Abstract
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 language | English |
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Pages (from-to) | 342-346 |
Number of pages | 5 |
Journal | Magnetic Resonance in Chemistry |
Volume | 46 |
Issue number | 4 |
DOIs | |
Publication status | Published - Apr 1 2008 |
Keywords
- 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)