The influence of precursor addition order on the porosity of sol–gel bioactive glasses

Fernando, Delihta; Colon, Pierre; Cresswell, Mark; Journet, Catherine; Pradelle-Plasse, Nelly; Jackson, Phil; Grosgogeat, Brigitte; Attik, Nina

doi:10.1016/j.dental.2018.06.003

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…The present system of glasses synthesized with the above starting materials followed the sequence of the addition of SiO 2 : P 2 O 5 : CaO: Pr 2 O 3 . The annealing temperature and catalyst used as described under the experimental section has presented similar results of mesoporous glasses reported in the literature [30]. Sol-gel synthesis involving low temperatures inherently produces porous glass structures in comparison to melt-quenching products, which involves rapid cooling of molten materials [30].…”

Section: Morphological Analysismentioning

confidence: 68%

“…The annealing temperature and catalyst used as described under the experimental section has presented similar results of mesoporous glasses reported in the literature [30]. Sol-gel synthesis involving low temperatures inherently produces porous glass structures in comparison to melt-quenching products, which involves rapid cooling of molten materials [30]. The addition of calcium nitrate could increase the air volume of the pores in the glass material [31].…”

Section: Morphological Analysismentioning

confidence: 71%

“…The surface morphology of the sample coded SPCP1 has a well-defined honeycomb structure, indicating increased porosity and cross linking of polymeric structural units, with increasing concentrations of Pr 3+ . The porosity of glasses could be ascribed to factors such as the precursors, the sequential order of adding the precursors, the annealing temperature, and the catalyst used [30]. The present system of glasses synthesized with the above starting materials followed the sequence of the addition of SiO 2 : P 2 O 5 : CaO: Pr 2 O 3 .…”

Section: Morphological Analysismentioning

confidence: 99%

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Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Gracie

Geetha²,

Battisha³

2023

J. Phys. D: Appl. Phys.

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Silica phosphate glasses strengthened with calcium oxide modifier and doped with different concentrations (0%, 0.5%, 1%, 1.5 mol%) of praseodymium (Pr3+) were synthesized by sol-gel method. The absence of sharp peaks in the x-ray diffraction (XRD) spectra confirms non-crystallinity of the glasses. Higher doping indicates increasing optical band gaps due to Burstein Moss shift, which also reflects on structural disorders at the absorption tails as validated by Urbach’s rule. The density increases with a subsequent decrease in oxygen packing density, proving the mechanical and chemical stability of the glasses. The composite glasses are multifunctional with marked absorption at 280 nm predicting its purpose as UV shielding films. Luminescence corresponding to the intra 4f transition, 〖1_D〗_2→〖1_G〗_4 in the IR region, with high transmission and low reflection losses suggests the use of the synthesized glass material for S-band telecommunications, while the radiative process involving 〖3_P〗_0→〖3_F〗_2 yields a predominant red laser source. Commission International de l’Eclairage (CIE) color coordinates observe warmer red emission corresponding to Correlated Colour Temperature (CCT) of 3200 K. The composite silica phosphate glass systems evidence the effective role of Pr3+ for photonic applications.

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Section: Morphological Analysismentioning

confidence: 68%

Section: Morphological Analysismentioning

confidence: 71%

Section: Morphological Analysismentioning

confidence: 99%

See 1 more Smart Citation

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Gracie

Geetha²,

Battisha³

2023

J. Phys. D: Appl. Phys.

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“…But the extent of agglomeration is lesser which could be related to the smaller intensity of IR vibrations by the absorbed water molecules in the FTIR spectra. Low temperatures involved in the sol-gel synthesis produce mesoporous glasses by the evaporation of the solvent [38]. While significant absorption of water is expected with an increase in pore volume [31], the porosity could be favorably optimized by suitably altering the concentration of calcium oxide in the glass network [38], to augment the density and mechanical stability of the glasses.…”

Section: Compositional Analysismentioning

confidence: 99%

Structural and optical investigations of RE³⁺: Yb, Er, Sm, Nd, Ce-doped multi-functional silica glasses for photonic applications

