Revisiting silicate substituted hydroxyapatite by solid-state NMR

G. Gasquères, C. Bonhomme, J. Maquet, F. Babonneau, S. Hayakawa, T. Kanaya, A. Osaka

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46 Citations (Scopus)


Silicon-substituted hydroxyapatite (Si-HAp) has shown promising properties such as high-bone remodeling around implants. So far, the techniques used for the structural characterization of the Si-HAp have given indirect evidence of the presence of silicon inside the structure (by X-ray and neutron diffraction). In this paper, we focus on Si-HAp derivatives obtained by a precipitation method (widely described in the literature). We demonstrate here by solid-state NMR spectroscopy that only a fraction of the silicon atoms are incorporated into the HAp lattice in the form of Q0 (SiO44-) species, for 4.6 wt% Si-HAp. A large amount of silicate units are located outside the HAp structure and correspond to silica-gel units. All results were established through 29Si MAS, 1H → 29Si CP MAS and T1ρ(1H) edited 1H → 29Si CP MAS experiments. This last pulse scheme acted as a powerful editing sequence, leading to unambiguous spectroscopic conclusions, concerning the location of the SiO44- moieties.

Original languageEnglish
Pages (from-to)342-346
Number of pages5
JournalMagnetic Resonance in Chemistry
Issue number4
Publication statusPublished - Apr 1 2008


  • Hydroxyapatite
  • Si CP MAS experiments
  • Silicon-substituted HAp
  • Solid-state NMR
  • T ρ(H) edited H →

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)


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