Structural characteristics of antibacterial bioresorbable phosphate glass

Moss, Robert M. and Pickup, David M. and Ahmed, Ifty and Knowles, Jonathan C. and Smith, Mark E. and Newport, Robert J. (2008) Structural characteristics of antibacterial bioresorbable phosphate glass. Advanced Functional Materials, 18 (4). pp. 634-639. ISSN 1616-3028

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Neutron diffraction with isotopic substitution has been used to probe the local environment of silver in a melt-quench derived bioresorbable phosphate glass. Samples enriched with Ag-107 and Ag-109 were prepared and neutron diffraction data collected. A first-order difference was taken between the data sets to give detailed information about the silver environment in the glass matrix. The measured Ag-O correlation has three components in the first coordination shell at 2.28 angstrom, 2.51 angstrom, and 2.58 angstrom with coordination numbers of 2.1,23, and 1.1, respectively, consistent with silver occupying a distorted octahedral environment. These results have been correlated with those from Ag K-edge X-ray absorption near-edge spectroscopy measurements. The results suggest that the addition of silver to the (CaO)(0.3)(Na2O)(0.2)(P2O5)(0.5) system has a significant effect on the host phosphate network, with shorter and more branched chains replacing the long chains and rings normally associated with the metaphosphate composition.

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Journal Article
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Advanced Functional Materials
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29 Feb 2012 10:18
Last Modified:
16 Sep 2023 00:40