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To browse Academia. Melissa Beattie. Krystelle Mafina. To date, it has been hypothesised that the silicon is present either in the form of silicate groups site-specifically substituted in the hydroxyapatite lattice for phosphate groups, or that there may be an amorphous silicon-rich phase in the vicinity of the grain boundaries.
Solid state nuclear magnetic resonance SSNMR spectroscopy was undertaken to view the elemental interactions using phosphorus 31P and silicon 29Si probes in order to confirm or refute the presence of silicate groups in relation to phosphate groups in the bulk material structure. The analysis was performed on stoichiometric hydroxyapatite HA and silicate-substituted hydroxyapatite SA with a nominal silicon content of 0. XRD confirmed all forms of powder were phase pure, FTIR confirmed both hydroxyl and phosphate group functionality in all forms of powder in both HA and SA, while silicate group functionality was only observed in all forms of SA powders.
SSNMR using 31P and 29Si coupled probes demonstrated that as the crystallinity of the powders increased from the precipitate to the sintered form, the signal associated with the presence of a silicate group in the phosphate environment developed as the crystal structure becomes more ordered.
These results support the hypothesis that in SA containing 0. This observation may be key to understanding the mechanisms by which the introduction of 0. El film es tan excesivo y aturdidor que el efecto final es : «eso no puede ser; sencillamente, es demasiado».