Skipper, Laura J., Sowrey, Frank E., Rashid, Rumana, Newport, Robert J., Lin, Z., Smith, Mark E. (2005) X-ray diffraction and solid state NMR studies of the growth of hydroxyapatite on bioactive calcia : silica sol-gel glasses. Physics and Chemistry of Glasses, 46 (4). pp. 372-376. ISSN 0031-9090. (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:8227)
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Abstract
An advanced materials characterisation methodology has been used to examine systematically a range of sol-gel glass materials of contemporary biomedical interest. High energy X-ray total diffraction, X-ray fluorescence and Raman spectroscopy, and isotope-enriched O-17 and P-31 MAS NMR have been used to study the local calcium environment in four sol-gel derived bioactive calcium silicate glasses of the general formula (CaO)(x)(SiO2)(1-x), and to gain an atomic scale insight into the nature of the processes initiated when this bioactive glass is immersed in vitro in simulated body fluid (SBF). The results reveal a rapid dissolution of the labile surface calcium ions from the glass within 30 min of immersion in SBF and the later formation of a hydroxyapatite like layer, which MAS NMR suggests is partially ordered locally, but which X-ray diffraction confirms as amorphous overall Annealing the samples at 650 degrees C allows this layer to crystallise, revealing the anticipated hydroxyapatite layer more clearly. The results presented here are consistent with, but greatly extend our previous XRD, Ca-43 and Si-29 MAS-NMR, XANES and EXAFS studies of these materials.
Item Type: | Article |
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Subjects: | Q Science |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Depositing User: | Robert Newport |
Date Deposited: | 12 Jul 2008 16:19 UTC |
Last Modified: | 16 Nov 2021 09:46 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/8227 (The current URI for this page, for reference purposes) |
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