Now showing items 11-20 of 22
Synthesis and characterization of nanocomposite films with a titania glass matrix by the sol–gel route
(John Wiley & Sons, Ltd., 1999-05)
Films of thickness ∼3 µm containing nanosized metal particles of iron, nickel and copper respectively were grown on a Corning glass slide using a sol-gel technique. The particle sizes had values in the range 6.8 to 20.1 14nm. ...
Silsesquioxanes as models of silica supported catalyst I. [3-(Diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] and [3-mercapto-propyl]-hepta[propyl]-[octasilsesquioxane] as ligands for transition-metal ions * Dedicated to Professor Manfred Weidenbruch on the occasion of his 60th birthday.
(John Wiley & Sons, Ltd., 1999-04)
The ligand [3-(diphenylphosphino)propyl]-hepta[propyl]-[octasilsesquioxane] (dpps) can be prepared by reacting [3-chloropropyl]-hepta[propyl]-[octasilsesquioxane] (cs) with KP(Ph) 2 . The transition-metal complexes ...
Monosubstituted octasilasesquioxanes
(John Wiley & Sons, Ltd., 1999-04)
Octasilasesquioxanes are cube-shaped molecules consisting of a Si 8 O 12 core and eight reactive sites, which can, in principle, all be functionalized differently. This review article provides an overview of the work, ...
Organosilanetriols: model compounds and potential precursors for metal-containing silicate assemblies Dedicated to Professor Manfred Meisel on the occasion of his 60th birthday
(John Wiley & Sons, Ltd., 1999-04)
The chemistry of silanols and related amino-silanes is a topic of current interest in view of their possible applications as building blocks in materials science. In particular, discrete silanetriols and triaminosilanes ...
Siloxane network formation from the Si 8 O 20 8− silicate species and dimethyldichlorosilane
(John Wiley & Sons, Ltd., 1999-04)
Organic-silica hybrids were synthesized from the Si 8 O 20 8− silicate anion by the reaction with an excess of dimethyldichlorosilane. The structure of the hybrids has been found to comprise the Si 8 O 20 8− structure ...
Synthesis and applications of TEOS/PDMS hybrid material by the sol–gel process
(John Wiley & Sons, Ltd., 1999-05)
An organically modified silicate, ormosil, was synthesized with an inorganic precursor, (tetraethoxysilane, TEOS) and an organic precursor [poly(dimethylsiloane), PDMS] through sol–gel chemistry. The bonding characteristics ...
The reaction of H 8 Si 8 O 12 with a chromium oxide surface: a model for stainless steel surface modification
(John Wiley & Sons, Ltd., 1999-04)
Many metal alloys are susceptible to corrosion, particularly after processing steps such as welding. Chemical vapor deposition (CVD) is an effective way to modify metal surfaces and impart specific physical and chemical ...
M x –O y –Si z bonding models for silica-supported Ziegler–Natta catalysts
(John Wiley & Sons, Ltd., 1999-04)
Three reactants, polyhedral oligosilsesquioxanes (POSS) (c-C 6 H 11 ) 7 (Si 7 O 9 )(OH) 3 (1), butylethylmagnesium (2) and titanium tetrachloride TiCl 4 (3), react in three different ways according to the order of addition ...
Octa(3-chloroammoniumpropyl) octasilsesquioxane
(John Wiley & Sons, Ltd., 1999-04)
The octahydrochloride salt of octa(3-aminopropyl)octasilsesquioxane can be isolated in 30% yields by controlled hydrolytic condensation of 3-aminopropyltriethoxysilane in strongly acidic methanol. The analytically pure ...
Cracks developed during SrTiO 3 thin-film preparation from polymeric precursors
(John Wiley & Sons, Ltd., 1999-05)
Strontium titanate (SrTiO 3 ) thin films were prepared by dip-coating Si(111) single-crystal substrates in citrate solutions of ethylene glycol, considering several citric acid/ethylene glycol (CA/EG) ratios. Measurements ...