Effect of alkali earth oxides on hydroxy-carbonated apatite nano layer formation for sio2 bao cao na2 o p2o5 glass system

Abstract

Barium soda lime phosphosilicate [(58SiO2 (32-x)BaO xCao 6Na2 O 4P2O5 (where x = 15, 20, 25 and 30 mol%)] samples were synthesised using conventional sol gel method at 700 C sintering temperature. Thermal, structural properties were studied using thermo gravimetric analysis and differential thermal analysis, X-ray diffraction, scanning electron microscopy, fourier transform infrared and Raman spectroscopy. Using Raman spectra non-bridging oxygen concentrations were estimated. The hydroxy-carbonated apatite (HCA) layer formation on samples was analysed for 7 days using simulated body fluid (SBF) soaked samples. The growth of HCA layers self-assembled on the sample surface was discussed as a function of NBO/BO ratio. Results indicated that the number of Ca2? ions released into SBF solution in dissolution process and weight loss of SB-treated samples vary with NBO/BO ratio. The changes in NBO/BO ratios were observed to be proportional to HCA forming ability of barium soda lime phosphosilicate glasses. Springer. All rights reserved.