Yasmin,

Geetha

2024

J. Phys. D: Appl. Phys.

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The influence of various trivalent lanthanides was investigated in the silica phosphate multi-component glass matrix, synthesized by the sol-gel method. The prepared glasses were analyzed to explore the degree of bandwidth amplification for telecommunication systems, and the potentiality of lasing media and smart glass films. Alkaline earth metal ions of Ca2+ were effectuated as a glass modifier, mediating the formation of non-bridging oxygen with the glass formers, and imputing favorable structural attributes to the glasses for versatile applications. The bonding parameter derived from the average nephelauxetic ratio implies covalency around the rare earth ion sites in the Er3+ and Nd3+ doped systems, while the Sm3+ doped glass exhibits ionicity. In the silica-based glass matrix singly doped with Yb3+, the coexistence of Yb3+/ Yb2+ ions was evidenced. Transitions across 4f14 and 4f135d levels of Yb2+, with an experimental lifetime of 45.8 ns would provide prospective pulsed yellow lasers, for non-invasive therapeutics. Er3+ doped glass evinced a large bandwidth of 93.775 nm at 1477 nm and a high quantum efficiency of 97%, favorable for O+E+S-band telecommunication networks. The transition corresponding to 4G_(5/2)→6H_(7/2) of Sm3+ and 2G_(7/2)→4I_(9/2) of Nd3+ is suggestive that the respective doped glasses could be devised into solid-state red and green laser sources. Novel NIR emission at 1476 nm was also evidenced in the Sm3+ and Nd3+ doped systems. Prominent absorption at 280 nm and complete transparency in the visible region observed in the Ce3+ mono-doped system make it ideal for smart glasses as UVB and UVC shielding films.

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“…Also, can be attributed to oleic acid can clog pores by increasing the hydrophobicity in the filled pores which contribute to a reduction in the electrolyte diffusion to the surface of the substrate [76], [77]. In common issue with many sol-gels formulas, the drawback of using the SBX sol-gel alone is porosity [100], [163], [164], leading to ionic and electrolytic diffusion to the metal surface, which will make the sol-gel coating less durable if it is used as a single layer coating system without the presence of inhibitors. Therefore, enhancement was attempted to the base SBX-80 sol-gel coating by adding an organic corrosion inhibitor, benzimidazole (BZI).…”

Section: Potentiodynamic Polarization Scanning (Pdps)mentioning

confidence: 99%

Development of Hybrid Sol-Gel Coatings on AA2024-T3 with Environmentally Benign Corrosion Inhibitors

Mussa¹

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Aluminium alloys are still considered as one of the primary light alloys with high strength that can be used in aerospace and marine structure with a moderate economic cost. However, aluminium alloys are affected by atmospheric and marine corrosion which reduces their overall reliability. The application of coatings is one of the strategies for mitigating the corrosion on aluminium alloys. Sol-gel technology is one of the coating strategies with potential for excellent chemical and environment stability, providing eco-friendly performance improvement. Sol-gel coatings can enhance corrosion resistance by adopting many corrosion inhibitors that can protect aluminium alloys substrates from corrosion.

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The influence of precursor addition order on the porosity of sol–gel bioactive glasses

Cited by 12 publications

References 28 publications

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Structural and optical investigations of RE³⁺: Yb, Er, Sm, Nd, Ce-doped multi-functional silica glasses for photonic applications

Development of Hybrid Sol-Gel Coatings on AA2024-T3 with Environmentally Benign Corrosion Inhibitors

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The influence of precursor addition order on the porosity of sol–gel bioactive glasses

Cited by 12 publications

References 28 publications

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Multifunctional praseodymium-doped composite silica glasses for UV shielding and photonic applications

Structural and optical investigations of RE3+: Yb, Er, Sm, Nd, Ce-doped multi-functional silica glasses for photonic applications

Development of Hybrid Sol-Gel Coatings on AA2024-T3 with Environmentally Benign Corrosion Inhibitors

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Product

Resources

About

Structural and optical investigations of RE³⁺: Yb, Er, Sm, Nd, Ce-doped multi-functional silica glasses for photonic applications