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Structural Characteristics of Antibacterial Bioresorbable Phosphate Glass
Author(s) -
Moss Robert M.,
Pickup David M.,
Ahmed Ifty,
Knowles Jonathan C.,
Smith Mark E.,
Newport Robert J.
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200700721
Subject(s) - metaphosphate , materials science , phosphate glass , neutron diffraction , octahedron , phosphate , crystallography , absorption (acoustics) , coordination number , diffraction , matrix (chemical analysis) , analytical chemistry (journal) , doping , composite material , optics , crystal structure , ion , organic chemistry , chemistry , physics , optoelectronics
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 107 Ag and 109 Ag 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 Å, 2.51 Å, and 2.58 Å with coordination numbers of 2.1, 2.7, 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 (Na 2 O) 0.2 (P 2 O 5 ) 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.