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Thorough analysis of silicon substitution in biphasic calcium phosphate bioceramics: A multi-technique study

Paper ID Volume ID Publish Year Pages File Format Full-Text
2292 107 2010 11 PDF Available
Title
Thorough analysis of silicon substitution in biphasic calcium phosphate bioceramics: A multi-technique study
Abstract

Four samples of composition Ca10(PO4)6−x(SiO4)x(OH)2−x, with x = 0.0, 0.1, 0.2 and 0.5, were prepared and characterized using powder X-ray and neutron powder diffraction, and 1H, 31P and 29Si nuclear magnetic resonance (NMR) spectroscopy. The composition of the Si-substituted HAp phases was determined by joint Rietveld refinements from powder X-ray and powder neutron diffraction data. Taking into account electroneutrality, a chemical formula for the Si-substituted HAp phases with indication of the incorporated silicate amount is proposed. Solid-state 29Si NMR confirms the presence of only Q0 species, in good agreement with the presence of substituted HAp and β-TCP phases only. Thanks to NMR spectroscopy, two types of protons in the Si-substituted HAp phase were identified, the new site corresponding to species engaged in hydrogen bonding with silicate anions. This allowed further refinement of the formulae for these phases with very good quantitative agreement for populations derived from the refinement and integration of NMR data.

Keywords
Bioceramics; Silicon substitution; Hydroxyapatite; β-TCP; Rietveld refinement
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 8, August 2010, Pages 3264–3274
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us