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首页> 外文期刊>Crystal growth & design >Facile One-Pot Synthesis of Oriented Pure Hydroxyapatite with Hierarchical Architecture by Topotactic Conversion
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Facile One-Pot Synthesis of Oriented Pure Hydroxyapatite with Hierarchical Architecture by Topotactic Conversion

机译：电位转化法方便地合成具有分层结构的定向纯羟基磷灰石

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摘要

The oriented hierarchical architecture of hydroxyapatite (HA) shows excellent performance in multiple functions in human hard tissues such as bone and teeth. It is a challenge to mimic the architecture of biomineralization products. This study introduces a simple method for the hierarchical architecture of pure stoichiometric HA by a one-pot hydrothermal process without adding any organic molecules. The reaction process is researched by XRD, FT-IR, SEM, and TEM, and the HA crystal growth mechanism is discussed. The short rod-like HA nanocrystals are orderly assembled into micrometer-sized platy particles with the DCPD (CaHPO4 center dot 2H(2)O, brushite) shape retained. The ordered HA hierarchical architectures are achieved through topotactic transformation due to the crystal structural similarity from DCPD through DCPA (CaHPO4, monetite) to HA. It is found for the first time that the growth of HA crystals on DCPA is accompanied by orientation relationship of HA [1(-) 10] // DCPA [110] and HA (112) // DCPA (1 (-)12). The resemblance between the crystal structures promotes the direct phase transition. The results provide new insights into the formation mechanism of ordered HA hierarchical architectures and give hints for designing hierarchically assembled nanoarchitecture in synthetic work.
机译：羟基磷灰石（HA）的定向层次结构在人类硬组织（例如骨骼和牙齿）的多种功能中显示出出色的性能。模仿生物矿化产品的架构是一项挑战。这项研究介绍了一种简单的方法，该方法通过一锅水热过程无需添加任何有机分子即可实现纯化学计量HA的分层体系结构。通过XRD，FT-IR，SEM和TEM研究了反应过程，并讨论了HA晶体的生长机理。短棒状HA纳米晶体被顺序组装成微米级的片状颗粒，并保留了DCPD（CaHPO4中心点2H（2）O，透钙磷石）形状。由于从DCPD到DCPA（CaHPO4，三方铁矿）到HA的晶体结构相似性，有序的HA层次结构是通过全向变换实现的。首次发现HA晶体在DCPA上的生长伴随着HA [1（-）10] // DCPA [110]和HA（112）// DCPA（1（-）12）的取向关系。 。晶体结构之间的相似性促进了直接相变。结果为有序的HA层次结构的形成机理提供了新的见解，并为在合成工作中设计分层组装的纳米体系结构提供了提示。

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