Structural study of Al2O3-Na2O-CaO-P2O5 bioactive glasses as a function of aluminium content

Smith, J.M. and King, S.P. and Barney, E.R. and Hanna, J.V. and Newport, Robert J. and Pickup, D.M. (2013) Structural study of Al2O3-Na2O-CaO-P2O5 bioactive glasses as a function of aluminium content. The Journal of Chemical Physics, 138 (3). p. 34501. ISSN 1089-7690. (doi:https://doi.org/10.1063/1.4774330) (Full text available)

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Abstract

Calcium phosphate based biomaterials are extensively used in the context of tissue engineering: small changes in composition can lead to significant changes in properties allowing their use in a wide range of applications. Samples of composition (Al2O3)x(Na2O)0.11-x(CaO)0.445(P2O5)0.445, where x = 0, 0.03, 0.05, and 0.08, were prepared by melt quenching. The atomic-scale structure has been studied using neutron diffraction and solid state 27Al MAS NMR, and these data have been rationalised with the determined density of the final glass product. With increasing aluminium concentration the density increases initially, but beyond about 3 mol. % Al2O3 the density starts to decrease. Neutron diffraction data show a concomitant change in the aluminium speciation, which is confirmed by 27Al MAS NMR studies. The NMR data reveal that aluminium is present in 4, 5, and 6-fold coordination and that the relative concentrations of these environments change with increasing aluminium concentration. Materials containing aluminium in 6-fold coordination tend to have higher densities than analogous materials with the aluminium found in 4-fold coordination. Thus, the density changes may readily be explained in terms of an increase in the relative concentration of 4-coordinated aluminium at the expense of 6-fold aluminium as the Al2O3 content is increased beyond 3 mol. %.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J Chem Phys [Field not mapped to EPrints] C2 - 23343279 [Field not mapped to EPrints] AD - School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom. [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: aluminum, aluminum oxide, calcium derivative, calcium oxide, glass, oxide, phosphorus derivative, phosphorus pentoxide, sodium derivative, sodium oxide, article, chemistry, nuclear magnetic resonance spectroscopy, Aluminum, Aluminum Oxide, Calcium Compounds, Glass, Magnetic Resonance Spectroscopy, Oxides, Phosphorus Compounds, Sodium Compounds
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 10 Feb 2015 11:58 UTC
Last Modified: 16 Apr 2019 09:32 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46952 (The current URI for this page, for reference purposes)
Newport, Robert J.: https://orcid.org/0000-0002-2365-992X
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