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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 53 for “"Sol-gel method"”.
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The preparation and characterization of PEK/TEOS glasses by the sol-gel method
… of a new class of inorganic glasses using the sol-gel approach. This technique utilizes metal alkoxide precursors such as tetraethylorthosilcate (TEOS) to build an inorganic glass matrix out of solution by a two step poly(hydrolysis-condensation) reaction mechanism. The benefits of making …
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Synthesis and characterisation of nitrogen and magnesium-doped with titanium dioxide using sol-gel method
… nitrogen and magnesium were used as dopants and sol-gel method is applied. Calcination temperatures were varied at 300 oC, 500 oC and 700 oC in order to analyse the phase and characteristics of samples at different calcination temperature. The results obtained from the experiment showed the band …
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Electrical properties of doped and undoped PZT thin films prepared by a sol-gel method
… phenomena. Attempts were made in this study to solve these problems: 1) by minimizing oxygen vacancy entrapment at the interfaces by employing RuO₂ electrodes; 2) by lowering the oxygen vacancy concentration in PZT films using donor doping (e.g. La³⁺ at Pb²⁺ site and Nb⁵⁺ at Ti/Zr⁴⁺ site). For …
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Synthesis of lithium manganese phosphate by controlled sol-gel method and design of all solid state lithium ion batteries
… on intermittent energy sources like wind and solar energy, focus has been on alternative energy sources. To eliminate the need for fossil fuels, advances are being made to provide energy for hybrid electric vehicles (HEV), plug-in hybrid vehicles (PHEV) and pure electric vehicles (EV) thus …
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Naujų metodų metaliniams kultūros paveldo dirbiniams konservuoti kūrimas ir taikymas /
… conservation of metal objects. However, these methods do not provide successful preservation of metals for a longer term. Researchers are mainly focused on obtaining long–term, anticorrosion, protective coatings and methods that could replace toxic solutions used in conservation and restoration …
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Naujų metodų metaliniams kultūros paveldo dirbiniams konservuoti kūrimas ir taikymas /
… conservation of metal objects. However, these methods do not provide successful preservation of metals for a longer term. Researchers are mainly focused on obtaining long–term, anticorrosion, protective coatings and methods that could replace toxic solutions used in conservation and restoration …
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Secondary pyroelectric and electrocaloric effects in thin films
… many applications such as energy harvesting and solid-state cooling. This dissertation focuses on the characterization of the pyroelectric and electric coefficient in thin film using novel laser-based technique. The implementation of the systems is described in detail, and heat transport models …
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Development and characterization of bioceramic coatings for medicall and dental applications
… prepared by the more widely used and commercial method, plasma spraying technique suffer from poor adhesion or delamination from the substrate. The high temperatures also results in a number of unstable decomposition phases compared to the more crystalline phase. The main purpose of the present …
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Sol-gel synthesis of one-dimensional photonic bandgap structures
… using SiO2 and TiO2 films deposited from solution by the sol-gel method. A dielectric mirror, or broadband interference filter, was fabricated by alternating quarter-wave optical thickness layers of the two films on a silicon substrate for a total of six layer pairs. This device exhibited …
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Novel Materials and Processes for Fabrication of Integrated Photonic and Opto-Electronic Devices
… devices. Typically thin films are made from methods that involve expensive or complicated processes, such as chemical vapor deposition (CVD), sputtering, and electron beam evaporation. In this work, design, fabrication, and characterization is done with novel sol-gel and polymer materials …
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Fabrication and characterization of Phosphate-based planar waveguides activated by Er3+ ions
… wave-guides activated by rare earth ions both by sol-gel and RF-sputtering techniques. The objective of this thesis has been to evaluate various methodologies for fab-rication Phosphorous-based planar waveguides. In this context sol-gel and RF-sputtering techniques for planar waveguides …
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EARTH-ABUNDANT METAL CHALCOGENIDES: SYNTHESIS, INTERFACE MODIFICATION, AND APPLICATIONS IN ENERGY CONVERSION DEVICES
… which rises criticism on their candidacy as a solution for future sustainable energy. The focus of this work is to develop low-cost solution methods to synthesize non-toxic earth-abundant MC materials Cu2ZnSnS¬4 (CZTS) and Sb2S3 for thin-film solar cells and thermoelectric generator. By …
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Studies of Titanium Dioxide Nanoparticles and Surfactants Effects, Singly and in Combinations, on Luminescence Intensity of Some Aromatic Compounds.
… was synthesized using the low temperature sol-gel method. Carbazole and phenanthrene were severely quenched by all surfactants singly or in combination with TiO<sub>2</sub>. Anthracene and fluoranthene showed some enhancement in their luminescence intensity. The most dramatic effect was …
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BiMnO3 turinčių kietųjų tirpalų sintezė ir tyrimas /
… synthesized in this work. For the first time sol-gel combustion method was succesfully employed for the preparation of BixLa1-xMnO3+δ solid solutions. XRD analysis demonstrated that the maximal amount of BiMnO3 in LaMnO3 structure was 65 mol%. The phase transition was observed from trigonal …
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Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
… can reduce the performance of the amplifier. Sol-gel chemistry, combined with the dip-coating method is a means to develop rare-earth doped planar waveguides for such integrated optics components. The sol-gel process involves three main steps: first, a metal alkoxide (Si-alkoxide) in …
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Limitation of lithium fluoride (LiF) properties for passivation layer in organic solar cells application
Organic solar cell (OSC) is a low cost renewable energy. Instead of semiconductor silicon solar cell; it is a device that converts the energy of light into electrical energy using photovoltaic effect. Nowadays, global warming and emission of greenhouse effect are the sources of the destruction of …
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The production and characterization of ceramic carbon electrode materials for CuCl-HCl electrolysis.
… spread adoption of H2 fuel cells. A potential solution to this problem is the Cu-Cl hybrid thermochemical cycle. The cycle captures waste heat to drive two thermochemical steps creating CuCl as well as O2 gas and HCl from CuCl2 and water. The CuCl is oxidized in HCl to produce H2 gas and …
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The heterogeneous partial oxidation of light alkanes
… ZrO₂-based catalysts synthesized via the sol-gel method were found to exhibit superior activity, selectivity and stability for ODHE. Sulfate decomposition experiments related the ODHE activity of these materials to the influence of the Si dopant on the sulfate binding strength. The sol-gel …
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Preparation of Copper-Based Oxygen Carrier Supported on Titanium Dioxide
… CO2 inherently concentrated. In this process, a solid oxygen carrier is used to transfer oxygen from the air reactor to the fuel reactor, which completely isolates nitrogen in air to meet with fuels. The oxygen carriers in the combustion process are subjected to the severe environments, such as …
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