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Preparation, structural characterisation and antibacterial properties of Ga-doped sol-gel phosphate-based glass

Pickup, D.M.; Valappil, S.P.; Moss, R.M.; Twyman, H.L.; Guerry, P.; Smith, M.E.; Wilson, M.; Knowles, J.C. and Newport, R.J. (2009) Preparation, structural characterisation and antibacterial properties of Ga-doped sol-gel phosphate-based glass. Journal of Materials Science, 44 (7). pp. 1858-1867. ISSN 0022-2461

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Abstract

A sol-gel preparation of Ga-doped phosphate-based glass with potential application in antimicrobial devices has been developed. Samples of composition (CaO)0.30(Na2O)0.20-x(Ga2O3)x(P2O5)0.50 where x = 0 and 0.03 were prepared, and the structure and properties of the gallium-doped sample compared with those of the sample containing no gallium. Analysis of the 31P MAS NMR data demonstrated that addition of gallium to the sol-gel reaction increases the connectivity of the phosphate network at the expense of hydroxyl groups. This premise is supported by the results of the elemental analysis which showed that the gallium-free sample contains significantly more hydrogen and by FTIR spectroscopy, which revealed a higher concentration of OH groups in that sample. Ga K-edge EXAFS and XANES data revealed that the gallium ions are coordinated by six oxygen atoms. In agreement with the X-ray absorption data, the high-energy XRD results also suggest that the Ga3+ ions are octahedrally coordinated with respect to oxygen. Antimicrobial studies demonstrated that the sample containing Ga3+ ions had significant activity against Staphylococcus aureus compared to the control.

Item Type:Article
Additional Information:Issue April 2009. Published online: 3 February 2009.
Uncontrolled Keywords:hydroxyl groups; gallium-free; spectroscopy; Ga3+ ions; Antimicrobial; Staphylococcus; aureus
Subjects:R Medicine > RK Dentistry
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Medicine > School of Dental Sciences
DOI:10.1007/s10853-008-3237-2
Publisher's Statement:© Springer Science+Business Media, LLC 2009. http://dx.doi.org/10.1007/s10853-008-3237-2. The original publication is available at springerlink.com
Refereed:Yes
Status:Published
ID Code:1062
Deposited On:06 Apr 2009 09:56
Last Modified:22 Feb 2012 15:32

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