Biomimetic Synthesis and Characterization of Hydroxyapatite Crystal with Low Phase Transformation Temperature

详细信息    查看全文

• 作者：Hongshi Zhao ; Wen He ; Yingjun Wang ; Xudong Zhang ; Zhengmao Li ; Shunpu Yan ; Weijia Zhou
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2008
• 出版时间：December 11, 2008
• 年：2008
• 卷：53
• 期：12
• 页码：2735-2738
• 全文大小：217K
• 年卷期：v.53,no.12(December 11, 2008)
• ISSN：1520-5134

文摘

Hydroxyapatite (HA) with a low phase transformation temperature was synthesized via a biomimetic route using ovalbumin as a natural biosurfactant. The resulting materials were characterized by means of X-ray diffraction (XRD), differential thermal analysis (DTA), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The results show that needle-like HA nanocrystals can be obtained at room temperature. The HA crystals can transform to β-tricalcium phosphate (β-TCP) nanocrystals as low as about 550 °C. Furthermore, it is proved using the electrophoretic method that there are superfluous positive charges on the surface of the HA particles. The substitution of PO₄³⁻ ions by CO₃²⁻ ions in the HA crystal is the predominant factor in affecting the low phase transformation and the surface electrical charges of the particles. A schematic illustration was used to depict the protein-medicated crystallization of HA crystals with positive charges.