Mechanochemical-hydrothermal preparation of crystalline hydroxyapatite powders at room temperature

摘要

Crystalline hydroxyapatite (Hap) powders were prepared at room temperature from heterogeneous reaction between Ca(OH)_2 powders and (NH_4)_2HPO_4 solutions via the mechanochemical-hydrothermal route. X-ray diffraction, infrared spectroscopy, thermogravimetric characterization, and chemical analysis were performed, and it was determined that the room temperature products were phase-pure, thermally stable HA_p with a nearly stoichiometric composition. Dynamic light scattering revealed that the dispersed particle size distribution of the room temperature HA_p powders was in the range of 0.15-3.0 μm with a specific surface area of ≈90 m~2/g. Both specific surface area measurements and scanning electron microscopy confirmed that the HA_p powders consisted of agglomerates containing hundreds of ≈20 nm HA_p crystals.