A Solid-State NMR Study of Selenium Substitution into Nanocrystalline Hydroxyapatite
AbstractThe substitution of selenium oxyanions in the hydroxyapatite structure was examined using multinuclear solid-state resonance spectroscopy (ssNMR). The study was supported by powder X-ray diffractometry (PXRD) and wavelength dispersion X-ray fluorescence (WD-XRF). Samples of pure hydroxyapatite (HA300) and selenate (HA300-1.2SeO4) or selenite (HA300-1.2SeO3) substituted hydroxyapatites were synthesized using the standard wet method and heated at 300 °C to remove loosely bonded water. PXRD data showed that all samples are single-phase, nanocrystalline hydroxyapatite. The incorporation of selenite and selenate ions affected the lattice constants. In selenium-containing samples the concentration of Se was very similar and amounted to 9.55% and 9.64%, for HA300-1.2SeO4 and HA300-1.2SeO3, respectively. PXRD and ssNMR data showed that the selenite doping significantly decreases the crystallite size and crystallinity degree. 31P and 1H NMR experiments demonstrated the developed surface hydrated layer in all samples, especially in HA300-1.2SeO3. 1H NMR studies showed the dehydroxylation of HA during the selenium oxyanions substitution and the existence of hydrogen bonding in structural hydroxyl group channels. 1H→77Se cross polarization NMR experiments indicated that selenites and selenates are located in the crystal lattice and on the crystal surface. View Full-Text
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
Kolmas, J.; Kuras, M.; Oledzka, E.; Sobczak, M. A Solid-State NMR Study of Selenium Substitution into Nanocrystalline Hydroxyapatite. Int. J. Mol. Sci. 2015, 16, 11452-11464.
Kolmas J, Kuras M, Oledzka E, Sobczak M. A Solid-State NMR Study of Selenium Substitution into Nanocrystalline Hydroxyapatite. International Journal of Molecular Sciences. 2015; 16(5):11452-11464.Chicago/Turabian Style
Kolmas, Joanna; Kuras, Marzena; Oledzka, Ewa; Sobczak, Marcin. 2015. "A Solid-State NMR Study of Selenium Substitution into Nanocrystalline Hydroxyapatite." Int. J. Mol. Sci. 16, no. 5: 11452-11464.