PREPARATION OF HIGH-CONCENTRATION HYDROXYAPATITE SOLUTION BY CARBON DIOXIDE BLOWING FOR MORPHOLOGICAL CONTROL OF HYDROXYAPATITE

: Morphological control of hydroxyapatite (HAp) is very difficult because this compound has very low solubility. However, CaCO 3 , a calcium salt with the same insolubility, dissolves easily in solutions containing CO 2 . Therefore, HAp was easily dissolved by CO 2 blowing into the HAp suspension. The dissolution amount was 200 times that found without CO 2 blowing. Thus, a high-concentration HAp solution could be prepared through the simple process of CO 2 blowing. Moreover, flower-like HAp particles were deposited by outgassing the dissolved CO 2 in the HAp solution under heating.