Peculiarities of formation of phase composition, porous structure, and catalytic properties of tungsten oxide-based macroporous materials fabricated by sol–gel synthesis

2014 ◽  
Vol 88 ◽  
pp. 42-51 ◽  
Author(s):  
Evgeniy Konstantinovich Papynov ◽  
Vitaliy Yurevich Mayorov ◽  
Marina Sergeevna Palamarchuk ◽  
Valentin Aleksandrovich Avramenko
Keyword(s):  
Phase Composition ◽  
Porous Structure ◽  
Tungsten Oxide ◽  
Catalytic Properties ◽  
Sol Gel ◽  
Macroporous Materials ◽  
Sol Gel Synthesis

scholarly journals Ga-Substituted Cobalt-Chromium Spinels as Ceramic Pigments Produced by Sol–Gel Synthesis

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1078
Author(s):  
Egle Grazenaite ◽  
Edita Garskaite ◽  
Zivile Stankeviciute ◽  
Eva Raudonyte-Svirbutaviciene ◽  
Aleksej Zarkov ◽  
...  
Keyword(s):  
Phase Composition ◽  
Crystallite Size ◽  
Single Phase ◽  
Sol Gel ◽  
Ceramic Pigments ◽  
Blue Color ◽  
Cobalt Chromium ◽  
Light Blue ◽  
Sol Gel Synthesis ◽  
First Time

For the first time to the best of our knowledge, cobalt-chromium spinels CoCr2−xGaxO4 with different amounts of gallium (x = 0–2 with a step of 0.5) were synthesized via the aqueous sol–gel route as ceramic pigments. The phase composition, crystallite size, morphological features, and color parameters of new compositions and their corresponding ceramic glazes were investigated using XRD, CIELab, SEM, and optical microscopy. It was demonstrated that the formation of single-phase CoCr2−xGaxO4 samples was problematic. Full substitution of Cr3+ by Ga3+ ion in the spinel resulted in the formation of light blue powders, which yielded violetish blue color for the corresponding ceramic glaze.

Morphology and Phase Composition of Sol-Gel Derived Aluminum Borate Nanowhiskers

2015 ◽  
Vol 659 ◽  
pp. 121-126 ◽  
Author(s):  
Pat Sooksaen
Keyword(s):  
Fourier Transform ◽  
Phase Composition ◽  
Sol Gel ◽  
Molar Ratio ◽  
Aluminum Borate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Higher Temperature ◽  
Sol Gel Synthesis ◽  
Scanning Electron

Aluminium borate nanowhiskers with varying aspect ratio were synthesized via sol–gel synthesis. The morphology of aluminum borate (Al4B2O9 and Al18B4O33) nanowhiskers could be controlled by varying the aluminum to boron (Al:B) molar ratio in the sol–gel derived precursors. Sintering temperatures (850 and 1100°C) and sintering times (4 and 32 hours) also affected the phase composition and size of the nanowhiskers. Citric acid was also added in the sol–gel derived precursors as a surface stabilizer for obtaining uniform finely dispersed nanostructures. Fine nanowhiskers were obtained by the calcination at 850°C, whereas higher temperature of 1100°C led to thicker and longer nanowhiskers and became rod-like crystals. The morphology and phase composition were investigated by field emission scanning electron microscope and X-ray diffraction. Chemical bond vibrations in the synthesized nanowhiskers were investigated by Fourier-transform infrared spectroscopy.

Tantalum–tungsten oxide thermite composites prepared by sol–gel synthesis and spark plasma sintering

2010 ◽  
Vol 157 (8) ◽  
pp. 1566-1571 ◽  
Author(s):  
Joshua D. Kuntz ◽  
Octavio G. Cervantes ◽  
Alexander E. Gash ◽  
Zuhair A. Munir
Keyword(s):  
Tungsten Oxide ◽  
Spark Plasma Sintering ◽  
Sol Gel ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sol Gel Synthesis

Sol–gel synthesis and enhanced photocatalytic activity of doped bismuth tungsten oxide composite

2016 ◽  
Vol 73 ◽  
pp. 385-393 ◽  
Author(s):  
Xuetang Xu ◽  
Yuanxing Ge ◽  
Hong Wang ◽  
Bin Li ◽  
Liuhui Yu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Tungsten Oxide ◽  
Sol Gel ◽  
Oxide Composite ◽  
Sol Gel Synthesis

Non-aqueous sol–gel synthesis, characterization and catalytic properties of metal fluoride supported palladium nanoparticles

2008 ◽  
Vol 78 (1-2) ◽  
pp. 80-91 ◽  
Author(s):  
Pratap T. Patil ◽  
Anton Dimitrov ◽  
Holm Kirmse ◽  
Wolfgang Neumann ◽  
Erhard Kemnitz
Keyword(s):  
Palladium Nanoparticles ◽  
Catalytic Properties ◽  
Sol Gel ◽  
Metal Fluoride ◽  
Supported Palladium ◽  
Sol Gel Synthesis

scholarly journals SOL-GEL SYNTHESIS AND CATALYTIC PROPERTIES OF VANADIUM PHOSPHATES BULK MATERIALS

2000 ◽  
Vol 11 (0) ◽  
pp. 87-93 ◽  
Author(s):  
S. A. Ennaciri ◽  
K. Malka ◽  
C. Louis ◽  
P. Barboux ◽  
C. R'kha ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Sol Gel ◽  
Bulk Materials ◽  
Vanadium Phosphates ◽  
Sol Gel Synthesis

scholarly journals Sol-gel synthesis and structure of La2O3-CoO-SiO2 powders

2008 ◽  
Vol 2 (2) ◽  
pp. 103-108 ◽  
Author(s):  
Lachezar Radev ◽  
Liliana Pavlova ◽  
Bisserka Samuneva ◽  
Elena Kashchieva ◽  
Irena Mihailova ◽  
...  
Keyword(s):  
Chelating Agents ◽  
Catalytic Properties ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Solution Crystallization ◽  
Metal Nitrates ◽  
Crystallite Sizes ◽  
Solgel Method ◽  
Sol Gel Synthesis ◽  
Reaction In Solution

LaCoO3 powders are studied because they exhibit interesting electrical, magnetic and catalytic properties. In this paper, new synthesized La2O3-CoO-SiO2 powders with different quantity of silica were prepared via solgel method in aqua media, starting from metal nitrates with different chelating agents. The relation between the reaction in solution, crystallization pathway and morphology were discussed. In LaCoO3-SiO2 powders, depending on the content of SiO2 and the treatment temperature (700-1100?C), different crystalline phases (LaCoO3, Co2 SiO4 and La9.31 (SiO4 )6 O2) were observed with the crystallite sizes ranging from 50 to 100 nm. It was proved that chemical composition and nature of used additives has influence on the phase formation and structure of obtained nanomaterials.

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