X-ray diffraction and solid state NMR studies of the growth of hydroxyapatite on bioactive calcia : silica sol-gel glasses
UNSPECIFIED (2005) X-ray diffraction and solid state NMR studies of the growth of hydroxyapatite on bioactive calcia : silica sol-gel glasses. In: 9th International Conference on the Structure of Non-Crystalline Materials (NCM9), JUL 11-15, 2004, Alfred Univ, Corning, NY.Full text not available from this repository.
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:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QD Chemistry
T Technology > TP Chemical technology
|Journal or Publication Title:||PHYSICS AND CHEMISTRY OF GLASSES|
|Publisher:||SOC GLASS TECHNOLOGY|
|Number of Pages:||5|
|Page Range:||pp. 372-376|
|Title of Event:||9th International Conference on the Structure of Non-Crystalline Materials (NCM9)|
|Location of Event:||Alfred Univ, Corning, NY|
|Date(s) of Event:||JUL 11-15, 2004|
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