Issue 31, 2009
From the journal:

Journal of Materials Chemistry

Structure of fluoride-containing bioactive glasses

Delia S. Brauer,*a   Natalia Karpukhina,a   Robert V. Lawb  and  Robert G. Hillac  

* Corresponding authors

a Imperial College, Department of Materials, Exhibition Road, London, UK
E-mail: d.brauer@imperial.ac.uk
Fax: +44 207 594 6757
Tel: +44 207 594 6385

b Imperial College, Department of Chemistry, Exhibition Road, London, UK

c Barts and The London, Unit of Dental and Physical Sciences, Mile End Road, London, UK

Abstract

Fluoride prevents dental cavities, stimulates bone mineralisation and decreases the melting temperature of glasses and is therefore an interesting component of bioactive glasses for use as dental or orthopaedic biomaterials. However, when designing new glass compositions, the structural role of fluoride in the glass needs to be better understood. We have characterised a glass series in the system SiO2–P2O5–CaO–Na2O with increasing concentrations of CaF2. Network connectivity was fixed at 2.13 by adding CaF2 while the ratio of all other components was kept constant. 19F and 29Si MAS NMR spectra showed that addition of CaF2 does not cause disruption of the glass network by formation of Si–F bonds but forms mixed calcium sodium fluoride species. 31P MAS NMR showed phosphate being present as orthophosphate. Hence it does not form part of the actual glass network backbone and no Si–O–P bonds are present. 23Na MAS NMR showed the presence of multiple sodium sites with an increase in the mean coordination number of sodium with increasing CaF2 content. The glass transition temperature decreased with increasing amounts of CaF2. As no Si–F bonds were formed, this can be explained by formation of hypothetical CaF+ species. The results can be used for designing new fluoride-containing bioactive glass compositions for specific applications.

Graphical abstract: Structure of fluoride-containing bioactive glasses

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Article information

DOI
https://doi.org/10.1039/B900956F
Article type
Paper
Submitted
16 Jan 2009
Accepted
11 May 2009
First published
22 Jun 2009

J. Mater. Chem., 2009,19, 5629-5636

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Structure of fluoride-containing bioactive glasses

D. S. Brauer, N. Karpukhina, R. V. Law and R. G. Hill, J. Mater. Chem., 2009, 19, 5629 DOI: 10.1039/B900956F

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