Abstract
The surface of synthetic colloidal calcium hydroxyapatite (Ca 10(PO 4) 6(OH) 2; CaHap) was treated with pyrophosphoric acid (H 4P 2O 7; PP) in acetone and the materials were characterized by XRD, thermal analysis, N 2 adsorption, TEM, and FTIR. No remarkable change in XRD patterns or in particle morphology by the modification was observed. The additional amount of PO 4 of CaHap was increased with an increase in PP concentration. The Ca/P molar ratio of CaHap was decreased from 1.62 to 1.35 by the modification. IR results indicated that the PP reacts with surface POH groups of CaHap to form additional surface POH groups as follows: surface POH+H 4P 2O 7→ surface POPO(OH) 2 + H 3PO 4. When the modified CaHap with Ca/P molar ratio less than 1.50 was treated at 850 °C in air, the materials transformed into β-Ca 3(PO 4) 2.
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