Results 91 to 100 of about 329 (124)

Proton conduction of in-situ formed Cs2H5(SO4)2(PO4) within phosphosilicate gel

Solid State Ionics, 2012
Abstract Thermal behavior and a mechanism of the proton conduction were investigated for a composite with an in-situ formed Cs2H5(SO4)2(PO4) and a phophosilicate gel. The raw material compositions investigated were 0.4CsHSO4 − xP2O5−(0.6 − x)SiO2 with x = 0.20, 0.25, and 0.30.
Shuichi Arakawa
exaly   +2 more sources

Comparison of structure and proton conductivity of phosphosilicate gels derived from several kinds of phosphorus-containing compounds

Solid State Ionics, 2001
Abstract Proton conductive phosphosilicate gels have been prepared from tetraethoxysilane (TEOS) and various kinds of phosphorus-containing compounds such as orthophosphoric acid (H3PO4), triethylphosphate (PO(OEt)3) and 2-(diethoxyphosphoryl)ethyltriethoxysilane (DPTS) by the sol–gel method.
Masahiro Tatsumisago, Atsunori Matsuda
exaly   +2 more sources

Proton conductivity and structure of phosphosilicate gels derived from tetraethoxysilane and phosphoric acid or triethylphosphate

Solid State Ionics, 2001
Abstract Changes in proton conductivities of phosphosilicate gels derived from tetraethoxysilane and phosphoric acid or triethylphosphate have been discussed on the basis of the structural changes in the gels with the heat treatment. Proton conductivities of both phosphosilicate gels increased with an increase in relative humidity, indicating that ...
Masahiro Tatsumisago, Atsunori Matsuda, Yoshinori Kotani   +2 more
exaly   +2 more sources

Chemical heterogeneity in phosphosilicate gels by NMR magnetisation exchange

Journal of the Chemical Society, Dalton Transactions, 2001
Nanometre scale chemical heterogeneity has been revealed in a phosphosilicate gel by 31P spin exchange. Monomeric phosphorus was found near to phosphorus singly cross-linked with phosphorus. Phosphorus doubly cross-linked with phosphorus was found to be remote from both other types of phosphorus species.
CLAYDEN, NIGEL J., ESPOSITO, SERENA, ARONNE, ANTONIO, ANTONIO   +4 more
openaire   +5 more sources

Formation of functional phosphosilicate gels from phytic acid and tetraethyl orthosilicate [PDF]

Journal of Sol-Gel Science and Technology, 2008
Phosphosilicate gels with high phosphorus content (P mol% > Si mol%) have been prepared using phytic acid as the phosphorus precursor, with tetraethyl orthosilicate (TEOS). It is shown that the structure of phytic acid is maintained in both the sols and those gels dried at a low temperature (i.e.
Qiu, Dong, Guerry, Paul, Knowles, Jonathan C., Smith, Mark E., Newport, Robert J.   +4 more
openaire   +1 more source

Microstructural evolution of sol-gel-derived phosphosilicate gel with heat treatment

Journal of Materials Science, 1994
The microstructure of phosphosilicate gel prepared by a sol-gel process was investigated as a function of the heat-treatment temperature. Crystalline phases, Si3(PO4)4 and SiP2O7, were identified in the heat-treated phosphosilicate gel containing 56 mol% P2O5.
Y. S. Kim, R. E. Tressler
openaire   +1 more source

Solid state NMR study of phosphosilicate gels

Journal of Non-Crystalline Solids, 2004
Solid state Si-29, P-31 and H-1 MAS-NMR were used to investigate structural aspects of gel-derived glasses of molar composition 10P(2)O(5).90SiO(2) (10P) and 30P(2)O(5) . 70SiO(2) (30P). P-31 MAS-NMR spectra of the 10P and 30P gels dried at 100degreesC show resonances characteristic of orthophosphoric and pyrophosphoric acid.
CLAYDEN N. J., ARONNE, ANTONIO, ESPOSITO S., PERNICE, PASQUALE   +3 more
openaire   +5 more sources

Structural characterization of some sol–gel derived phosphosilicate glasses

Journal of Molecular Structure, 2015
Abstract A comparative study of three phosphosilicate gels of the 90SiO 2 –10P 2 O 5 composition obtained from tetraethoxysilane and three phosphorous precursors: triethylphosphate (TEP), triethylphosphite (TEPI) and H 3 PO 4 is performed. 29 Si and 31 P Magic Angle Spining NMR, X-ray Photoelectron, X-ray Fluorescence and Raman spectroscopies as ...
L. Todan, E.M. Anghel, P. Osiceanu, R.V.F. Turcu, I. Atkinson, S. Simon, M. Zaharescu   +6 more
openaire   +1 more source

Phenyl-modified phosphosilicate gels for proton conductivity

2023
Proton (H+) transport in membranes and solid electrolytes leads to their potential use in fuel cells and chemical sensors. Phenyl and zirconia modified phosphosilicate gels were successfully synthesized and demonstrate interesting properties that suggest that these materials have future use as proton conductors.
openaire   +1 more source

Phosphosilicate glass film for optical waveguide by sol-gel method

Optoelectronics Letters, 2005
In this paper, silica-on-silicon erbium-doped phosphosilicate glass film material was fabricated for optical waveguides by sol-gel method. Samples were characterized and analyzed. It is demonstrated that we have got-distributed, good translucent, alterable thickness of film and glass state erbiumdoped phosphosilicate films materials for optical ...
Jian Shen, Ai-wu Li, Jie Zheng, Le-tian Zhang, Guo-fan Liu, Wei Zheng, Yu-shu Zhang   +6 more
openaire   +1 more source