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 13 of 13 for “"floating catalyst"”.
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Modelling the floating-catalyst method for carbon nanotube production
… the nucleation, growth and evaporation of the catalyst nanoparticles in the reactor is investigated. A simple particle model that can quantitatively describe the mass fraction of the particles in the flow is developed. This model is first applied to predict how the radial particle mass fraction …
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Manufacturing strategy for high current cold field emission cathodes: Floating catalyst chemical vapour deposition grown carbon nanotube fibres and films enhanced by laser patterning and laser purification process
… fibres (∅~7-10 µm) and films (h~30 µm), using a floating catalyst chemical vapour deposition process which produces high quantities of CNT material with mixed mechanical and electrical properties. The material is difficult to handle because of its dimensions and is susceptible to environmental …
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Selective area synthesis of 3-D carbon nanotube forest microsctructures
… The CVD process of both techniques require a catalyst nanoparticle to facilitate CNT growth and a hydrocarbon gaseous precursor. Floating catalyst CVD, a process in which CNT catalyst is delivered to a substrate in the vapor state, is compatible with oxide-coated substrates and not compatible …
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Quantitative Chemical Analysis Throughout the FC CVD Process as a Route to Reliable Fibre Production and Research
Carbon nanotube fibre production through the Floating Catalyst – Chemical Vapour Deposition (FC-CVD) process has been developed at Cambridge University for 14 years by the Macromolecular Materials Laboratory (MML) group. Since then research has focused on lab-scale processes and fibre property …
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Aerosol carbon nanotube production via scalable microplasma synthesis of catalyst nanoparticles
… those properties into macroscale structures. Floating catalyst chemical vapor deposition (FC-CVD) has emerged as the most promising process for large-scale production with an increasing number of commercial uses. Yet, FC-CVD still requires improvements in control (i.e., reliability and CNT …
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Development and Application of Gas-phase Raman Spectroscopy Techniques for Analysis of Carbon Nanotube Synthesis Processes
… be produced via different techniques, with the floating catalyst chemical vapour deposition (FC-CVD) being one of the most attractive solutions for the mass production of CNTs. The current production rate of high-quality CNT material with tailored properties falls short of the rising industrial …
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Development of an internally heated FC-CVD reactor for CNT synthesis
… method to synthesise CNT textiles is known as floating catalyst chemical vapor deposition (FC-CVD) which generates some of the highest quality CNTs directly into the final form from the reactor. However, it was found that FC-CVD is not readily scalable with a low production rate per volume of …
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Advancing Direct-Spun Carbon Nanotube Textiles, From Field Alignment to Innovative Applications
… CNTs in situ during the CNT bundling phase in a floating catalyst CVD reactor. The resulting bulk CNT textiles demonstrated an increase in the specific electrical and tensile properties (up to 90 and 460%, respectively) without modifying the quantity or quality of the CNTs, as verified by …
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Characterisation and development of carbon nanotube macrostructures
… between CNTs and the final materials. The Floating Catalyst Chemical Vapour Deposition (FC-CVD) route in particular has been reviewed in detail as the production method for CNT materials investigated in this work. The different processing paths that these materials have undergone …
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Characterization, Processing, and Synthesis of Extreme-Performance Continuous Carbon Nanotube Network Composites
… CNT yarns fabricated through floating-catalyst chemical vapor deposition (FCCVD) as model systems, we first explore yarn characteristics which are unique to their hierarchical, bundled-fiber structure, placing focus on the oxygen-rich amorphous carbon phase found in …
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On the Dynamics within a Gas Phase Process for Continuous Carbon Nanotube Synthesis
… potential for a variety of applications. The floating catalyst chemical vapour deposition (FCCVD) method discussed in this dissertation bridges the gap between generating nano- and macro-scale CNT material and has already been adopted by industry for exploitation. A deep understanding of the …
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An Investigation of Carbon Nanotube Synthesis: Modelling and Experiments
… for producing CNTs on an industrial scale. The floating catalyst chemical vapour deposition (FCCVD) method has been widely accepted as a promising technique for mass production of CNTs. Despite the recent progress in improving the technique, a lack of fundamental understanding of the limiting …
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Synthesis of Carbon Nanotube Materials from a Microwave Plasma
Carbon nanotubes (CNTs) possess numerous exceptional structural, thermal, and electrical properties that have the potential to be highly disruptive and impactful in many areas of technology. Unfortunately, synthesis methods of CNT-containing materials are often complex, expensive, and require …