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Journal of Materials Science

, Volume 42, Issue 23, pp 9827–9835 | Cite as

The structure and properties of silver-doped phosphate-based glasses

  • I. Ahmed
  • E. A. Abou Neel
  • S. P. Valappil
  • S. N. Nazhat
  • D. M. Pickup
  • D. Carta
  • D. L. Carroll
  • R. J. Newport
  • M. E. Smith
  • J. C. Knowles
Article

Abstract

An undoped and two silver-doped (0, 3 and 5 mol% Ag) phosphate glass compositions were investigated for their structure and properties. These compositions had in a previous study been investigated for their antimicrobial properties, and were found to be extremely potent at inhibiting the micro-organisms tested. Thermal, X-ray diffraction (XRD), nuclear magnetic resonance (NMR) and X-ray absorption Near Edge Structure (XANES) studies were used to elucidate the structure of the compositions investigated, whilst degradation and ion release studies were conducted to investigate their properties. No significant differences were found between the T g values of the silver containing glasses, while XRD analysis revealed the presence of a NaCa(PO3)3 phase. NMR showed the dominance of Q2 species, and XANES studies revealed the oxidation state of silver to be in the +1 form. No correlation was seen between the degradation and cation release profiles observed, and the P3O 9 3− anion was the highest released anionic species, which correlated well with the XRD and NMR studies. Overall, it was ascertained that using Ag2SO4 as a precursor, and producing compositions containing 3 and 5 mol% Ag, the levels of silver ions released were within the acceptable cyto/biocompatible range.

Keywords

Ag2O Nuclear Magnetic Resonance Study Ag3PO4 Ag2SO4 Silver Sulphate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

EPSRC is thanked for funding the UCL-Kent-Warwick collaboration on phosphate biomaterials through grants GR/T21080, EP/C000714 and EP/C000633. M.E. Smith also thanks EPSRC and the University of Warwick for partial funding of the NMR infrastructure.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • I. Ahmed
    • 1
  • E. A. Abou Neel
    • 1
  • S. P. Valappil
    • 1
  • S. N. Nazhat
    • 1
    • 2
  • D. M. Pickup
    • 3
  • D. Carta
    • 3
  • D. L. Carroll
    • 4
  • R. J. Newport
    • 3
  • M. E. Smith
    • 4
  • J. C. Knowles
    • 1
  1. 1.Division of Biomaterials and Tissue EngineeringEastman Dental Institute, University College LondonLondonUK
  2. 2.Department of Mining, Metals, and Materials EngineeringMcGill UniversityQCCanada
  3. 3.School of Physical SciencesUniversity of KentCanterburyUK
  4. 4.Department of PhysicsUniversity of WarwickCoventryUK

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