孙瑞雪

教授

教授 硕士生导师

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所在单位:材料学院综合办公室

学历:博士研究生

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Controlled synthesis and thermal stability of hydroxyapatite hierarchical microstructures

发布时间:2021-03-15 点击次数:

关键字:Ceramics; Nanostructures; Crystal growth; X-ray diffraction; Crystal structure
摘要:Hydroxyapatite (HAp) hierarchical microstructures with novel 3D morphology were prepared through a template- and surfactant-free hydrothermal homogeneous precipitation method. Field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) were used to characterize the morphology and composition of the synthesized products. Interestingly, the obtained HAp with 3D structure is composed of one-dimensional. (1D) nanorods or two-dimensional (2D) nanoribbons, and the length and morphology of these building blocks can be controlled through controlling the pH of the reaction. The building blocks are single crystalline and have different preferential orientation growth under different pH conditions. At low pH values, octacalcium phosphate (OCP) phase formed first and then transformed into HAp phase due to the increased pH value caused by the decomposition of urea. The investigation on the thermal stability reveals that the prepared HAp hierarchical microstructures are morphologically and structurally stable up to 800 degrees C. (c) 2012 Elsevier Ltd. All rights reserved.
卷号:48
期号:3
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