Physicochemical studies of phosphate based P2O5–Na2O–CaO–TiO2 glasses for biomedical applications

Rajendran, V.; Devi, A. V. Gayathri; Azooz, M. A.; ElBatal, F.H.

doi:10.1016/j.jnoncrysol.2006.08.047

Cited by 77 publications

(67 citation statements)

References 30 publications

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“…It was concluded that, at low concentrations (0.5 mol%), TiO 2 acts as a network modifier; however, the further addition of TiO 2 leads to a change in the network from chain-extending Q 2 tetrahedra to chain-terminating Q 1 units. The measured pH and Ca 2+ release also confirmed the degradation results [98].…”

Section: Titanium Pyrophosphate Glassessupporting

confidence: 82%

Titanium-containing bioactive phosphate glasses

Kiani

Lakhkar

Salih

et al. 2012

Phil. Trans. R. Soc. A.

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The use of biomaterials has revolutionized the biomedical field and has received substantial attention in the last two decades. Among the various types of biomaterials, phosphate glasses have generated great interest on account of their remarkable bioactivity and favourable physical properties for various biomedical applications relating to both hard and soft tissue regeneration. This review paper focuses mainly on the development of titanium-containing phosphate-based glasses and presents an overview of the structural and physical properties. The effect of titanium incorporation on the glassy network is to introduce favourable properties. The biocompatibility of these glasses is described along with recent developments in processing methodologies, and the potential of Ti-containing phosphate-based glasses as a bone substitute material is explored.

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Section: Titanium Pyrophosphate Glassessupporting

confidence: 82%

Titanium-containing bioactive phosphate glasses

Kiani

Lakhkar

Salih

et al. 2012

Phil. Trans. R. Soc. A.

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“…The observed increase in the bulk density and T g was believed to be due to the formation of TiO 5 or TiO 4 structural units and the formation of P-O-Ti bonds. This forms ionic cross-linking between the non-bridging oxygen of two different chains that strengthen the glass structure [27][28][29]. The density (q) and T g for CNP glass with 40 mol% CaO is significantly higher than the comparable composition with 30 mol% CaO (2.58 ± 0.002 g cm À3 , 383 ± 1°C).…”

Section: Discussionmentioning

confidence: 98%

Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Neel

Chrzanowski

Valappil

et al. 2009

Journal of Non-Crystalline Solids

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

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“…Therefore, it can be suggested that the TMO modification leads to an increase in the network connectivity of the studied glasses with the mentioned order, supporting the preliminary works [10][11][12][13][14] on lithium borate glasses doped with different transition metal oxides. CaO-TiO 2 glasses [25]. The authors reported that the transition metal ions enter the glass network in a position which create a cross-linking between the phosphate tetrahedra (TM-O-P instead of P-O-P), and consequently improve the stability and mechanical properties of the glass [25].…”

Section: Resultsmentioning

confidence: 99%

“…CaO-TiO 2 glasses [25]. The authors reported that the transition metal ions enter the glass network in a position which create a cross-linking between the phosphate tetrahedra (TM-O-P instead of P-O-P), and consequently improve the stability and mechanical properties of the glass [25]. Figure 3 shows the variation of bulk (K) modulus with the molar volume of glass compositions doped with different TMOs.…”

Section: Resultsmentioning

confidence: 99%

Effect of Doping by Different Transition Metals on the Acoustical Properties of Alkali Borate Glasses

et al. 2009

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Longitudinal and shear ultrasonic wave velocities were measured in binary Li 2 O-2B 2 O 3 glasses doped with different transition metal oxides (TMOs) (where TMO = V 2 O 5 , Fe 2 O 3 , Cr 2 O 3 , NiO, TiO 2 , MnO 2 and CuO) using pulse echo technique. Measurements were carried out at 4 MHz frequency and at room temperature. Elastic moduli and some other physical parameters such as acoustic impedance, Debye temperature, thermal expansion coefficient, and latent heat of melting were calculated. Results indicated that these parameters depend upon the TMO modifier i.e., the ionic radius of the transition metal cation. Quantitative analysis has been carried out, in order to obtain more information about the structure of these glasses, based on bond compression model, and the Makishima and Mackenzie model, i.e., the cation-anion bond of each TMO.

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Physicochemical studies of phosphate based P2O5–Na2O–CaO–TiO2 glasses for biomedical applications

Cited by 77 publications

References 30 publications

Titanium-containing bioactive phosphate glasses

Titanium-containing bioactive phosphate glasses

Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Effect of Doping by Different Transition Metals on the Acoustical Properties of Alkali Borate Glasses

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