GROWTH MECHANISM OF WHISKER-LIKE HYDROXYAPATITE CRYSTALS VIA BUFFER SOLUTION

抄録

The whisker-like hydroxyapatite (HAp) crystals have been synthesized by the precipitation reaction of the buffer solution containing calcium acetate and phosphoric acid. The growth mechanism of the whisker-like HAp prepared at 90°C for various heating time was studied by analyzing the morphology, composition and structures of the precipitates. It was found that during the precipitation reaction, the whisker-like octacalcium phosphate (OCP) crystals formed at first from the dehydration reaction of brushite, and the structure then gradually converted from OCP to HAp as the heating time increased. The Ca/P atomic ratios of whisker-like HAp varied from 1.60 to 1.67 depending on the heating time.