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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 22 for “"transition metal carbides"”.
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Hydrogen Chemisorption and Oxidation on Transition Metal Carbides
Made available in DSpace on 2014-12-14T15:24:03Z (GMT). No. of bitstreams: 1 8004134.pdf: 3664469 bytes, checksum: 930bba133afa8c68baa82325bbb4f927 (MD5) Previous issue date: 1979
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Electron energy loss spectroscopy of transition-metal carbides
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T14:57:08Z No. of bitstreams: 1 1983_allison.pdf: 3824629 bytes, checksum: c0a995c7c2bcca1cad4a44e6d628a004 (MD5)
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Electronic structure and optical properties of layered ternary transition-metal carbides and nitrides
… orbitals (OLCAO) method. These layered ternary transition-metal carbides and nitrides are also commonly referred to as "MAX phases". Trends were observed for the calculated density of states (DOS) at Fermi-level, with respect to elemental variations and number of M and X layers. A local minimum …
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Synthesis, characterization and chemistry of two-dimensional transition metal carbides and nitrides (MXenes)
… growing family of two-dimensional (2D) early transition-metal carbides and nitrides first synthesized in 2011 from bulk layered crystalline MAX phases. Because of their 2D structure and unique combination of high conductivity and hydrophilicity, MXenes have raised a significant interest for …
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Biofuels Production Via Catalytic Hydrocracking Of Ddgs Corn Oil And Hydrothermal Decarboxylation Of Oleic Acid Over Transition Metal Carbides Supported On Al-Sba-15
… grains with solubles (DDGS) corn oil over bimetallic carbide catalysts was explored for green diesel production. A catalyst composed of nickel−tungsten (Ni−W) carbide supported on Al-SBA-15 was designed based on the ability of nickel to adsorb and activate hydrogen and the potential of …
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Resistivity, Superconductivity, and Order-Disorder Transformations in Carbides and Carbohydrides
… study was to investigate electron transport in transition-metal carbides with special attention to ordering effects in substoichiometric carbides and to the influence of hydrogenation.
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Transition metal carbide and nitride nanoparticles with Noble metal shells as enhanced catalysts
… platform for enhancing the performance of noble metal catalysts while reducing the cost. Early transition metal carbides (TMCs) and nitrides (TMNs) have been identified as ideal core materials for supporting noble metal shells owing to their earth-abundance, thermal and chemical stability, …
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The influence of microstructure on the mechanical properties of some refractory compounds
… to the study of the microstructure of transition metal carbides and diborides. The local atomic structure of amorphous titanium diboride thin films, prepared by electron beam vaporization of the crystalline compound onto liquid nitrogen-cooled substrates, is examined using extended …
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Sol-gel deposition of oxide-ion conducting thin films ; and, Liquid precursors to hafnium and tantalum carbides
… and the acetate or alkoxide of the dopant metal (Me). Copper-doped films were spincoated onto nonporous quartz substrates and pyrolyzed. These were initally defect-free, but became agglomerated on heating at higher temperatures. The use of a number of different additive compounds was tried, …
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MULTIFUNCTIONAL BEHAVIORS OF TWO-DIMENSIONAL MATERIALS AND THEIR COMPOSITES
… (2D) materials, including graphene, transition metal carbides or nitrides (TMC/Ns), have rich surface chemistry, superb electrical and mechanical properties. These unique properties make them ideal for multifunctional devices. Among them, we focused on graphene and TMC/Ns (i.e., …
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Structural Characterization and Material Property Evaluation in Polymer-Derived SiOC Ceramics and Ceramic Nanocomposites
… (a rapidly growing class of two-dimensional transition metal carbides/nitrides) to create nanostructured ceramic composites. Phase formation, porosity, and electrical conductivity will be analyzed to demonstrate attractive multifunctional capabilities of SiOC ceramics. In addition, …
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Catalytic coatings for vanadium-based hydrogen membranes
… permeable alternative to palladium as a dense metallic hydrogen membrane. However, catalytic surface coatings must be applied to vanadium surfaces to enable the transport of molecular hydrogen. These coatings facilitate dissociation and recombination kinetics of molecular hydrogen and protect …
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Inkjet Printing of 2d Materials on Flexible and Rigid Substrates
2-dimensional (2d) materials such as graphene, transition metal carbides, nitrides, or carbonitrides (MXenes) and hexagonal boron nitride (h-BN) hold enormous potential for the next generation printable electronics. When these materials are formulated into inkjet printable inks, they can be …
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The impact of coating architecture on the hardness, friction and wear resistance of hard and tribological nanocomposite coatings
… coatings presented in this thesis include carbides that form a solid solution (Ti-Hf-C) as well as carbides that form composite microstructures (WC-SiC, HfC-SiC). Hardness measurements on these films indicated the potential of transition metal carbide-silicon carbide composites to be …
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Thermal conductivity and electrical resistivity of cemented carbides, titanium diboride and high temperature ceramic superconductors
… temperature ceramic superconductors, cemented transition-metal carbides and Ti~~. These interactions were studied via measurement and analysis of thermal conductivity and electrical resistivity from 15-1400 oK. It has been reported that YB8:2CU:-sO-7--,.. exhibits a significant rise in thermal …
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Synthesis, characterization, and properties of carbide dispersion-strengthened tungsten alloys for use as a plasma-facing material in nuclear fusion reactors
… is theorized that by microalloying tungsten with transition metal carbides that capture the oxygen atoms, the impurity distribution can be altered to beneficially impact the mechanical properties. Through the advent of advanced powder processing techniques such as Spark plasma sintering, dense, …
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Microstructural formations and phase transformation pathways in tantalum carbides
Transition metal carbides have a large assortment of applications because of their high hardness, chemical resistance, and high melting temperatures. Tantalum carbide (TaC) and its sub-stoichiometric Ta2C and Ta4C3 phases have emerged as candidate materials for ultra-high temperature structural …
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Deciphering the role of dispersoids in dispersion-strengthened tungsten alloys on the mechanical properties and irradiation- driven response under nuclear fusion reactor-relevant conditions
… is theorized that by microalloying tungsten with transition metal carbides that capture the oxygen atoms, the impurity distribution can be altered to beneficially impact the mechanical properties. Additionally, altering the interface concentration and type can increase the irradiation tolerance of …
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Multilayer solar selective coatings for high temperature solar applications: from concept to design
… Dresden - Rossendorf) and the SME Metal Estalki. The improvement in efficiencies in solar thermal energy plants partially means the increase in the receivers’ temperature, reaching up to an average maximum temperature of 650ºC for superheated steam and molten salts receivers. There …
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