Pickup, D. M., Valappil, S. P., Moss, R. M., Twyman, H. L., Guerry, Paul, Smith, Mark 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, Vol.44 (No.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 P-31 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 extended X-ray absorption fine structure and X-ray absorption near-edge structure 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:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Administration > Vice Chancellor's Office Faculty of Science > Physics
Journal or Publication Title:	Journal of Materials Science
Publisher:	Springer
ISSN:	0022-2461
Date:	April 2009
Volume:	Vol.44
Number:	No.7
Number of Pages:	10
Page Range:	pp. 1858-1867
Identification Number:	10.1007/s10853-008-3237-2
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Engineering and Physical Sciences Research Council (EPSRC)
Grant number:	EP/C000714 (EPSRC), EP/C000633 (EPSRC), GR/T21080 (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/28204

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