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A theoretical and empirical investigation into the growth of ultralong carbon nanotubes / KA YICK

Swansea University Author: KA YICK

DOI (Published version): 10.23889/SUthesis.63623

Abstract

Carbon nanotubes (CNTs) were first discovered and named as such by Iijima in 1991. Various institutes and researchers have since widely conducted ongoing research on carbon nanotube growth. The exceptional properties of CNTs, including their electrical and mechanical properties, aim to revolutionise...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: White, Alvin O.
URI: https://cronfa.swan.ac.uk/Record/cronfa63623
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first_indexed 2023-06-13T09:06:05Z
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spelling v2 63623 2023-06-13 A theoretical and empirical investigation into the growth of ultralong carbon nanotubes c5013d1d22794414f006b1b8e4be56fb KA YICK KA YICK true false 2023-06-13 Carbon nanotubes (CNTs) were first discovered and named as such by Iijima in 1991. Various institutes and researchers have since widely conducted ongoing research on carbon nanotube growth. The exceptional properties of CNTs, including their electrical and mechanical properties, aim to revolutionise the applications of electronics and devices in the future such as transmission power lines and lightweight high-strength carbon nanotube fibres. Therefore, understanding the mechanisms of growing ultra-long carbon nanotubes (UL-CNTs) that can increase the length to more than a centimetre long can unlock the full potential of the CNTs. This PhD project will have three parts: (Ⅰ) the growth experiments using different types of monometallic & bimetallic iron based catalysts for growing carbon nanotubes; (Ⅱ) the computational simulation of flow fields around carbon nanotube geometry in a micro-scale; (Ⅲ) the applications of carbon nanotubes produced from waste plastics, such as Ethernet & audio cables, and public engagement events about the research. In the growth experiment topic, the primary objective of this research is to study the catalyst activities on the rate of carbon nanotube growth using monometallic (Fe) & bimetallic catalysts (Fe-Cu, Fe-Co, Fe-Ni, Fe-Sn, Fe-Ga, Fe-Mg & Fe-Al) dissolved in deionised water, and find which catalysts have the potential to grow the longest carbon nanotubes with improved characteristics, such as G/D (graphene/ disorders) ratio. As we know, the carbon source gas flow rate and reactor temperature profiles can affect the length of carbon nanotubes from the literature; an effective way to optimise experimental conditions to grow UL-CNTs is to use computational fluid dynamics (CFD) modelling methods. So far, there has been little research on the growth of ultra-long carbon nanotubes under a non-continuous flow environment on a nanoscale. Most computational modelling studies have only focused on the continuity of flow in a traditional approach. This research uses the BGK-Boltzmann equation and molecular collision models to investigate flow behaviours at the nanoscopic scale. Thus, this study provides an exciting opportunity to advance the knowledge of growing ultra-long carbon nanotubes (UL-CNTs) of centimetre length or higher and may be used in applications including the carbon nanotube Ethernet and audio cables as mentioned in this project. E-Thesis Swansea, Wales, UK Carbon nanotubes, Chemical Vapour Deposition (CVD) 24 4 2023 2023-04-24 10.23889/SUthesis.63623 COLLEGE NANME COLLEGE CODE Swansea University White, Alvin O. Doctoral Ph.D Welsh Government Circular Economy Capital Fund (FY 2020–21) 2024-04-22T14:44:09.6337563 2023-06-13T10:02:46.1175554 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering KA YICK 1 63623__27812__0c913fb139c440c5a5b13a7fcb78cc6e.pdf 2023_Yick_T.final.63623.pdf 2023-06-13T10:07:13.9661470 Output 4566314 application/pdf E-Thesis – open access true Copyright: The Author, Timothy Yick, 2023. true eng
title A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
spellingShingle A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
KA YICK
title_short A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
title_full A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
title_fullStr A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
title_full_unstemmed A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
title_sort A theoretical and empirical investigation into the growth of ultralong carbon nanotubes
author_id_str_mv c5013d1d22794414f006b1b8e4be56fb
author_id_fullname_str_mv c5013d1d22794414f006b1b8e4be56fb_***_KA YICK
author KA YICK
author2 KA YICK
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publishDate 2023
institution Swansea University
doi_str_mv 10.23889/SUthesis.63623
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
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description Carbon nanotubes (CNTs) were first discovered and named as such by Iijima in 1991. Various institutes and researchers have since widely conducted ongoing research on carbon nanotube growth. The exceptional properties of CNTs, including their electrical and mechanical properties, aim to revolutionise the applications of electronics and devices in the future such as transmission power lines and lightweight high-strength carbon nanotube fibres. Therefore, understanding the mechanisms of growing ultra-long carbon nanotubes (UL-CNTs) that can increase the length to more than a centimetre long can unlock the full potential of the CNTs. This PhD project will have three parts: (Ⅰ) the growth experiments using different types of monometallic & bimetallic iron based catalysts for growing carbon nanotubes; (Ⅱ) the computational simulation of flow fields around carbon nanotube geometry in a micro-scale; (Ⅲ) the applications of carbon nanotubes produced from waste plastics, such as Ethernet & audio cables, and public engagement events about the research. In the growth experiment topic, the primary objective of this research is to study the catalyst activities on the rate of carbon nanotube growth using monometallic (Fe) & bimetallic catalysts (Fe-Cu, Fe-Co, Fe-Ni, Fe-Sn, Fe-Ga, Fe-Mg & Fe-Al) dissolved in deionised water, and find which catalysts have the potential to grow the longest carbon nanotubes with improved characteristics, such as G/D (graphene/ disorders) ratio. As we know, the carbon source gas flow rate and reactor temperature profiles can affect the length of carbon nanotubes from the literature; an effective way to optimise experimental conditions to grow UL-CNTs is to use computational fluid dynamics (CFD) modelling methods. So far, there has been little research on the growth of ultra-long carbon nanotubes under a non-continuous flow environment on a nanoscale. Most computational modelling studies have only focused on the continuity of flow in a traditional approach. This research uses the BGK-Boltzmann equation and molecular collision models to investigate flow behaviours at the nanoscopic scale. Thus, this study provides an exciting opportunity to advance the knowledge of growing ultra-long carbon nanotubes (UL-CNTs) of centimetre length or higher and may be used in applications including the carbon nanotube Ethernet and audio cables as mentioned in this project.
published_date 2023-04-24T14:44:06Z
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score 11.035655

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