Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Abou Neel, Ensanya A, Chrzanowski, Wojciech, Valappil, Sabeel P, O'Dell, Luke A, Pickup, David M, Smith, Mark E, Newport, Robert J and Knowles, Jonathan C (2009) Doping of a high calcium oxide metaphosphate glass with titanium dioxide JOURNAL OF NON-CRYSTALLINE SOLIDS, 355 (16-17). pp. 991-1000. ISSN 0022-3093, 1873-4812

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Abstract

This study investigates the effect of doping a high calcium oxide containing metaphosphate glass series (CaO)<inf>40</inf>(Na<inf>2</inf>O)<inf>10</inf>(P<inf>2</inf>O<inf>5</inf>)<inf>50</inf> with TiO<inf>2</inf> (1, 3, and 5 mol%). TiO<inf>2</inf> incorporation increased the density and glass transition temperature while reduced the degradation rate (5 mol% in particular) by twofold compared with (CaO)<inf>30</inf> system reported previously. This has been confirmed by ion release and the minimal pH changes. TiP<inf>2</inf>O<inf>7</inf>, NaCa(PO<inf>3</inf>)<inf>3</inf> and CaP<inf>2</inf>O<inf>6</inf> phases were detected for all TiO<inf>2</inf>-containing ceramics. XPS showed that the surface is composed of Ca, P, and Ti. Ti was recognized mainly as TiO<inf>2</inf>, but its total amount was lower than theoretical values. ³¹P magic angle spinning (MAS) NMR showed a downfield shift of the ³¹P lineshape with increasing TiO<inf>2</inf>, interpreted as an effect of the titanium cation rather than an increase in the phosphate network connectivity. FTIR showed that incorporation of TiO<inf>2</inf> increased the strength of the phosphate chains, and the O/P ratio while introducing more Q¹ units into the structure at the expense of the Q² units. There were no differences, however, in surface topography roughness and free energies between these glasses. These results suggested that TiO<inf>2</inf> and CaO were acting synergistically in producing glasses with controllable bulk and structural properties. © 2009 Elsevier B.V. All rights reserved.

Item Type:	Article
Additional Information:	Issue: 15 June 2009. Available online 4 May 2009.
Uncontrolled Keywords:	Bioglass, Biomaterials, Chemical durability, Glass ceramics, X-ray diffraction, Glass transition, FTIR measurements, NMR, MAS-NMR and NQR
Subjects:	?? RK ??
Divisions:	Faculty of Health & Life Sciences > Inst. Life Courses & Medical Sciences > School of Dentistry
Depositing User:	Symplectic Admin
Date Deposited:	16 Oct 2009 08:42
Last Modified:	16 Jun 2026 10:52
DOI:	10.1016/j.jnoncrysol.2009.04.016
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/1165
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