擬似体液中でカルシウム含有酸化物ガラス上に形成されたリン酸塩の^<31>PMAS-NMRによる研究

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^<31>P MAS-NMR spectra were measured for pulverized binary and ternary glasses containing Ca^<2+> ions after soaking in a simulated body fluid (Kokubo solution; pH=7.25) for 1 d, and the chemical state of adsorbed phosphate ions were examined. The ^<31>P chemical shift indicated that orthophosphate ions, H_xPO_4^<-(3-x)>(0<x<3), were adsorbed on all the glasses but 60CaO・40Al_2O_3; pyrophosphate ions, H_zP_2O_7^<-(4-z)<(0<z<4), were detected on the aluminate glass, indicating that orthophosphate ions in the Kokubo solution were dimerized on the glass surface. For the glasses such as 60CaO・40Al_2O_3, 40CaO・60B_2O_3, 40aO・30B_2O_3・30Al_2O_3 and 40CaO・30B_2O_3・30SiO_2, those phosphate ions gave broad ^<31>P MAS-NMR spectra, hence have a broad distribution by coordinating to the various surface sites of the glasses. On the other hand, sharp ^<31>P MAS-NMR spectra as for a cortical bone (rabbit) were obtained for the rest of the glasses, 50CaO・50SiO_2 and 40CaO・30B_2O_3・30TiO_2, on which apatite formed in shorter soaking period in the Kokubo solution. It was thus concluded that presence of orthophosphate ions on the glass surfaces favored the deposition of apatite.
社団法人日本セラミックス協会の論文
1996-11-01