Accurate characterization of pure silicon-substituted hydroxyapatite powders synthesized by a new precipitation route

TLDR: The results, particularly those from infrared spectroscopy, raise serious reservations about the phase purity of previously prepared and biologically evaluated SiHA powders, pellets and scaffolds in the literature.

About: This article is published in Acta Biomaterialia.The article was published on 2013-06-01 and is currently open access. It has received 88 citations till now. The article focuses on the topics: Infrared spectroscopy & Fourier transform infrared spectroscopy.

Figures

Fig. 8. 1H-31P HETCOR CP MAS experiment recorded on (a) Si1.00HA powder calcined at 400°C for 2h, and (b) Si0.50HA powder calcined at 1000°C for 15h.

Fig. 10. FTIR spectra of calcined HA and SiHA powders (1000°C / 15h) collected at room temperature, symbol ● shows additional vibrations for Si1.0HA at 500, 515, 535 cm-1.

Fig. 2. X-ray diffraction patterns of raw SiHA powders synthesized at pH = 10.8 with different silicon concentration.

Table 2 NMR parameters.

Fig. 12. FTIR spectra of calcined Si1.0HA powder (1000°C / 15h) under different partial pressure of steam (pH2O = 0, 80, 200 mbar and air).

Fig. 5: (a) selected area electron diffraction (SAED) pattern of heat treated Si1.0HA powder (1000°C/15h), (b) SAED of heat treated Si1.0HA powder (1000°C/15h) for the [0 1 0] zone axis, c/a= 0.730

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