Metal Complexes in Inorganic Matrixes. 11. Composition of Highly Dispersed Bimetallic Ni, Pd Alloy Particles Prepared by Sol-Gel Processing: Electron Microscopy and FMR Study

1994 ◽  
Vol 6 (10) ◽  
pp. 1659-1666 ◽  
Author(s):  
Wolfgang Moerke ◽  
Ryszard Lamber ◽  
Ulrich Schubert ◽  
Boris Breitscheidel
Keyword(s):  
Electron Microscopy ◽  
Metal Complexes ◽  
Sol Gel ◽  
Alloy Particles ◽  
Highly Dispersed ◽  
Pd Alloy ◽  
Gel Processing

Nanosized Metal Particles by Control of the Metal Dispersion During Sol-Gel Processing

1994 ◽  
Vol 351 ◽  
Author(s):  
Ulric Schubert ◽  
Claus Görsmann ◽  
Stefan Tewinkel ◽  
Andreas Kaiser ◽  
Thomas Heinrich
Keyword(s):  
Metal Complexes ◽  
Sol Gel ◽  
Metal Particles ◽  
Metal Dispersion ◽  
Bimetallic Particles ◽  
Highly Dispersed ◽  
Gel Processing

ABSTRACTThe previously developed method to prepare highly dispersed metals in SiO2 by sol-gel processing of metal complexes containing alkoxysilyl-substituted ligands was extended to the preparation (i) of bimetallic particles in SiO2 and (ii) of highly dispersed metals in TiO2.

Highly dispersed nickel and palladium nanoparticle silica aerogels: sol–gel processing of tethered metal complexes and application as catalysts in the Mizoroki–Heck reaction

2006 ◽  
Vol 30 (7) ◽  
pp. 1093-1097 ◽  
Author(s):  
Sandra Martínez ◽  
Marcial Moreno-Mañas ◽  
Adelina Vallribera ◽  
Ulrich Schubert ◽  
Anna Roig ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Heck Reaction ◽  
Sol Gel ◽  
Silica Aerogels ◽  
Palladium Nanoparticle ◽  
Highly Dispersed ◽  
Gel Processing

scholarly journals Metallkomplexe in Anorganischen Matrices, 5 [1] / Metal Complexes in Inorganic Matrices, 5 [1]

1991 ◽  
Vol 46 (6) ◽  
pp. 783-788 ◽  
Author(s):  
Christian Egger ◽  
Ulrich Schubert
Keyword(s):  
Acetic Acid ◽  
Metal Complexes ◽  
Phenylacetic Acid ◽  
Sol Gel ◽  
Rhodium Complex ◽  
Gel Processing ◽  
Inorganic Matrices

A heterogenized rhodium complex, prepared by sol-gel processing of Rh(CO)Cl[PPh2CH2CH2Si(OEt)3]2 and Si(OEt)4, is shown to catalyze the conversion of the silanes H4-nSiPh„ (n = 1 - 3) or (HMe2Si)2O to (poly)siloxanes by air or water. Using THF as a solvent, the silanoles Ph3SiOH or Ph2Si(OH)2 are obtained instead. The reaction of phenylacetic acid or acetic acid with HSiPh3 to give silyl esters is catalyzed by the same compound.

Grain growth and sintering in Bi–(Pb)—Sr—Ca—Cu—O superconductors made by sol-gel

1994 ◽  
Vol 9 (2) ◽  
pp. 286-291 ◽  
Author(s):  
Kunsong Ma ◽  
Alain C. Pierre
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Citric Acid ◽  
Grain Growth ◽  
Sol Gel ◽  
Gel Processing ◽  
Scanning Electron

Bi—(Pb)—Sr—Ca—Cu—O superconductors were synthesized by sol-gel processing from nitrates by complexation with citric acid. Their grain growth and sintering above 800 °C were studied by Scanning Electron Microscopy (SEM) and Brunauer, Emmett, Teller (BET) porosimetry. The sintering was limited by anisotropic grain growth, and microcracks in 2212 phase grains were created due to the formation of 2223 phase.

Sol-gel processing of nanocrystalline haematite thin films

1997 ◽  
Vol 12 (6) ◽  
pp. 1441-1444 ◽  
Author(s):  
L. Armelao ◽  
A. Armigliato ◽  
R. Bozio ◽  
P. Colombo
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Raman Spectroscopy ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Single Particles ◽  
X Ray ◽  
Transmission Electron ◽  
Gel Processing

The microstructure of Fe2O3 sol-gel thin films, obtained from Fe(OCH2CH3)3, was investigated by x-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. Samples were nanocrystalline from 400 °C to 1000 °C, and the crystallized phase was haematite. In the coatings, the α–Fe2O3 clusters were dispersed as single particles in a network of amorphous ferric oxide.

Gel-derived amorphous cesium-aluminosilicate powders useful for formation of pollucite glass-ceramics

1991 ◽  
Vol 6 (2) ◽  
pp. 217-219 ◽  
Author(s):  
Mari A. Hogan ◽  
Subhash H. Risbud
Keyword(s):  
Electron Microscopy ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Amorphous Powder ◽  
Glass Crystallization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Powders ◽  
Gel Processing ◽  
Scanning Electron

Amorphous powders in the Cs2O–Al2O3−SiO2 system were prepared by sol-gel processing. Gels made from TEOS, Al-chelate, and Cs-acetate were dried and calcined to obtain molecularly mixed powders of analyzed compositions in the range useful for conversion to pollucite (CsAlSi2O6) glass-ceramics. X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetry (TG), and scanning electron microscopy (SEM) were used to characterize the powders. A typical amorphous powder of analyzed chemical composition (in wt.%) = 28.05Cs2O, 37.77SiO2, and 37.96Al2O3 was found to have a glass transition temperature of 945 °C and a glass crystallization temperature of 1026 °C. Preliminary experimental results of densification and crystallization of the amorphous powders show pollucite/mullite phases to be present.

Synthesis of Nano-Sized SrTiO3 Photocatalyst by Sol-Gel Method

2012 ◽  
Vol 512-515 ◽  
pp. 1673-1676 ◽  
Author(s):  
Wei Zhao ◽  
Jian Jun Yao ◽  
Jing Ya ◽  
Lei E ◽  
Zhi Feng Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Complexing Agent ◽  
Strontium Nitrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Gel Processing

A sol-gel processing technology was employed to synthesize fine SrTiO3 powder by using strontium nitrate (Sr(NO3)2) , butyl titanate (Ti(OC4H9)4) as precursors, citric acid (C6H8O6) as complexing agent and (ethylene) glycol (C2H6O2) as stabilizer. Prepared the precursors in liquid phase and then calcined the precursors to achieve nano-sized SrTiO3 powders. The microstructure and composition of the as-synthesized samples were characterized by X-ray diffraction (XRD), Scan Electron Microscopy (SEM), and the photocatalytic activity was studied. The results showed that all the SrTiO3 particles were identified as perovskite phase. The pH values, the content of the acetic acid, the heat treat temperature play important roles on the synthesis of the SrTiO3 photocatalyst. When the pH=1, n(Sr(NO3)2 ) : n(Ti(OC4H9)4) = 1 : 1, n(Sr(NO3)2 ) : n(C6H8O6)=1:1.7, the product has better rate of photodegradation for the Methylene Blue under the ultraviolet condition.

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