ChemInform Abstract: THERMAL EXPANSION AND CHEMICAL DURABILITY OF PHOSPHATE GLASSES

Minami, Tatsuo; MacKenzie, J. D.

doi:10.1002/chin.197737008

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“…Moreover the break-down components can be easily metabolised in the body and their solubility can be controlled by varying its chemical composition [3,4]. In recent years, there has been several papers on improving the physical properties and chemical durability of the phosphate glasses by adding different metal oxides with high valency cations such as Ti 4+ , Fe 3+ , etc., because of the formation of relatively stable cross-linked bonds in the phosphate network [5,6]. Quaternary phosphate-based glasses of the general formula P 2 O 5 -CaO-Na 2 O-TiO 2 (PCNT) have been prepared via melt-quench methods for biomedical application purposes [7].…”

Section: Introductionmentioning

confidence: 99%

Novel sol–gel preparation of (P2O5)0.4–(CaO)0.25–(Na2O)X–(TiO2)(0.35−X) bioresorbable glasses (X = 0.05, 0.1, and 0.15)

Foroutan

Leeuw

Martin

et al. 2014

J Sol-Gel Sci Technol

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Quaternary phosphate-based glasses in the P 2 O 5 -CaO-Na 2 O-TiO 2 system with a fixed P 2 O 5 and CaO content of 40 and 25 mol% respectively have been successfully synthesised via sol-gel method and bulk, transparent samples were obtained. The structure, elemental proportion, and thermal properties of stabilised solgel glasses have been characterised using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), 31 P nuclear magnetic resonance ( 31 P NMR), titanium K-edge X-ray absorption near-edge structure (XANES), fourier transform infrared (FTIR) spectroscopy, and differential thermal analysis (DTA). The XRD results confirmed the amorphous nature for all stabilized sol-gel derived glasses. The EDX result shows the relatively low loss of phosphorus during the sol-gel process and Ti K-edge XANES confirmed titanium in the glass structure is in mainly sixfold coordination environment. The 31 P NMR and FTIR results revealed that the glass structure consist of mainly Q 1 and Q 2 phosphate units and the Ti 4+ cation was acting as a cross-linking between phosphate units. In addition DTA results confirmed a decrease in the glass transition and crystallisation temperature with increasing Na 2 O content. Ion release studies also demonstrated a decrease in degradation rates with increasing TiO 2 content therefore supporting the use of these glasses for biomedical applications that require a degree of control over glass degradation. These sol-gel glasses also offer the potential to incorporate proactive molecules for drug delivery application due to the low synthesis temperature employed.

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Section: Introductionmentioning

confidence: 99%

Novel sol–gel preparation of (P2O5)0.4–(CaO)0.25–(Na2O)X–(TiO2)(0.35−X) bioresorbable glasses (X = 0.05, 0.1, and 0.15)

Foroutan

Leeuw

Martin

et al. 2014

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

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ChemInform Abstract: THERMAL EXPANSION AND CHEMICAL DURABILITY OF PHOSPHATE GLASSES

Abstract: Die thermischen Ausdehnungskoeffizienten sowie die Auflösungsgeschwindigkeiten für Alkaliphosphatgläser der Typen (I) und (II) mit Al2O3 und/oder WO3 als dritter bzw. vierter Komponente werden gemessen.

Cited by 1 publication

References 1 publication

Novel sol–gel preparation of (P2O5)0.4–(CaO)0.25–(Na2O)X–(TiO2)(0.35−X) bioresorbable glasses (X = 0.05, 0.1, and 0.15)

Novel sol–gel preparation of (P2O5)0.4–(CaO)0.25–(Na2O)X–(TiO2)(0.35−X) bioresorbable glasses (X = 0.05, 0.1, and 0.15)

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