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 16 of 16 for “"carbothermal"”.
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Electrolysis of Molten Polyphosphate Salts Generates P₄ and O₂: Selectivity, Kinetics and Stability Behind a Promising Alternative to Carbothermal Phosphate Reduction
… industries, but it is currently produced via a carbothermal reduction rife with environmental and efficiency problems. In this work, we use the molten salt electrolysis of sodium polyphosphates to investigate an alternative means of white phosphorus production. In order to collect robust and …
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Analysis of lunar oxygen production methods under varying lunar conditions
… that will be researched: hydrothermal reduction, carbothermal reduction, and water/ice electrolysis. Transportation from the Earth is also noted as a basis of comparison. These three methods were chosen because they are the three simplest, most studied methods of regolith reduction to produce …
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A novel mechanism for metal alloying at the nanoscale
… To validate the theory, we developed a facile carbothermal shock (CTS) method to synthesize a wide range of multicomponent (up to eight dissimilar elements) nanoparticles with a desired chemistry (composition), size, and phase (solid solution, phase-separated) by controlling the CTS parameters …
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Solution-based synthesis and processing of nanocrystalline ZrB₂-based composites
… powders after suitable pyrolysis and borothermal/carbothermal reduction heat treatments. Single-phase ZrB₂ powders were prepared with initial composition of C/Zr = 4.8 and B/Zr = 3.0. ZrB₂-based composite powders with ZrC, ZrO₂, TaB₂, TaC, SiC, TaSi₂ and B₄C were prepared with particle sizes of …
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The growth and characterisation of ordered arrays of zinc oxide nanostructures and optical studies of defects in zinc oxide
… by seeding and chemical bath deposition (CBD), carbothermal vapour phase transport (CTR-VPT) and a hybrid CBD / CTR-VPT method. The best optical quality nanorods were obtained by the hybrid CBD / CTR-VPT method. This hybrid method was extended further and a method was developed to deposit …
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NOVEL SYNTHETIC METHODS AND APPLICATIONS OF POROUS MATERIALS: AEROGEL FOAMS, METALLIC AEROGELS, AMORPHOUS AND GRAPHITIC CARBON AEROGELS
… cobaltia xerogel powder compacts via carbothermal reduction, for application as thermites. III. Carbon aerogels were synthesized from compressed compacts of polyurea- and polyacrylonitrile-crosslinked silica xerogel powders. The process of making aerogels-via-xerogels allows to …
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Aerogels for energy storage applications: From shape memory materials to thermites and explosives
… of nanoporous metallic iron (Fe(0)) aerogels via carbothermal reduction of interpenetrating networks of polybenzoxazine and iron oxide nanoparticles. Excess carbon was removed oxidatively at 600 ⁰C under flowing air and the oxides of Fe(0) thus produced in the oxidative step were reduced back to …
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Towards Sustainable Electrosynthesis of Industrially Valuable Small Molecules
… chemical currently generated by energy-intensive carbothermal reduction. We demonstrate that the reduction of phosphate to phosphorus occurs near the limit of energetic and atom efficiency, portending future application as a milder and possibly carbon-neutral route for industrial phosphorus …
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NOVEL NANOMATERIALS FOR ENERGY RELATED APPLICATIONS
… TiC nanofibers were successfully synthesized by carbothermal reduction of electrospun titanium based nanofibers. XRD and HR-TEM analysis results indicated the synthesized nanofibers were composed of high purity TiC. Electric conductivity of a single fiber was in the 2.00×10^5 range. Symmetrical …
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Fundamental Understanding and Functionality of Silicon Oxycarbide
… of SiOC was proved to be predominant than local carbothermal reduction. In addition to these findings, a novel approach was developed through the Gibbs free energy minimization method to predict the phase content in PDCs with transition metal additives. And this work provides useful guidance to …
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Characterisation of silica in Equisetum hyemale and its transformation into biomorphous ceramics
… thesis demonstrates the principal possibility of carbothermal synthesis of SiC from E.hyemale with the prospect of potential applications, for instance as refractory materials, catalyst supports, or high performance advanced ceramics.
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Zinc oxide nanophotonics : toward quantum photonic technologies
… ranging from 3 μm to 15 μm were grown by a carbothermal reduction method. Optical characterization of ZnO microdisks was performed using low temperature (80 K) CL imaging and spectroscopy. The green emission is found to be locally distributed near the hexagonal boundary of the ZnO …
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Wide band-gap nanowires for light emitting diodes
… at high temperatures. Due to dependency of the carbothermal reduction of ZnO powder, which acts as the precursor source in the growth, the nanowire areal density was dependent on O2 flow. At low nanowire areal density, growth proceeded in a regime in which continuous nucleation of nanowires …
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Synthesis and characterization of transition metal nitrides and carbides for catalysis and electrochemistry application
It was the goal of this work to explore two different synthesis pathways using green chemistry. The first part of this thesis is focusing on the use of the urea-glass route towards single phase manganese nitride and manganese nitride/oxide nano-composites embedded in carbon, while the second part …
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Carbon Supported Metal Carbide Catalysts for the Reduction of Carbon Dioxide
Development of active and selective catalysts for the conversion of CO2 into valuable products is a promising strategy for reducing the environmental impact of CO2 released from the use of fossil fuels. The manufacture of these catalysts should also consider the use of waste materials and reduction …
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Chlorination of Titanium Oxycarbide and Oxycarbonitride
The project undertook a systematic study of chlorination of titanium oxycarbide and oxycarbonitride with the aim to develop further understanding of kinetics and mechanisms of the chlorination reactions. The project studied titania, ilmenite ores, and synthetic rutile reduced by carbon in argon and …