Structural and physico-chemical analysis of calcium/ strontium substituted, near-invert phosphate based glasses for biomedical applications

Patel, U. and Moss, R.M. and Hossain, Kazi Md Zakir and Kennedy, Andrew R. and Ahmed, Ifty and Hannon, Alex C. (2017) Structural and physico-chemical analysis of calcium/ strontium substituted, near-invert phosphate based glasses for biomedical applications. Acta Biomaterialia, 60. pp. 109-127. ISSN 1742-7061

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Neutron diffraction, 23Na and 31P NMR and FTIR spectroscopy have been used to investigate the structural effects of substituting CaO with SrO in a 40P2O5textperiodcentered(16 x)CaOtextperiodcentered20Na2Otextperiodcentered24MgOtextperiodcenteredxSrO glass, where x is 0, 4, 8, 12 and 16 mol The 31P solid-state NMR results showed similar amounts of Q1 and Q2 units for all of the multicomponent glasses investigated, showing that the substitution of Sr for Ca has no effect on the phosphate network. The M-O= coordinations (M= Mg, Ca, Sr, Na) were determined for binary alkali and alkaline earth metaphosphates using neutron diffraction and broad asymmetric distributions of bond length were observed, with coordination numbers that were smaller and bond lengths that were shorter than in corresponding crystals. The Mg-O coordination number was determined most reliably as 5.0(2). The neutron diffraction results for the multicomponent glasses are consistent with a structural model in which the coordination of Ca, Sr and Na is the same as in the binary metaphosphate glass, whereas there is a definite shift of Mg-O bonds to longer distance. There is also a small but consistent increase in the Mg-O coordination number and the width of the distribution of Mg-O bond lengths, as Sr substitutes for Ca. Functional properties, including glass transition temperatures, thermal processing windows, dissolution rates and ion release profiles were also investigated. Dissolution studies showed a decrease in dissolution rate with initial addition of 4 mol% SrO, but further addition of SrO showed little change. The ion release profiles followed a similar trend to the dissolution rates observed. The limited changes in structure and dissolution rates observed for substitution of Ca with Sr in these fixed 40 mol% P2O5 glasses were attributed to their similarities in terms of ionic size and charge.

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Journal Article
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Acta Biomaterialia
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This is the author’s version of a work that was accepted for publication in Acta Biomaterialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Biomaterialia, 60, 2017 DOI: 10.1016/j.actbio.2017.07.002
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06 Oct 2017 19:36
Last Modified:
18 Sep 2020 03:43