一种具有类牙釉质多级结构的高强高韧羟基磷灰石基纤维

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中文摘要：牙釉质是人体最硬的组织,力学性能优异.牙釉质内部的纳米线-微米簇-有序阵列的多级结构是其具有优异力学性能的关键.通过模仿牙釉质的微结构有望实现人造材料力学性能的突破,但是多级次模仿天然牙釉质的微结构仍是巨大的挑战.本文中,我们制备了由长程有序晶体/非晶羟基磷灰石(HAP)纳米线组成的HAP微米簇,并通过剪切诱导组装将其纺成类牙釉质高性能宏观纤维.该纤维具有高度有序的纳米线-微米簇结构,并且HAP纳米线、HAP微米簇和聚合物基体之间的强界面连接使得该纤维在受力时具有一种多级的能量耗散途径.因此该类牙釉质纤维兼具高强度(196.3 MPa)和高韧性(46.3 MJ m-3),其断裂韧性超过了先前报道的HAP基复合纤维的最大值.这种多级类牙釉质设计策略为高强度和高韧性纤维的开发提供了新的思路,在潜在的工程和生物修复领域具有广阔的应用前景.

外文标题：A strong and tough hydroxyapatite-based fiber with enamel-inspired hierarchical structure

外文摘要：The hierarchical structure of tooth enamel can inspire the preparation of high strength and high toughness biomimetic composites,but fully mimicking the entire hier-archy of tooth enamel is still challenging.Here,we show that synthetic hydroxyapatite(HAP)microbundles containing a long range of ordered crystalline/amorphous HAP nanowires can be spun into enamel-inspired high-performance macro-scopic fiber through shear-induced assembly.The highly or-dered nanowire-microbundle structure as well as the strong interfacial connection between HAP nanowires,HAP micro-bundles,and the polymer matrix,leads to a hierarchical en-ergy dissipation route,which enables this enamel-inspired fiber with a high strength and toughness of 196.3 MPa and 46.3 MJ m-3,exceeding the fracture toughness of previously reported HAP-based hybrid fibers.This hierarchical enamel-inspired design strategy provides a new sight into the devel-opment of high strength and high toughness fibers for po-tential engineering and bio-repair applications.

外文关键词：

HAP microbundleshierarchical structureenamel-inspired macroscopic fibershigh strengthhigh toughness

作者：

丁宝森、刘少佳、卢俊峰、郭一然、郑天、赵赫威、郭林

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作者单位：

School of Chemistry,Beihang University,Beijing 100191,China

关键词：

HAP microbundles hierarchical structure enamel-inspired macroscopic fibers high strength high toughness

基金：

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Municipal Science & Technology CommissionChina Postdoctoral Science Foundation Funded ProjectChina Postdoctoral Science Foundation Funded Project

项目编号：

2020YFA07104032020YFA0710404522222035207300852250119221100007422088BX202203722023M730159

出版年：

2024

DOI：

10.1007/s40843-024-2902-y

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(8)