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  

A strong and tough hydroxyapatite-based fiber with enamel-inspired hierarchical structure

作　　者：丁宝森 刘少佳 卢俊峰 郭一然 郑天 赵赫威 郭林 Baosen Ding;Shaojia Liu;Junfeng Lu;Yiran Guo;Tian Zheng;Hewei Zhao;Lin Guo(School of Chemistry,Beihang University,Beijing 100191,China)

机构地区：[1]School of Chemistry,Beihang University,Beijing 100191,China

出　　处：《Science China Materials》2024年第8期2496-2504,共9页中国科学（材料科学）（英文版）

基　　金：supported by the National Key R&D Program of China(2020YFA0710403,2020YFA0710404);the National Natural Science Foundation of China(52222203,52073008,52250119);Beijing Municipal Science&Technology Commission(221100007422088);China Postdoctoral Science Foundation Funded Project(BX20220372,2023M730159)。

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.The hierarchical structure of tooth enamel can inspire the preparation of high strength and high toughness biomimetic composites,but fully mimicking the entire hierarchy 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 macroscopic fiber through shear-induced assembly.The highly ordered nanowire-microbundle structure as well as the strong interfacial connection between HAP nanowires,HAP microbundles,and the polymer matrix,leads to a hierarchical energy 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 enamelinspired design strategy provides a new sight into the development of high strength and high toughness fibers for potential engineering and bio-repair applications.

关 键 词：牙釉质 羟基磷灰石 长程有序 高强高韧 聚合物基体 界面连接 多级结构 能量耗散 

分 类 号：TQ343[化学工程—化纤工业] R783.1[医药卫生—口腔医学]