised the chemical composition, microstructure and mechanical properties of NMRI, and further compared these properties with the laboratory rat incisors (LRI). We found out that (i) Enamel and dentin are composed of organic matter, inorganic matter and water. The ratio of Ca/P in NMRI enamel is higher than that of LRI enamel. (ii) The dentin has a porous structure. The enamel has a three-dimensional reticular structure, which is more complex, regular and denser than the lamellar structure of LRI enamel. (iii) Enamel has anisotropy. Its longitudinal nano-hardness is greater than that of transverse nano-hardness, and both of them are higher than that of LRI enamel. Their nano-hardness and elastic modulus increase with the increase in distance from enamel-dentin boundary. The nano-hardness of dentin is smaller than that of enamel. The chemical composition and microstructure are considered to be the reasons for the excellent properties of NMRI. The chemical composition and unique microstructure can provide inspiration and guide for the design of bionic machinery and materials.

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裸鼹鼠门牙的力学性能、微观结构及化学成分

裸鼹鼠门牙(NMRI)具有优异的力学性能，为仿生机械系统和仿生材料的设计和制造提供了良好的原型。在这项工作中，我们表征了NMRI的化学成分、微观结构和力学性能，并进一步将这些性能与实验室大鼠门牙(LRI)进行了比较。我们发现:(1)牙釉质和牙本质是由有机物、无机物和水组成的。NMRI牙釉质中Ca/P比值高于LRI牙釉质。(ii)牙本质具有多孔结构。牙釉质具有三维网状结构，比LRI牙釉质的片层结构更为复杂、规则、致密。(iii)牙釉质具有各向异性。其纵向纳米硬度大于横向纳米硬度，均高于LRI牙釉质。纳米硬度和弹性模量随离牙本质边界距离的增加而增大。牙本质的纳米硬度小于牙釉质的纳米硬度。化学成分和微观结构被认为是NMRI具有优异性能的原因。其化学成分和独特的微观结构可以为仿生机械和仿生材料的设计提供灵感和指导。

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来源期刊

Bioinspired Biomimetic and Nanobiomaterials ENGINEERING, BIOMEDICAL-MATERIALS SCIENCE, BIOMATERIALS

CiteScore

2.20

自引率

0.00%

发文量

期刊介绍： Bioinspired, biomimetic and nanobiomaterials are emerging as the most promising area of research within the area of biological materials science and engineering. The technological significance of this area is immense for applications as diverse as tissue engineering and drug delivery biosystems to biomimicked sensors and optical devices. Bioinspired, Biomimetic and Nanobiomaterials provides a unique scholarly forum for discussion and reporting of structure sensitive functional properties of nature inspired materials.