Structural characterization and physical properties of ternary CuMPt [6](M= 3d metals) alloys (original) (raw)
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Titanium-containing bioactive phosphate glasses
Philosophical Transactions of the Royal Society of London a Mathematical Physical and Engineering Sciences, 2012
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.
Preparation and Characterization of Phosphate Glasses Containing Titanium
2007
A b s t r a c t Clear bubble-free phosphate glasses, having composition 40Na 2 O-10Al 2 O 3 -xTiO 2 -(50-x)P 2 O 5 , (x = 0-20 mol %), were prepared by conventional melt quench method. Density, molar volume, glass transition temperature (Tg), MicroHardness (MH), and Thermal Expansion Coefficient (TEC) were measured as a function of TiO 2 content. Structural investigation was done using Raman and FTIR spectroscopy. Substitution of TiO 2 for P 2 O 5 up to 10 mol %, in the ternary 40Na 2 O-10Al 2 O 3 -50P 2 O 5 glass increases the density, Tg and MH. Above the 10 mol % TiO 2 content, all these properties show a reverse trend. Spectroscopic investigations reveal the depolymerization of the phosphate glass network by systematic conversion of Q 2 structural units into Q 1 and finally into Q 0 structural units. Even though Q 2 to Q 1 conversion is taking place due to breaking of P-O-P linkages, formation of P-O-Ti and P-O-Al linkages provide cross linking between short P-structural units, ...
Acta Biomaterialia, 2012
Phosphate-based glasses have been investigated for tissue engineering applications. This study details the properties and structural characterization of titanium ultra-phosphate glasses in the 55(P(2)O(5))-30(CaO)-(25-x)(Na(2)O)-x(TiO(2)) (0≤x≤5) system, which have been prepared via melt-quenching techniques. Structural characterization was achieved by a combination of X-ray diffraction (XRD), and solid-state nuclear magnetic resonance, Raman and Fourier transform infrared spectroscopies. Physical properties were also investigated using density, degradation and ion release studies; additionally, differential thermal analysis was used for thermal analysis of these glasses. The results show that with the addition of TiO(2) the density and glass transition temperature increased whereas the degradation and ion release properties are decreased. From XRD data, TiP(2)O(7) and CaP(2)O(6) were detected in 3 and 5 mol.% TiO(2)-containing glasses. Magic angle spinning nuclear magnetic resonance results confirmed that as TiO(2) is incorporated into the glass; the amount of Q(3) increases as the amount of Q(2) consequently decreases, indicating increasing polymerization of the phosphate network. Spectroscopy results also showed that the local structure of glasses changes with increasing TiO(2) content. As TiO(2) is incorporated into the glass, the phosphate connectivity increases, indicating that the addition of TiO(2) content correlates unequivocally with an increase in glass stability.
Physical properties and MAS-NMR studies of titanium phosphate-based glasses
Materials Chemistry and Physics, 2010
In this study, for a series phosphate-based glasses ((P2O5)0.45(CaO)0.3(Na2O)0.25−x(TiO2)x, 0≤x≤0.15), their degradation, ion release, surface and thermal properties have been determined. The results show that adding TiO2 was associated with a significant increase in density and glass transition temperature, but a decrease in degradation rate and ion release. 31P solid-state magic-angle-spinning nuclear magnetic resonance (MAS-NMR) showed that the local structure
Structural and in vitro characterization of TiO2-CaO-P2O5 bioglasses
Journal of Non-Crystalline Solids, 2010
Ternary titanium-calcium-phosphate glasses prepared by classical melting method were characterized through X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier transform infrared (FTIR) and Raman spectroscopy. The study of these glasses and the understanding of their structural characteristics are important for the clarification of their degradation behaviour especially in biological environments. XRD analysis confirmed the vitreous character of the samples, while SEM measurements indicated the presence of some heterogeneous domains on their surfaces. FTIR and Raman spectroscopy revealed a local network structure mainly based on Q 1 and Q 2 tetrahedrons connected by P-O-P linkages. A gradual depolymerization of the phosphate chains was observed with the addition of the titanium oxide. The surface reactivity of the samples containing 0.5 and 1 mol% TiO 2 has been analyzed in vitro by immersion in simulated body fluid (SBF) at 37°C. XRD, SEM, FTIR and Raman methods were employed to characterize the structural changes occurred on the surface of TiO 2 -CaO-P 2 O 5 samples reacting with SBF. No apatite layer was developed on the samples surfaces but the results point out that the sample containing 0.5 mol% TiO 2 has a greater potential to develop under certain conditions an apatite phase on the surfaces.
2019
Phosphate-based glasses are suitable candidates for biomedical applications due to their porous structure. This study illustrates the properties and structural characterization of titanium-phosphate glass powders in the 55(P2O5)-25(CaO)-(20-x)(Na2O)-x(TiO2), (x= 5, 10, 15) systems, which were prepared via sol-gel method. For this purpose, precursors of P2O5, CaO, Na2O, and TiO2 were added together dropwise on the magnetic stirrer after diluting or dissolving in ethanol. After gel formation, drying was done for various time periods at 60, 120, 180 and 200 °C. The structural and thermal properties of the obtained stabilized sol-gel glass powders were characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FT-IR) spectroscopy, Simultaneous Thermal Analysis (STA), Brunauer-Emmett-Teller surface area, porosity analyzer (BET), and Scanning Electron Microscopy (SEM). The XRD results confirmed the amorphous and glassy nature of the prepared samples. FT-IR Spectroscopy resul...
