Results 81 to 90 of about 329 (124)
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Thermal evolution of sol–gel-obtained phosphosilicate solids (SiPO)
Journal of Non-Crystalline Solids, 2001Abstract Amorphous phosphosilicate solid with P–O–Si linkages was obtained by a sol–gel process starting from tetraethoxysilane (TEOS) and H 3 PO 4 . The evolution of the structure of as-prepared gel was investigated as a function of the heat-treatment temperatures, by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), diffuse ...
I Carrizosa, J A Odriozola
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Preparation of proton conductive composites with CsHSO4/CsH2PO4 and phosphosilicate gel
Solid State Ionics, 2006Abstract New composite materials were prepared using cesium hydrogen sulfate (CsHSO 4 ) or cesium dihydrogen phosphate (CsH 2 PO 4 ) and phosphosilicate gel (P 2 O 5 –SiO 2 gel). In X-ray diffraction patterns of these composites, diffraction peaks due to Cs 2 H 5 (SO 4 ) 2 (PO 4 ) and CsH 5 (PO 4 ) 2 were observed for CsHSO 4 –(P 2 O 5 –SiO 2 gel)
Akitoshi Hayashi, Kiyoharu Tadanaga
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Phosphosilicate gel-polybenzimidazole nanocomposite novel membrane for fuel cell application
International Journal of Plastics Technology, 2014Phosphosilicate gel-Polybenzimidazole (PBI) nanocomposite electrolyte membranes are synthesised, characterized and tested for fuel cell performance. The chemical structure of both phosphosilicate gel and PBI are confirmed by Fourier transform infrared spectroscopy.
Kajari Kargupta +2 more
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Performance enhancement of phosphoric acid fuel cell by using phosphosilicate gel based electrolyte
Journal of Fuel Chemistry and Technology, 2012Abstract Replacement of phosphoric acid electrolyte by phosphosilicate gel based electrolytes is proposed to enhance the performance of phosphoric acid fuel cell (PAFC). Phosphosilicate gels in paste form and in powder form are synthesized from tetraethoxysilane and orthophosphoric acid by using sol-gel method, for two different P/Si ratios of 5 and 1.
Kajari Kargupta +2 more
exaly +3 more sources
Solid state 29Si and 31P NMR study of gel derived phosphosilicate glasses
Journal of Materials Chemistry, 2001Solid state 29Si and 31P MAS NMR have been used to investigate the microstructural changes occurring in phosphosilicate gels during their conversion from a gel to the corresponding gel-derived glasses by heating. The studied gels have the molar compositions 10P2O5·90SiO2 and 30P2O5·70SiO2.
Nigel Clayden +2 more
exaly +9 more sources
3D printed Er3+/Yb3+ co-doped phosphosilicate glass based on sol-gel technology
Journal of Non-Crystalline Solids, 2020Abstract We demonstrate a method to manufacture Er3+/Yb3+ co-doped phosphosilicate glass by the digital light processing (DLP) 3D printing based on sol-gel technology. The sol-gel technology was used to fabricate the rare earth ions doped photocurable printing ink to achieve excellent fluidity, tunable composition and uniform component distribution ...
Jinhang Wang, Baoluo Zheng, Pu Wang
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Preparation of proton conductive composites with cesium hydrogen sulfate and phosphosilicate gel
Solid State Ionics, 2005Abstract We prepared a new composite material composed of cesium hydrosulfate (CsHSO 4 ) and phosphosilicate gel (P 2 O 5 –SiO 2 gel); a high temperature form of the former exhibits exceptionally high proton conductivity at above 144 °C without humidification and the latter is one of the high proton conductors working under low humidity in a ...
Akitoshi Hayashi +2 more
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Solid State Ionics, 2003
Abstract Thermally stable proton-conducting composite sheets of 50–100 μm thick have been prepared from phosphosilicate gel (P/Si=1 molar ratio) powders and polyimide precursor. The proton conductivity of the composite sheet increased with an increase in the phosphosilicate gel content.
Kiyoharu Tadanaga +2 more
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Abstract Thermally stable proton-conducting composite sheets of 50–100 μm thick have been prepared from phosphosilicate gel (P/Si=1 molar ratio) powders and polyimide precursor. The proton conductivity of the composite sheet increased with an increase in the phosphosilicate gel content.
Kiyoharu Tadanaga +2 more
exaly +2 more sources
2005
Composite xerogels based on a phosphosilicate matrix filled with nanodiamonds were synthesized by sol-gel processing. The crystalline and fractal characteristics of the initial nanopowders were obtained using wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) techniques.
Olga Shilova, V V Shilov
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Composite xerogels based on a phosphosilicate matrix filled with nanodiamonds were synthesized by sol-gel processing. The crystalline and fractal characteristics of the initial nanopowders were obtained using wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) techniques.
Olga Shilova, V V Shilov
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Stress in thick sol-gel phosphosilicate glass films formed on Si substrates
Journal of Non-Crystalline Solids, 1994Abstract It is shown that thick (> 10 μm) films of phosphosilicate glass may be formed on silicon substrates by repetitive spin-coating and rapid thermal annealing of commercial sol-gel material. The viability of the process is explained in terms of film stresses, and it is demonstrated that annealing above a critical temperature is necessary to ...
R R A Syms
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