Nanosized platinum particles by sol-gel processing of tethered metal complexes: influence of the precursors and the organic group removal method on the particle size

1998 ◽  
Vol 22 (7) ◽  
pp. 721-724 ◽  
Author(s):  
Christian Lembacher ◽  
Ulrich Schubert
Keyword(s):  
Particle Size ◽  
Metal Complexes ◽  
Sol Gel ◽  
Organic Group ◽  
Removal Method ◽  
Platinum Particles ◽  
Gel Processing

Metal Complexes in Oxidic Matrices

1992 ◽  
Vol 271 ◽  
Author(s):  
Ulrich Schubert ◽  
Boris Breitscheidel ◽  
Hermann Buhler ◽  
Christian Egger ◽  
Wlodzimierz Urbaniak
Keyword(s):  
Metal Complex ◽  
Metal Complexes ◽  
Sol Gel ◽  
Ceramic Matrix ◽  
Metal Particles ◽  
Homogeneous Catalysts ◽  
Organic Group ◽  
Catalytically Active ◽  
Group A ◽  
Gel Processing

ABSTRACTAlkoxides of the type (RO)nE-X-A in which a functional organic group A is connected to the alkoxide moiety via an inert and hydrolytically stable spacer X, are used to bind metal complex moieties. Sol-gel processing of the resulting metal complexes [(RO)nE-X-A]yMIm under standard conditions results in the formation of metal complex containing gels. If the metal complex moiety MLm is catalytically active, this method results in the heterogenization of homogeneous catalysts. Another application of the metal complex substituted gels is the preparation of composites containing uniform, nanometer-sized metal particles homogeneously dispersed in a ceramic matrix.

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.

Modified Sol-Gel Processing of NiCr2O4 Nanoparticles; Structural Analysis and Optical Band Gap

2017 ◽  
Vol 36 (2) ◽  
pp. 121-125 ◽  
Author(s):  
Morteza Enhessari ◽  
Ali Salehabadi ◽  
Salah Khanahmadzadeh ◽  
Kamal Arkat ◽  
Jalal Nouri
Keyword(s):  
Particle Size ◽  
Band Gap ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Complexing Agent ◽  
Minor Phase ◽  
Absorption Bands ◽  
Ammonium Dichromate ◽  
Electrical Devices ◽  
Gel Processing

AbstractNickel Chromite nanoparticles were successfully synthesized via a modified sol-gel method using nickel acetate and ammonium dichromate in melted stearic acid as a complexing agent. The diffractograms of the nanoparticles confirmed a pure formation of NiCr2O4 spinel without any minor phase. The coordination structure of as prepared nanoparticles shows a series of absorption bands below 1,000 cm−1 were evidenced the M-O (Cr-O, Ni-O) bond in the sample. Optical band gap, magnetic properties and color parameters (L*.a*.b*) indicates that the final nanoparticles are optically and magnetically active. The particle size of NiCr2O4 was calculated using Scherrer equation at about 24 nm. Optical band gap obtained at 1.7 eV indicating that NiCr2O4 nanoparticles are semiconductor material and can be used in electrical devices.

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.

Fabrication of Ferromagnetic Fe/Mullite Composite Materials Via Sol-Gel Processing

1988 ◽  
Vol 132 ◽  
Author(s):  
Deanne P. Yamato ◽  
Abraham L. andis ◽  
Teh S. Kuan
Keyword(s):  
Particle Size ◽  
Composite Materials ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Iron Particle ◽  
Ferromagnetic Hysteresis ◽  
Gel Technique ◽  
Gel Processing ◽  
Iron Concentrations

ABSTRACTThe sol-gel technique was used to fabricate α-Fe/mullite composite materials with iron concentrations ranging from 20–60 wt.% Fe. Microscopy studies showed the microstructure to consist of particulate α-Fe dispersed uniformly throughout a mullite matrix. Iron particle size, estimated by TEM, ranged from 20–500 nm. The materials exhibited ferromagnetic hysteresis with saturation magnetization Ms values as high as 115 EMU/g.

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