IOP Conference Series: Materials Science and Engineering, 2016
The possibility of producing phosphate based glasses (PBG) with tailored degradation profile allows for unique utilisation in biomedical application. Various compositions in the phosphate based glass (PBG) system of (50-x)P2O5-40Ca-(5+x)Na-5TiO2 and (50-x)P2O5-40Ca-(5+x)Na-5Fe2O3, where x= 5 and 10 were prepared and characterised. Method as differential scanning calorimetry (DSC) has been used to characterise the thermal properties of these phosphate based glasses. It was observed that both glass transition temperature (Tg) and onset of crystalisatisation temperature (Tx) increased with increasing phosphate content. In addition, Tg values were found to be higher for the P2O5-CaO-Na2O-TiO2 glass system compared to P2O5-CaO-Na2O-Fe2O3 glass system. The density result showed that increasing the P2O5 content at the expense Na2O led to a decrease in density for both glass systems. The dissolution study of these glasses was conducted in phosphate buffered saline (PBS). It was observed that the dissolution rate of P2O5-CaO-Na2O-Fe2O3 glass system was higher than the P2O5-CaO-Na2O-TiO2 glass system. The dissolution rate for both glass systems was in the order of 10-6 g cm-2 hr-1 .
In vivo behavior of bioactive phosphate glass-ceramics from the system P2O5–Na2O–CaO containing TiO2
Journal of Materials Science: Materials in Medicine, 2008
Soda lime phosphate bioglass-ceramics with incorporation of small additions of TiO 2 were prepared in the metaphosphate and pyrophosphate region, using an appropriate two-step heat treatment of controlled crystallization defined by differential thermal analysis results. Identification and quantification of crystalline phases precipitated from the soda lime phosphate glasses were performed using X-ray diffraction analysis. Calcium pyrophosphate (b-Ca 2 P 2 O 7 ), sodium metaphosphate (NaPO 3 ), calcium metaphosphate (b-Ca(PO 3 ) 2 ), sodium pyrophosphate (Na 4 P 2 O 7 ), sodium calcium phosphate (Na 4 Ca(PO 3 ) 6 ) and sodium titanium phosphate (Na 5 Ti(PO 4 ) 3 ) phases were detected in the prepared glass-ceramics. The degradation of the prepared glassceramics were carried out for different periods of time in simulated body fluid at 37°C using granules in the range of (0.300-0.600 mm). The released ions were estimated by atomic absorption spectroscopy and the surface textures were measured by scanning electron microscopy. Evaluation of in vivo bioactivity of the prepared glass-ceramics was carried through implanting the samples in the rabbit femurs. The results showed that the addition of 0.5 TiO 2 mol% enhanced the bioactivity while further increase of the TiO 2 content decreased the bioactivity. The effect of titanium dioxide on the bioactivity was interpreted on the basis of its action on the crystallization process of the glass-ceramics.
Structural characterization of TiO2–P2O5–CaO glasses by spectroscopy
Journal of the European Ceramic Society, 2010
The structure of glasses with composition x TiO 2 •(65 − x) P 2 O 5 •35 CaO (x = 0-30 mol%) has been studied and their glass transition temperature, Raman and NMR spectra have been analysed. For TiO 2-free glass two phosphate species have been identified as Q 2 and Q 3. Increasing TiO 2 content in glass compositions results in the disappearance of the Q 3 and Q 2 species and in the formation of, mainly, pyrophosphate structure, Q 1. In calcium titanophosphate glass with higher TiO 2 content the structure consists of a distorted Ti octahedral linked to pyrophosphate unit through P-O-Ti bonds. In these glass series the structural cohesion increases with TiO 2 , although a depolymerization in the original P-O-P network occurs. The study of these glasses and the understanding of their structural characteristics can give a valuable contribution for the clarification of their degradation behaviour namely in biological environments.
Effects of TiO2-containing phosphate glasses on solubility and in vitro biocompatibility
Journal of Biomedical Materials Research Part A, 2011
Phosphate-based glasses with different amounts of titanium dioxide (TiO 2 ), having the following molar composition 50P 2 O 5 -30CaO-9Na 2 O-3SiO 2 -3MgO-(5-x)K 2 O-xTiO 2 , (where x ¼ 0, 2.5, 5 mol %), were synthesised and characterized in terms of solubility (according to ISO 10993-14), and in vitro biocompatibility using human MG-63 osteoblast cells. Dissolution tests were carried out in Tris-HCl (pH 7.4) to simulate the physiological pH and in citric acid (pH 3.0) to simulate an acidic environment. The weight loss decreased with increasing TiO 2 content, a process further enhanced in acidic medium. TiO 2 reduced the pH changes usually caused by the dissolution products released. Cellular tests showed that all the glasses studied (0-5 mol % TiO 2 ) and TiCl 4 , used to investigate the biocompatibility of titanium ions, did not produce cytotoxic effects on human MG-63 osteoblasts for up to 5 days in culture. On the basis of these results, we suggest that TiO 2 -containing phosphate glasses could be promising substrates for bone tissue engineering applications. V C 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 99A: 295-306, 2011.