Facile One-Pot Synthesis of Oriented Pure Hydroxyapatite with Hierarchical Architecture by Topotactic Conversion

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• 作者：Ming Wang ; Jianyong Gao ; Chao Shi ; Yingchun Zhu ; Yi Zeng ; Dalin Wang
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：December 3, 2014
• 年：2014
• 卷：14
• 期：12
• 页码：6459-6466
• 全文大小：729K
• ISSN：1528-7505

文摘

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路2H₂O, 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虆10] // DCPA [110] and HA (112) // DCPA (1虆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.