The effect of production regime and crucible materials on the thermal properties of sodium phosphate glasses produced from salts

AbstractPhosphate glasses are novel amorphous biomaterials due to their fully resorbable characteristics, with controllable degradation profiles. In this study, phosphate glasses containing titanium and/or iron were identified to exhibit sufficiently matched thermal properties (glass transition temperature, thermal expansion coefficient and viscosity) which enabled successful co-extrusion of glass billets to form a core/clad preform. The cladding composition for the core/clad preforms were also reversed. Fe clad and Ti clad fibres were successfully drawn with an average diameter of between 30~50 μm. The average cladding annular thickness was estimated to be less than 2 μm. Annealed core/clad fibres were degraded in PBS for a period of 27 days. The strength of the Fe clad fibres appeared to increase from 303 ± 73 MPa to 386 ± 45 MPa after nearly 2 weeks in the dissolution medium (phosphate buffered solution) before decreasing by day 27. The strength of the Ti clad fibres revealed an increase from 236 ± 53 MPa to 295 ± 61 MPa when compared at week 3. The tensile modulus measured for both core/clad fibres ranged between 51 GPa to 60 GPa. During the dissolution study, Fe clad fibres showed a peeling mechanism compared to the Ti clad fibres.

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Thermal, chemical and structural characteristics of erbium-doped sodium phosphate glasses

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2003.11.016 ◽

2004 ◽

Vol 84 (1) ◽

pp. 151-156 ◽

Cited By ~ 52

Author(s):

P.Y Shih

Keyword(s):

Sodium Phosphate ◽

Structural Characteristics ◽

Phosphate Glasses ◽

Erbium Doped

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Thermal properties of Na2O–P2O5–Fe2O3 polyphosphate glasses

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-020-09476-3 ◽

2020 ◽

Vol 142 (1) ◽

pp. 203-209 ◽

Cited By ~ 1

Author(s):

Paweł Goj ◽

Małgorzata Ciecińska ◽

Magdalena Szumera ◽

Paweł Stoch

Keyword(s):

Thermal Properties ◽

Phosphate Glass ◽

Transformation Temperature ◽

Glass Network ◽

Iron Phosphate ◽

Phosphate Glasses ◽

Continuous Change ◽

Glass Transformation ◽

Immobilization Techniques ◽

Iron Phosphate Glasses

Abstract Iron phosphate glasses are materials that can have many applications like durable matrixes in waste immobilization techniques, biomaterials, optoelectronic devices, etc. Their possible usage is related to their glass network and thermal properties. The influence of Na2O content on thermal properties and crystallization ability of iron phosphate glass of base composition 30 Fe2O3–70 P2O5 mol% were studied. Increasing the content of Na2O causes a decrease in transformation temperature and increase in ΔCp. Characteristic temperatures, thermal stability and crystallizing phases were determined. Increasing content of sodium causes depolarization of iron phosphate glass network which causes a continuous change in ΔCp and glass transformation temperature. Discontinuous change in some glass properties suggests structure rebuilding about 30 mol% of Na2O.

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