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 20 for “"graphitization"”.
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Effect of alloying additions in the welding flux on the graphitization and nodularization of the fusion zone in pearlitic ductile iron, The
Includes bibliographical references.
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Laser treatment of Asphaltene based Carbon Fibers
… melt spinning, stabilization, carbonization, and graphitization steps contribute significantly to costs, energy consumption, and greenhouse gas emissions. Consequently, there is a need for cost-effective processing techniques to meet the increasing demand for carbon fiber. This research focuses on …
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An Investigation of the Surface Properties of Sic For the Growth of Gan Thin Films and Epilayers
… thermal annealing of the SiC substrate induces graphitization at temperatures as low as 840 °C, but surface oxides are removed only at 940 °C. UHV Si-beam etching was proposed as a cleaning method that would effectively clean the surface of oxides/carbon contaminants at low temperatures without …
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Surface textures and other features of diamonds
… etching of diamonds in nature and neither pure graphitization nor dissolution appears to be important.
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Estudo teórico da cinética do primeiro estágio de grafitização de um ferro maleável perlítico com o acompanhamento de sua morfologia no microscópio eletrônico de varredura
… theoretical study of the kinetics of first stage graphitization, and on the production of a pearlitic malleable cast iron on which we carried out isothermal treatments for different periods of time, in order to follow the changes of its morfology. These changes were followed using the "Stereoscan" …
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Advanced Carbon Materials Based Electrodes for High Performance Symmetric Supercapacitors
… different biomass are prepared via catalytic graphitization, KOH activation, and plasma treatment. Depending on detailed physical characterizations, porous structure with high surface area and porosity are presented for prepared carbon materials, which serves as reservoir and ion channels for …
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AI-Driven Discovery and Multiscale Computational Frameworks for Carbon-Based Materials
… the temperature- and pressure-dependent graphitization of nanodiamond surfaces, revealing atomistic pathways for sp3-to-sp2 transformation. Chapter 5 explores the co-pyrolysis of cellulose–graphene mixtures through reactive dynamics, coupled with non-equilibrium Green’s function (NEGF) …
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NOVEL SYNTHETIC METHODS AND APPLICATIONS OF POROUS MATERIALS: AEROGEL FOAMS, METALLIC AEROGELS, AMORPHOUS AND GRAPHITIC CARBON AEROGELS
… (800-1500 ºC) compared to conventional graphitization (2500-3300 ºC) from Fe- or Co-catalyzed free-radical surface-initiated polymerization of acrylonitrile monomer to polyacrylonitrile-crosslinked metal oxide xerogel powder compacts. These graphitic carbon aerogels were demonstrated as …
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Investigation on removal mechanism in catalytic aided electrical discharge machining of polycrystalline diamond
… that the catalyst electrode accelerated the graphitization process of PCD.
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AUGER ELECTRON SPECTROSCOPY OF CRYOGENIC MATRIX ISOLATED METAL ATOMS AND DIRECT RECOIL SPECTROSCOPY (DRS), SIMS AND XPS STUDIES ON TITANIUM AND PIQ
… even at relatively low energies, causes profound graphitization of the surface. DRS and XPS data show that appreciable amounts of nitrogen and oxygen can be implanted into the polymer, and that the implanted species are stable up to 300$\sp\circ$C. DRS evidence suggests that water dissociates on …
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Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites
… Electron Microscopy (TEM) images, which showed graphitization of the outer turbostratic layer and the formation of a new interface with the inner, originally graphitic, layer that was characterized by structural discontinuities that reduced the total load bearing capacity of the nanofibers. In …
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Carbon nanotube growth on challenging substrates : applications for carbon-fiber composites
… time to be effective for both CNT growth and graphitization of amorphous carbon and are characterized using in situ metrology. These catalysts show promise for use on substrates that exhibit sensitivity to conventional metal catalysts (such as carbon fibers). New CVD processing techniques …
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Non-precious metal catalysts prepared by chemical functionalization of carbon surfaces.
… success of the diazonium coupling reaction and graphitization during heat treatment are essential to the synthesis of active materials.
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Síntese in situ da liga de FeCo altamente estável encapsulada em carbono a partir do etanol
… will show that a higher and lower degree of graphitization is respectively FeCo-700 and FeCo-500, which uses TEM analysis to confirm the presence of more organized CNTs for FeCo-700. The SEM-FEG analysis shows the uniformity of the oxide surface and the prediction of the presence of CNTs, …
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Graphene Based Chemical and IR Sensors and Correlated Carrier Transport
… epitaxial graphene grown on SiC substrates by graphitization has been shown to be quite satisfactory both in terms of quality and reliability. Graphene on SiC substrate offers the added advantage of integrating sensors and readout circuits on the same chip, that are also suitable for harsh …
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Investigation of Alkali Metal-Host Interactions and Electrode-Electrolyte Interfacial Chemistries for Lean Lithium and Sodium Metal Batteries
… a CNF electrode designed with a higher degree of graphitization and probing the interacting mechanism of Li and Na with the CNF host. Characterization of the CNF properties found the material to be more reminiscent of hard carbon materials. Electrochemical analysis showed better long-term …
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From Micro- to Nano-porous Cellular Materials with Layered 2D Microstructure
… of the material. Furthermore, efficient graphitization was demonstrated through the use of an electrolessly deposited Nickel film, resulting in the formation of a conductive multilayer graphenic coating at temperatures below 1100°C. These processes present the flexible production of …
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Synthesis and characterization of nanostructured materials for Li-ion secondary batteries
… presented higher homogeneity and degree of graphitization. When the choice of the reaction conditions was carefully controlled, the resulting material showed outstanding electrochemical results: the increased performance, particularly registered at extremely high discharge rates (even as …
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Integrated Catalytic Fabrication Approaches for Graphene-Based Electronic Devices
Catalytic Chemical Vapour Deposition (CCVD) of graphene is the most promising production method of large-area, high-quality graphene. However, the required transfer step from the metal growth substrate to the desired dielectric substrate is a major bottleneck for the integrated manufacturing of …