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 32 for “"carbonaceous materials"”.
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Nanostructured carbohydrate-derived carbonaceous materials
Nanoporous carbon materials are widely used in industry as adsorbents or catalyst supports, whilst becoming increasingly critical to the developing fields of energy storage / generation or separation technologies. In this thesis, the combined use of carbohydrate hydrothermal carbonisation (HTC) and …
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Oxocarbon-derived porous carbonaceous materials for electrocatalysis
… underscores the necessity for advanced carbon materials with specific structural and functional attributes. Porous carbon materials, characterized by their high specific surface area and tunable pore structures, are particularly promising for electrocatalysis. However, the rational design of …
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Stochastic modelling of the growth of carbonaceous materials
… involving key molecules that constitute carbonaceous materials, namely polycyclic aromatic hydrocarbons (PAHs), by applying a detailed particle model solved with a stochastic numerical method. In particular, a Kinetic Monte Carlo (KMC) algorithm is used to study the time-dependent …
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Natural carbonaceous materials for use in transparent Joule heaters
Natural carbonaceous materials have the potential to be used in a new class of more economically and environmentally sound electronic devices due to their tunable conductivity as well as robust mechanical and thermal properties. This study aims to explore the potential of steam cracker tar (SCT), a …
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Thermal and chemical analysis of carbonaceous materials: diesel soot and diesel fuel reactor deposits
Methods for the characterisation of fuel-derived carbonaceous materials were assessed. These methods were applied to two such materials, viz. diesel soot and diesel fuel deposits. Diesel soot: Diesel soot, sampled from a commuter bus, was characterised using an array of analytical techniques. …
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The Role of Carbonaceous Materials in Pavement Dust, Soils, and Lake Sediments on the Fate of Organic Pollutants in Small Urban Watersheds
Field samples were fractionated into light (LFr), heavy (HFr), and condensed CMs (CCMs) fractions with sequential physical and chemical treatment. These fractions and bulk samples were characterized with elemental analysis, Fourier transform infrared spectroscopy, specific surface area measurement, …
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Production of biofuels in a circular cascading bio-based energy system
… processes. It is hypothesised that carbonaceous materials could significantly promote direct interspecies electron transfer (DIET) and accordingly enhance and stabilize AD performance. The first experimental work added carbonaceous materials (nanomaterial graphene and more …
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Biotemplated resin and carbon nanomaterials for energy and environmental applications
… versatile toolkit for growing and assembling nanomaterials with technological importance. Inspired by the natural biomineralization process, much of the existing literature focused on genetically engineering the M13 viral capsid for interaction with inorganic materials, such as metals and oxides. …
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The Contribution of Different Carbonaceous Material Fractions to the Sorption of Hydrophobic Organic Contaminants to Subsurface Sediments
… Illinois, in order to obtain fractions of these materials enriched in one or more of the CM fractions. The results indicate that water/acid soluble organic matters dominate total carbon mass, with kerogen/humin the next most abundant CMs. Isotherm results indicate that condensed form CMs, most …
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Microstructural manipulation and architecture design of carbon-based electrochemical systems
Carbon materials are important in electrochemistry. The often cited advantages of carbonaceous materials for electrochemical applications include wide potential working windows, tunable electrocatalytic activity for a variety of redox species, and ease of modifications either by covalent or by …
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A fundamental study of the selective hydrophobic coagulation process
It has been found that naturally hydrophobic carbonaceous materials such as coal and graphite can be selectively coagulated and separated from hydrophilic impurities without the use of oily agglomerants, flocculants or electrolytes. The coagulation occurs at ζ-potentials significantly higher than …
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The Chemistry of Metal Oxyhydroxides and their 3D Porous Hybrid Materials for the Capture, Transport and Degradation of Toxic Chemicals
… require the development and testing of robust materials and methods to capture and destroy these harmful chemicals. This dissertation discusses the fundamental properties (e.g., structure, stability and activity) of metal oxyhydroxide based 3-dimensional porous materials, such as metal organic …
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Molten Alkali Metal Borate/Carbonate Salts for High Temperature CO₂ Capture and Electrochemical Conversion
… conversion of CO2 into value-added carbonaceous materials, including carbon nanotubes (CNTs). While electricity requirements are significant, the high economic value of CNTs make these processes potentially appealing both as a means of carbon sequestration and as an alternative to …
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BIOCHARS AS AMENDMENTS FOR SASKATCHEWAN AGRICULTURAL SOILS
… are the product of high temperature treatment of carbonaceous materials with little or no oxygen present, termed “pyrolysis”. Biochars derived from the pyrolysis of biomass feedstocks have proven effective amendments on highly weathered tropical soils. However less is known about their impact on …
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The adsorptive properties of oligomeric, non-ionic surfactants from aqueous solution
… removed 02- ions. Calcining the sample removed carbonaceous materials from the surface and also caused a decrease in the surface area. The quartz was shown to be non-porous by SEM and BET analysis. The adsorption experiments for this study were carried out using a simple tumbling method for …
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Thermodynamics and kinetics of hydrophobic organic compound sorption in natural sorbents and quantification of black carbon by electron microscopy
… Agreeable OC/BC estimates on a variety of carbonaceous materials were obtained using the method. The good analytical potential of the method warranted further exploration and methodological refinement. This study has great implications for the sequestration and bioavailability of HOCs in …
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Nanoscale Carbon Architectures for Electrode Applications
… first objective was to synthesize a variety of carbonaceous nanomaterials using plasma torch and furnace-based expansion-reduction techniques. The second objective was to correlate the unique characteristics of these materials to their electrical properties when assembled into electrochemical …
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Coal gasification for fuel synthesis: Multiphysics modeling and new concepts
<p>Fuel synthesis through gasification of carbonaceous materials (e.g. coal and biomass) has the potential to provide a solution to the increasing demand for energy and liquid transportation fuels. To theoretically understand the complex physical and chemical processes in a gasifier and to identify …
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Stratigraphy and sedimentology of the Sentinel Butte formation (Paleocene) near Lost Bridge, Dunn County, west-central North Dakota
… minor amounts of biotite, chlorite, and organic materials. Sand beds become finer grained from bottom to top, are poorly to very poorly sorted, and have an erosional base. Large-scale cross strata are visible in the lower and middle parts of the sand beds, and small-scale cross-strata are usually …
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Contributions to Exceptional Fossil Preservation
… diagenetic, and weathering processes) and carbonaceous materials replicating exceptionally preserved fossils. The third chapter examines the causes of preservational variations observed among organophosphatic tubular shelly Sphenothallus fossils in the lower Cambrian of South China using an …
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