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 23 for “"carbon matrix"”.
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Processing and Properties of Particulate Reinforced Carbon Matrix Composites
Carbonization of biomass is a type of pyrolysis that allows for the formation of byproducts that have applications in many other industries [1]. In the field of materials science concerned with environmental impact intersecting with desirable material properties and performance, the process of …
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Mechanical and Thermal Characterization of Continuous Fiber-Reinforced Pyrolysis-Derived Carbon-Matrix Composites
… and manufacturing aspects. Even traditional carbon-carbon, aerogel, and ceramic approaches are highly limited by difficult manufacturing techniques and are subject to sensitive handling throughout their processing and lifetime. Despite their utility in extreme environments, the high costs of …
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Synthesis and mechanical characterization of aligned carbon nanotube metal- and carbon-matrix nanocomposites
Carbon nanotube (CNT) assemblies are seeing increasing use in engineering applications due to their advantaged, mass-specific physical properties. The high strength-to-weight ratio, electrical and thermal conductivity, and elastic properties make CNTs ideal for many aerospace, automotive, and …
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Synthesis and characterization of next-generation multifunctional material architectures : aligned carbon nanotube carbon matrix nanocomposites
Materials comprising carbon nanotube (CNT) aligned nanowire (NW) polymer nanocomposites (A-PNCs) have emerged as promising architectures for next-generation multifunctional applications. Enhanced operating regimes, such as operating temperatures, motivate the study of CNT aligned NW ceramic matrix …
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Structure-property relations of nanostructured carbon systems as a function of processing
… their intrinsic properties and nanometer scale, carbon nanotubes (CNTs) are commonly used to enhance the material properties of engineering materials. However, structural defects can significantly alter the intrinsic properties of CNTs, thereby limiting the physical properties of aligned CNT …
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The design of a microfabricated air electrode for liquid electrolyte fuel cells
… patterned macro-texture upon a microporous carbon matrix. The resulting dual porosity structure consists of an array of cylindrical holes that are formed from the die and micropores present in the carbon matrix. The holes are used for gas transport while the micropores are saturated with a …
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IMPACT OF HEAT TREATMENT AND OXIDATION OF C/C COMPOSITES ON MICROSTRUCTURE AND PHYSICAL PROPERTIES
Carbon-carbon (C/C) composites are notable among engineering materials in aerospace and defense industries possessing excellent specific mechanical, thermal, frictional and wear properties. C/C maintain their properties at temperatures where most of the high end alloys give in, and maintain their …
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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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Electrochemical Studies of Copper-Activation of Sphalerite and Pyrite
Carbon matrix composite (CMC) electrode and surface conducting (SC) electrode have been developed to study the copper-activation and the subsequent xanthate adsorption on insulating sphalerite. Fabricating CMC electrode involves embedding sphalerite particles in carbon to form a carbon matrix …
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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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Processing and characterization of boron nitride composites and films
While carbon/carbon composites (C/C) have found broad use in commercial aircraft brakes, their further application is limited by high fabrication costs, susceptibility to oxidation, and high electrical conductivity. Boron nitride (BN) provides a suitable alternative to carbon because of its …
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EXPLORATION OF TM-NX ORR ELECTROCATALYSTS FROM FIRST PRINCIPLE CALCULATIONS
… where the defect motifs are embedded in a carbon matrix during pyrolysis. By studying the material properties of individual defects we can determine how the chemistry and morphology of these TM-Nx motifs are interdependent. Additional focus will also be on XPS characterization for the …
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Design of chemically treated activated carbon fibers for mercury removal and advanced membranes for water purification
… one is to develop chemically treated activated carbon fibers for mercury removal from power plant effluents, and the other one is to design advanced nanofiltration membranes for water purification with specific features, i.e. solvent resistance and antifouling properties. The current …
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Development of Carbon-Based, Controlled-Release Soil Ameliorants Through Chemical Pathways
This thesis aimed to develop and validate the Carbon Control Technology (CCT®), a novel, patented process for converting waste agricultural residues into carbon-based controlled-release fertilizers (CBCRFs) through chemical carbonization followed by nutrient impregnation. The process involved …
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DESIGN OF AN EFFICIENT AND RAPID CHEMICAL VAPOR INFILTRATION (CVI) RE-CIRCULATION SYSTEM
Carbon-carbon (C/C, carbon fiber reinforced carbon matrix) composites are widely used in the aerospace industry because of the material's high temperature capability and structural properties. C/C maintains its mechanical and friction properties during extreme conditions so it is used extensively …
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1, 2, and 3 Dimension Carbon/Silicon Carbon Nitride Ceramic Composites
… on 1-D nanofibers, 2-D films and 3-D bulk, carbon-rich silicon carbon nitride (SiCN) ceramics. 1-D nanofibers were prepared via electrospinning for light weight, flame retardant and conductive applications. The commercially available CerasetTM VL20, a liquid cyclosilazane pre-ceramic …
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The Fate of Flame Volatized Sodium During the Combustion of Pulverized Coal in Reaction With Silica and Sulfur (Studied with the Aid of a Synthetic Coal)
… quartz were bound together in a synthetic coal matrix and subject to various temperature profiles ranging from 900-1500°C and residence times ranging from 0.1 to 1.4 seconds. As well as studying the inorganic reactions, a detailed look was also spent on the actual combustion characteristics of …
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Characterization of battery anode materials by X-ray and electron-based imaging techniques
To tackle the problem of increasing carbon dioxide emissions, Li batteries have been proposed as a promising storage medium of electricity harvested from renewable clean energy sources. In addition, Li batteries are the predominant power sources in cell phones, laptops and electric vehicles. …
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Impact of morphology and confinement effects on the properties of aligned nanofiber architectures
… 3D morphology of a relevant NF system, carbon nanotubes (CNTs), assembled into aligned CNT (A-CNT) arrays. New descriptions of the multi-wall A-CNT morphology demonstrate that the CNT tortuosity, quantified via sinusoidal amplitude-wavelength waviness ratio (w), decreases significantly …
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Understanding How Tape Casting Titanium Diboride Shifts its Processing-Microstructure-Properties Paradigm Toward New Applications
… particle. The resulting rod-shaped, glass-like carbon matrix embedded with ZrC crystals is described. These rods have potential as reinforcements for iii high temperature applications and as a synthetic route for ultra-high temperature ceramics with unique morphologies. It is the first time that …
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