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Showing 1 to 20 of 63 for “"Silanes"”.
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Chemical decomposition of silanes for the production of solar grade silicon
Esta Tesis Doctoral se centra en la reducción del coste y del consumo de energía durante el proceso de producción de silicio ultrapuro, el también llamado polisilicio. Estas reducciones ayudan a la tecnología fotovoltaica basada en silicio a alcanzar dos de sus principales objetivos para …
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Molecular simulations of surfactants and silanes: Self-assembly in solutions and on surfaces, and friction between monolayers
… is used as a guide for modeling the alkylsilanes molecules. However, the current literature is ambiguous whether to describe interactions between the surfactant head groups as short-range or long-range. This work resolves this discrepancy successfully by performing a series of simulations …
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Investigation of spiropyrans and merocyanines in mixed thin films with long chain alkyl silanes: Towards a command surface for liquid crystal realignment
… 2 degrees for films prepared from the trialkoxy silanes upon irradiation with UV light. Evaluation of this system as a surface to control the realignment of the nematic liquid crystal K-15 proved unsuccessful, though the surface energy of the systems can be changed solely by irradiation with …
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Surface modification of titanium dioxide and synthesis of non- electroactive coatings by electrochemical polymerization
… modification of TiO₂ electrodes with various <u>silanes</u> in order to evaluate the stability of modified layers when they are used on <u>photoelectrodes</u> in SEMICONDUCTOR LIQUID-JUNCTION SOLAR CELLS (SLJSC). To determine the nature of the reactivity of surface hydroxyl groups towards …
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Synthesis of New Alkyn-1-ylsilanes. 1,1-Organoboration, 1,2-Hydroboration
New alkyn-1-ylsilanes were prepared, characterized and their use in 1,2-hydroboration, 1,1-organoboration reactions or combination of these two was demonstrated. Although the silanes were in general obtained as mixtures, they could be purified by fractional distillation or crystallization. Many of …
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ATR-FTIR spectroscopy and Raman microscopy studies of organosilane diffusion and hydrolysis in PVC films.
Organosilanes are widely used to bond organic materials such as polymers to inorganic materials in polymer composites. However, the mechanism of adhesion is poorly understood. One postulated mechanism is the interdiffusion of the silane and polymer, along with condensation of the silane to form an …
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UV-curable organic-inorganic hybrid polyurethane coating
… a sol-gel reaction for condensation of the silanes. This study explored the cure extent of both reactions by FTIR for acrylates and silanes and a weight-loss method for silanes as a function of functional group concentration and time. The general film properties were also studied. The …
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Inverse model systems to investigate metal-support interactions in Fischer-Tropsch catalysis
… system by modifying Co3O4 nanocrystallites with silanes (i.e. tetraethoxysilane, trimethyl chlorosilane, triphenyl ethoxysilane). It is postulated that the formation of Co-O-Si will alter the catalytic properties of the cobalt site to which silane is bonded and the adjacent ligand-free sites. The …
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Vibrational Spectroscopy and Atomic Force Microscopy Studies of Silane Adsorption onto Silicon and Glass.
… to study the adsorption of these long-chain silanes at a silica-deuterated toluene interface. The silica surface was provided by the native oxide layer on a silicon ATR prism. The experiment required careful calibration in order to determine the Gibbs surface excess of these silanes on this …
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Utilizing Nanoporous Alumina Membranes for Molecular Transport and Silica Nanotube Synthesis
… modified with a variety of different substituted silanes. The transport of ions through these treated membranes was studied using several analytical tools such as ultraviolet-visible and fluorescence spectroscopy. The surface characteristics of the membrane were studied using a scanning electron …
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Χημική δομή και μεσοφασικές δράσεις τεσσάρων σιλανιούχων σκευασμάτων επιδιόρθωσης κεραμικών όψεων
… still a clinical problem.During the last decade silanes were introduced as the most effective coupling agents for the chairside repair of failed porcelain and acrylic veneers. Most of the studies performed on silanes as repair materials have been focused on the interfacial strength of composite …
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Ligand-Induced Cleavage Of Dinitrogen By A Hafnium Metallocene Complex
… a unique series of reactions with primary silanes, leading to the production of monosilylated dinitrogen units. Complete N-N bond scission is achieved upon thermoylsis of the mono-silylated compounds, and N-C bond formation can be achieved by upon treatment of the silylated compound with …
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The water-repellent treatment of cotton fabrics with organo chlorosilanes
The use of methylchlorosilanes as an agent to produce water-repellent characteristics in cotton fabrics was patented by W.I. Patnode of the General Electric Company. Since very little information has been published on the process, this investigation was undertaken to determine the optimum …
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Anion Relay Cyclopropanation and Aryl Vinyl Cyclopropane Cope Rearrangements
… which obviates the need for synthesis of alkyl silanes or phosphines as starting materials. Chapter 1 is a review of anion relay chemistry, which focuses on through-space anion relay over 3 or more bonds. It covers both new developments and applications to total synthesis of through-space anion …
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Áhrif setu kvenna í stjórnum íslenskra fyrirtækja á vinnubrögð stjórna
… gegn eignarnámi innherja (La Porta, Lopez-de-Silanes, Shleifer og Vishny, 2000). Hægt er að skilgreina fjölbreytni stjórna í tvo hluta; verktengda fjölbreytni (task-related diversity) og ei-verktengda fjölbreytni (non task-related diversity) (Adams, Haan og Terjesen, Ees, 2015). Fjallað er um …
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Identifying Damage, Predicting Expansion, and Determining the Effectiveness of Sealers on Concrete Affected by Alkali-Silica Reaction and Freeze-Thaw
… expansion are given and have shown that silanes with 40% silane work effectively to reduce ASR and freeze-thaw expansion.</p>
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Hydrate formation and adhesion on low surface energy materials
… of the solid surface using two different silanes, we correlate the wettability of water and cyclopentane to the adhesion of cyclopentane hydrates. We demonstrate negligible hydrate formation and adhesion on octadecyltrichlorosilane-coated surfaces via macroscopic visualization, surface …
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Development of Stereoselective Hydrofunctionalization Reactions Enabled by Dual Copper (I) Hydride and Palladium Catalysis
… of vinyl metalloids, including vinyl silanes and vinyl boronate esters.
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Metal-ligand cooperativity in first row transition metals: hydrosilylation catalysis and mechanistic insights
… ligands that assist in MLC activation of hydrosilanes have high potential in promoting PGM-like hydrosilylation activity. Chapter 1 gives an overview of MLC strategies and the classes of metal complexes that exhibit MLC activity, with emphasis on hydrosilylation. Chapter 2 presents the …
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