Global ETD Search
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 274 for “"high surface area"”.
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Nanostructured Porous High Surface Area Ceramics for Catalytic Applications
… silicon carbide and allowed the preparation of high temperature stable mesoporous silicon carbide ceramics. Chemical vapor infiltration of SBA-15 with dimethyldichlorosilane at elevated temperatures yields SiC/SBA-15 nanocomposites. The subsequent HF treatment of those composites resulted in …
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Fabrication and characterization of high surface area nickel-deposited graphite substrates
… these inefficiencies is to operate the cell at high current densities, which is obtainable given a high cathode to anode surface area ratio; however, commercially available metal foams often do not provide sufficient surface area density (cm 2/g). Coating high-surface area materials in the …
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The development and characterization of tailored, high surface area adsorbents for enhanced adsorption
… (fast adsorption/desorption kinetics), high surface area, narrow micropore size distribution, and ease for in-situ reactivation. Despite these advantages, the ACFs were precluded to use in niche markets because of their high cost $(>\$100$/lb.) and their poor wear properties. This thesis …
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New Approaches to the Synthesis of Porous and/or High Surface Area Transition Metal Oxides
… approaches to the synthesis of porous and/or high surface area transition metal oxides. In addition, applicability and advantage of charged templates where strong Coulomb interactions favour the supramolecular arrangements/assembly were studied. The problems related with the dynamics of …
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The Synthesis Of High Surface Area Ti Sponges By Halide Conversion Process For Capacitor Anodes
… to grow oxide films over the entire sponge surface and evaluated by measuring the capacitance and leakage current. The anodized Ti sponge samples, with their oxide films of high dielectric constant, can provide high surface to volume ratio to obtain energy density as high as 1J per gram of …
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Synthesis and characterization of rigid nanoporous hypercrosslinked copolymers for high surface area materials with potential hydrogen storage capabilities
… a series of hypercrosslinked polymers with high surface area and studied their surface properties and hydrogen storage capacities. McKeown and his coworkers studied a class of materials termed Polymers of Intrinsic Microporosity (PIMs) which are also based on a "hypercrosslinked" concept. We …
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Facile Synthesis of High Surface Area Molybdenum Carbide and Nitride: An Application in Support Materials for Oxygen Reduction Reaction
A method to synthesize high surface area α-MoC(1-x) without the temperature programmed reduction (TPR) of MoO3 is described. This method was then used, in conjunction with a novel in situ method to obtain highly dispersed PtMoz supported on α- MoC(1-x), to explore the suitability of such materials …
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Sodium Fluoride Hopper Crystals
… this study, crystals of sodium fluoride with a high surface area to volume ratio were prepared by the addition of an aqueous solution of sodium fluoride to an antisolvent method using ethanol. Key variables in the preparation of these crystals included the amount of water present in the …
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Mesoporous organosilica materials with amine functions : surface characteristics and chirality
… synthesized and self-assembled. This leads to a high surface area functionality which is analysized with copper (II) and water adsorption.
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The effect of alternative detergent builders on the nutrient removal activated sludge sewage treatment process
… but renders the water less usable. Most of the highly eutrophied water bodies with a high phosphorus load still receive up to 90 of their phosphorus input from effluents discharged by sewage treatment works (Pretorius, 1983). The phosphorus content of domestic sewage originates from two main …
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Ruthenium-Chromium Oxide Aerogels Oxygen Evolution Electrocatalysts: Structure, Activity and Stability
… Ruthenium-oxide based catalysts have shown the highest reported activities of any acidic OER catalysts, but their instability is a major roadblock for wider use. In this work, we report the synthesis, structure and properties of ruthenium-chromium oxide and ruthenium oxide aerogel-derived …
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Nanostructured carbon-based materials for electrochemical applications
… and fuel cells), mainly due to their high surface area, tunable pore distribution, and good electrical conductivity. Though carbon is chemically stable, mesoporous carbons used in fuel cells are susceptible to corrosion when exposed to high positive overpotential in acid media that …
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Mechanistic insights on the merits and limitations of advanced treatment processes for removal of contaminants of emerging concern
… materials and there is a need to develop ultra-high surface area activated materials that exhibit high adsorption capacity and selectivity for target contaminants. Furthermore, non-destructive methods only transfer the contamination from one phase to another and therefore must be used in …
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Bible as Interface
… consider <em>bible as an interface that affords high surface area, collaboration, and anarchy.</em> Building on a growing attention to materiality in the study of religion and iconic books like the bible, I suggest bible as interface here to signal that bible is more than a container of content. …
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Processing and characterization of nanocrystalline ceria
… media, paint additives and cosmetics. The use of high surface area, nanocrystalline CeO₂ powder could benefit all of these applications. This is particularly true for processing dense components, since the high melting point (2400⁰) of pure CeO₂ makes it difficult to sinter. In this dissertation, …
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High Performance Electrode Materials From Carbon Nanofibers with Tunable Pore Architectures
… excellent performance, rapid charge-discharge, high power densities, along with long cycle life. But EDLCs possess low energy densities (<10 Wh/kg) which limit their use in real world applications. Therefore current research is focused on increasing the energy density of EDLCs while maintaining …
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Design and Development of Biocompatible MOFS and Silica-Based Nanocarriers with Controlled Pharmacokinetics for Drug Delivery Applications
… applications, owing to their exceptionally high surface area and highly structured porous network. The overall goal of this research was to optimize the pharmacokinetic behavior of several highly porous biocompatible drug carriers that have the potential to carry Ibuprofen, 5-Fluorouracil, …
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Investigation of High Surface Air-to-Phase-Change-Material Heat Exchangers for the Heating, Ventilation, and Air-Conditioning Industry
… change material heat exchanger. In this study, high surface area heat exchangers that contain phase change materials will be designed and additively manufactured through masked stereolithography printing for testing. While keeping the volume of phase change material constant in each heat …
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Development Of A Unified Approach (An Index) To Study The Particulate, Carbon Monoxide Emissions And The Combustion Efficiency Using Field And Laboratory Investigations
… in these studies was that they didn’t use the surface area of the particles emitted from the cookstoves. As it has been established in the previous studies, the ultrafine particles have more surface area and therefore they interact with a large area of the human lungs. Therefore, surface area …
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Development of new pyrochlore-type electrocatalysts for oxygen evolution reaction in acid
… the intrinsic material properties that yield high OER activity and stability; and (3) developing synthetic techniques to enhance the OER activity of a catalyst. The first part of the thesis concentrates on new material synthesis and methods to analyze activity and stability. Next, both …
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