Punctual investigation of surface sites of HA and magnesium-HA

L. Bertinetti, Anna Tampieri, E. Landi, G. Martra, S. Coluccia

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

IR spectroscopy of adsorbed CO is used for the first time to characterize surface cationic centres of pure and magnesium doped hydroxyapatite (HA and MHA, respectively). In air, water molecules saturate the coordination sphere of exposed surface cations by a strong coordinative interaction. At first, the materials were outgassed at 300 °C in order to remove water molecules adsorbed on the surface. Following this treatment, surface sites able to adsorb CO are produced. The vibrational frequency of adsorbed CO is sensitive to the features of the adsorbing sites. The IR spectra of CO adsorbed on HA revealed the presence of surface Ca2+ ions differing for the degree of coordinative unsaturation and of P OH groups. On MHA, CO was able to monitor the presence of surface Mg2+ ions, the amount of which increased by aging the material in air.

Original languageEnglish (US)
Pages (from-to)987-991
Number of pages5
JournalJournal of the European Ceramic Society
Volume26
Issue number6
DOIs
StatePublished - Jan 24 2006

Keywords

  • Apatite
  • Biomedical applications
  • Magnesium
  • Spectroscopy
  • Surfaces

ASJC Scopus subject areas

  • Ceramics and Composites

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