抄録
Three types of hydroxyapatite (HAp) were prepared by adding an H3PO4 solution into a Ca(OH)2 suspension at room temperature, 50°C and 80°C. The crystals had plate-like shape elongated along the c-axis. The CO2 content and adsorbed water decreased with the elevating reaction temperature. The crystal grew approximately 50 nm below 50°C and the grain grew nearly 200 nm at 80°C. The secondary particle size prepared at each temperature was in the order: 80°C << room temperature <50°C. The particle size distributions showed that the 50vol% sizes of HAp prepared at room temperature and 50°C were 4.2 and 7.5 μm, respectively, and that they aggregated strongly. In the case of HAp prepared at 80°C, the particles consisted mainly submicron grains (0.4 μm in 50vol%-size) and were hard to aggregate.
