Synthesis and Characterization of Bionic Nano-silicon-substituted Hydroxyapatite

To explore the synthesis condition of the bionic nano-silicon-substituted hydroxyapatite and the impact of the silicon content on its crystallization properties, hydroxyapatite of different silicon content were synthesized from Ca(NO3)2, (NH4)2HPO4 and Si(OCH2CH3)4(TEOS) via an aqueous precipitation reaction. Fourier transform infrared spectroscopy (FTIR), X-ray fluorescence spectrum (XRF), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used for hydroxyapatite characterization. The results show that relative low temperature (40 is conducive to obtain pure bionic nano-silicon-substituted hydroxyapatite. Under this condition, SiO44- enters the lattice of hydroxyapatite and replaces part of PO43-. The more the content of silicon is, the lower the crystallinity is, the smaller the grain size is and the higher the lattice parameters a and c are.