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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 93 for “"alkoxide"”.
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The synthesis of biodegradable polymers using aluminium alkoxide initiators
Alkyl aluminium alkoxides have been used as initiators for the ring opening polymerisation of ε-caprolactone and δ-valerolactone. The effect of the reaction solvent on the kinetics of the polymerisation of ε-caprolactone has been studied. The rate of polymerisation was found to be faster in …
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Microstructure development in alkoxide-derived mullite and mullite/zirconia composites
Made available in DSpace on 2011-05-07T13:05:51Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9503362.pdf: 6061044 bytes, checksum: a80d4cfd87ff6cfa07c6e501b0ab11c4 (MD5) Previous issue date: 1994
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New synthetic and structural alkali metal chemistry of alkoxide and triazine ligands
No abstract available
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The chemistry of metalorganic chemical vapor deposition from a copper alkoxide precursor
The chemistry of chemical vapor deposition from copper (II) dimethylaminoethoxide onto single crystal strontium titanate has been studied by in situ infrared analysis of the vapor phase in the reactor, and by simultaneous mass spectrometer analysis of the reactor outlet gas. Species condensed from …
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Sharing the Burden of Reactivity: Synthesis, Characterization, and Reactivity of Phosphino-Alkoxide First-Row Transition Metal Complexes
… Lewis pairs. Specifically, a phosphino-alkoxide ligand was developed to promote high-spin complex formation, produce unconventional geometries, and enable controlled dimerization. The complexes produced with this ligand were screened for bond activation capabilities, revealing activity …
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Evolution of molecular structure during the sol-gel processing of lithium niobate and the development of microstructure in alkoxide-derived thin layers
… and lithium niobium methoxyethoxide bimetallic alkoxides were used for both gel and thin-layer formation. Advantages of sol-gel processing were demonstrated by synthesis of LiNb(OCH$\sb2$CH$\sb3)\sb6$crystals having the proper cation ratio for stoichiometric LiNbO$\sb3$. The alkoxide deposition …
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Studies on directed lithiation: 1. Reactivity studies on alkoxide-directed lithiation reactions. 2. NMR spectroscopic characterization of the solution structure of an asymmetric lithiation reagent
… of a favorable geometric orientation of the alkoxide directing group with respect to the proton being removed. The second lithiation is the only example of a bis-cyclopropyl compound undergoing dilithiation and appears to be the result of a complex-induced proximity effect.
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Role of metal alkoxides as primers in polymer/metal adhesion
… research is to study the effect of four metal alkoxides on the adhesive bonding of steel. The topography and chemical composition of gritblasted, alkoxide primed surfaces were determined using primarily scanning electron microscopy and x-ray photoelectron spectroscopy. Gritblasted steel was …
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Sol-gel deposition of oxide-ion conducting thin films ; and, Liquid precursors to hafnium and tantalum carbides
… a soluble form of bismuth acetate, a vanadium alkoxide, and the acetate or alkoxide of the dopant metal (Me). Copper-doped films were spincoated onto nonporous quartz substrates and pyrolyzed. These were initally defect-free, but became agglomerated on heating at higher temperatures. The use of …
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Aspekte der Reaktivität von Tris(pyrazolyl)borat-Zinkalkoxid- und Tris(pyrazolyl)borat-Zinkhydrid-Komplexen
Metallalkoxide und -hydride weisen nukleophile, basische und reduzierende Eigenschaften auf. Es galt zu untersuchen, inwieweit diese Eigenschaften auf Tris(pyrazolyl)borat-Zinkhydrid-Komplexe (TpZnH) und Tris(pyrazolyl)borat-Zinkalkoxid-Komplexe (TpZnOR) elektronenreicher Alkoholate übertragbar …
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An NMR study of 2-ethyl-1-butyllithium and of 2-ethyl-1-butyllithium/lithium 2-ethyl-1-butoxide mixed aggregates
… resulted in alkyllithium/lithium alkoxide mixed aggregates, apparently of the form Ra(RO)bLia+b. A multinuclear, variable temperature NMR study of samples with O:Li ratios of 0.2 and 0.4 showed, in addition to the alkyllithium, the formation of four mixed aggregates, one of them …
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The precipitation of uniform silica particles through the controlled hydrolysis of silicon alkoxides
The formation of uniform silica particles by the alkoxide route has been investigated. Rates of chemical reactions involved in the precipitation are reported and linked to particle growth rates. Seeded growth experiments indicate that reactions between soluble species occur at rates that are …
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Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
… involves three main steps: first, a metal alkoxide (Si-alkoxide) in alcohol-based medium undergoes hydrolysis at a predetermined pH; the next step involves condensation, where Si-OH tetrahedra linkages occur and eventually result in an SiO 2 network. The third step involves solvent …
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Model systems for the investigation of metal-support interactions in cobalt based Fischer-Tropsch
… nanoparticles (NPs) to a dilute solution of an alkoxide, tetraethyl orthosilicate (TEOS) or triphnyl ethoxy silane (TPEOS), Co-O-Si bond (ligand) is expected to form until it reaches equilibrium state. The concentration of the dilute alkoxide solution can be varied to observe its effect on the …
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Microwave curing of hybrid inorganic-organic ceramers and some additional structural features of these material
… of PTMO chain expansion at higher metal alkoxide contents in these ceramers when cast onto a substrate onto which the film adheres. Finally, structural investigations into the ceramers using SAXS, gives an idea of the fractal dimensions of the scattering phases. These investigations have …
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Synthesis and characterization of (β-diketonate) zirconium alkoxides for low temperature chemical vapor deposition of lead zirconium titanium thin films
Metal alkoxides have been known for many years. Recently, a renewed interest in these compounds has arisen as they have been found to be viable precursors for metal oxide film synthesis. Lead zirconium titanate(PZT) films have shown promise for many applications in the electronics industry. …
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Environmentally friendly hybrid coatings for corrosion protection: silane based pre-treatments and nanostructured waterborne coatings
… of an experimental mixture of hybrid silicon alkoxides molecules were applied onto aluminium and hot dip galvanized (HDG) steel for the development of effective and environmentally friendly corrosion protection systems A chemical and electrochemical characterization of the sol-gel films …
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Supramolecular templating of mesoporous zirconia-based nanocomposite catalysts
… to form micellar cores, around which the alkoxide hydrolyzed and condensed to form an organic-inorganic mesostructure. The phosphate head group reacted with the zirconium alkoxide to form a covalent linkage, which was found necessary for formation of the mesostructure. The phosphate head …
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Developing C–H bond Functionalization, Organocatalytic Hydrophosphination Reactions and Anti-Invasion Agents
… 1-3, we will discuss the development of iron alkoxide complexes for C–H bond functionalization. Currently, methods for C–H bond functionalization rely on precious metal catalysts that present environmental and health concerns. Earth abundant metals have been explored as sustainable catalysts; …
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Catalytic, Enantioselective Cyclopropanation of Allylic Alcohols
… were (1) formation of the ethylzinc alkoxide, (2) use of the Furukawa-Wittig reagent iodomethylzinc iodide, and (3) pretreatment of bis-sulfonamides such with diethylzinc. The single crystal, X-ray structure of a promoter-zinc compound revealed the likely mode of action of this …
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