Nanostructure of nacre and its mechanical effects
Nanostructure of nacre and its mechanical effects
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珍珠层的纳米结构及其力学效应
DOI：
10.1515/ijnsns.2002.3.3-4.257
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发表时间：
2002-01-01
影响因子：
1.5
通讯作者：
Bai, YL
中科院分区：
文献类型：
--
作者：
Song, F;Bai, YL
用透射电子显微镜直接观察到珍珠岩有机基质界面上的一种纳米结构，这种结构在生物矿化过程中被称为矿物桥。证实了珍珠岩中矿桥的存在。统计分析给出了有机基质界面纳米结构的几何特征和分布规律。力学试验和分析表明，矿物桥对珍珠岩的力学性质起着关键作用。该纳米结构不仅可以有效地提高有机基质界面的抗裂性，而且可以自动形成周期性的抗裂性，防止裂纹在珍珠层中扩展。这表明珍珠层的微结构应该被称为“砖-桥-砂浆”的结构，而不是传统的“砖和砂浆”结构，这为合成材料的仿生设计提供了概念性的指导。
A type of nanostructure in the organic matrix interfaces of nacre, which is referred to as mineral bridge in the biomineralization, is directly observed with a transmission electron microscope. It is showed that the existence of mineral bridges in nacre is confirmed. Statistical analysis gives the geometrical characteristics and distribution law of the nanostructure in the organic matrix interfaces. Mechanical experiments and analyses demonstrate that mineral bridges play a key role in mechanical properties of nacre. The nanostructure can not only effectively increase the crack resistance of the organic matrix interfaces, but also automatically form periodic crack resistance to prevent cracks from extending in nacre. This is an indication that the microarchitecture of nacre should be referred to as a "brick-bridge-mortar" arrangement rather than traditional "brick and mortar" one, which gives a conceptual guide to the biomimetic design of synthetic materials.