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 44 for “"graphitic carbon"”.
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Investigation of nanoscale mechanisms driving erosion and pitting in graphitic carbon
… mechanisms that causes oxidative pitting in carbon materials is essential to accurately predict ablation rates of Thermal Protection Systems (TPS) during hypersonic reentry. The extreme heat and unique gas phase chemistry encountered during hypersonic reentry necessitates an analysis of the …
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Thermal Characterization of Graphitic Carbon Foams for Use in Thermal Storage Applications
<p>Highly conductive graphitic foams are currently being studied for use as thermal conductivity enhancers (TCEs) in thermal energy storage (TES) systems. TES systems store energy using the latent heat capacity of phase change materials (PCMs). Due to the low thermal conductivity of most PCMs, TCEs …
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NOVEL SYNTHETIC METHODS AND APPLICATIONS OF POROUS MATERIALS: AEROGEL FOAMS, METALLIC AEROGELS, AMORPHOUS AND GRAPHITIC CARBON AEROGELS
… foams, pure metallic aerogels, amorphous and graphitic carbon aerogels, and their applications. I. Polyurethane based aerogel foams were synthesized with an aliphatic triisocyanate and ethylene glycol through a pressurized (7 bar) sol-gel method. The foam-like structure is prepared without any …
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Low Temperature Electrical Transport in 2D Layers of Graphene, Graphitic Carbon Nitride, Graphene Oxide and Boron-Nitrogen-Carbon
… dependent electrical transport properties of carbon based two-dimensional (2D) nanomaterials. Various techniques were employed to synthesize the samples. For instance, high quality large area graphene and boron, nitrogen doped graphene (BNC) were grown using thermal catalytic chemical vapor …
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"Reactive hard templating" : from carbon nitrides to metal nitrides
… of classical templating techniques difficult. Graphitic carbon nitride, g-C3N4, despite its fundamental and theoretical importance, is probably one of the most promising materials to complement carbon in material science and many efforts are put in the synthesis of this material. A simple …
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On new allotropes and nanostructures of carbon nitrides
In the first section of the thesis graphitic carbon nitride was for the first time synthesised using the high-temperature condensation of dicyandiamide (DCDA) – a simple molecular precursor – in a eutectic salt melt of lithium chloride and potassium chloride. The extent of condensation, namely next …
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Wettability of graphitic materials and their application in separation
Graphitic carbon-water interaction or wettability of graphitic materials has received significant interest due to extraordinary thermal, physical, and electrical properties of different forms of graphitic carbon and influence of wettability in condensation, adhesion, separation, tribology, and …
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Development and characterisation of macro-disc and micro-band electrodes for electrochemical sensing applications
… section explores the use of laser-scribed graphitic carbon for flexible sensing applications. A facile fabrication method was assessed involving electrodeposition of platinum followed by two casting steps to functionalise electrodes. This study examined the chronoamperometric response of …
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Carbon Nitride as a Heterogeneous Photocatalyst for Organic Transformations
… Ir or Ru metal complexes. In this thesis, carbon nitrides have been introduced as an inexpensive, stable, easy-to-synthesise, scalable and non-toxic heterogeneous photocatalyst. Prior to this work, carbon nitrides have been mostly studied as a photocatalyst for solar fuel productions and …
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Application of scalable and inexpensive modification on carbon in clean technologies
Carbon can be a game-changing material to meet the global challenges in freshwater production and renewable conversion and storage devices due to their versatile nature. However, its hydrophobic characteristics, poor stability, low electrical conductivity, and small number of active sites limit its …
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Novel carbon materials with hierarchical porosity : templating strategies and advanced characterization
The aim of this work was the generation of carbon materials with high surface area, exhibiting a hierarchical pore system in the macro- and mesorange. Such a pore system facilitates the transport through the material and enhances the interaction with the carbon matrix (macropores are pores with …
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Graphite-conjugated catalysts : bridging heterogeneous and homogeneous catalysts
… molecularly well-defined active sites to graphitic carbon surfaces.
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Environmental tuning of the reactivity of molecules confined to polarized interfaces
… a molecular site and the band structure of graphitic carbon electrodes or using this coupling as a tool to understand the reactivity of molecules confined to solid-liquid interfaces. Chapters two through four explore environmental contributions to porphyrin electrocatalysis.
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Density functional theory calculations on materials in photocatalysis
… how the photogenerated holes exist in the novel graphitic carbon nitride (g-C3N4) material. In chapters 5 and 6, we focus on the conventional TiO2 material and focused on the more favoured hydrogen coupling mechanism and the electron transfer step in defected system, respectively.
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Novel nanomaterials for efficient photocatalytic ammonia synthesis
… of novel metallic ruthenium particle modified graphitic carbon nitride photocatalysts. Compare with bulk graphitic carbon nitride, the optimal sample had 2.93-fold photocatalytic nitrate reduction to ammonia activity. We also report a facile synthesis of carbon/bismuth/bismuth oxide …
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Characterization of Carbonaceous Exsolvate from Metal Melts
This study seeks to explore the role of carbon meso-structures in the strengthening of steel by characterizing the carbonaceous exsolvate from a metal-carbon melt. Metal-carbon matrix composites, such as the material used in this investigation, are commonly employed to strengthen tool steel. …
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DUAL-SIGNAL READOUT ANALYTICAL TOOLS: DESIGN, CHARACTERIZATION, AND APPLICATIONS IN SENSING
… for nitrate ions, employing copper-modified graphitic carbon nitride to merge electrochemical and photoelectrochemical detection methods effectively. The third project outlines the development of a ratiometric sensor for diclofenac, incorporating a benzoquinone-modified mesoporous silica …
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Statistical Electron Microscopy, Rheometric Studies of Carbon Nanotube Solutions in Chlorosulfonic Acid and Characterization of Wire, Planar Antennas Manufactured from Macroscopic Carbon Nanotube Materials
Ever since their discovery in 1991, carbon nanotubes (CNTs) have been a topic of active scientific research. These tubular molecules of graphitic carbon display a unique amalgamation of mechanical, thermal and electrical properties. However, their strong inter-molecular van der Waals attractions …
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The Effect of Average Grain Size on Polycrystalline Diamond Films
… determine elemental composition and the sp2/sp3 carbon fraction. The percentage of (111) diamond was determined by x-ray diffraction, and scanning electron microscopy was performed to determine average grain size. The measured work function has a maximum of 5.1 eV at 0.3 microns, and decreases to …
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