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The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes
The aim of the study was to synthesise iron oxide crystallites with different crystallite sizes supported on y-A120 3 using the reverse micelle technique. It was hypothesised that changing the crystallite size of the synthesised iron oxide crystallites could lead to the control of the external nanot...
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| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2014
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| _version_ | 1867614362928152576 |
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| access_status_str | Open Access |
| author | Kleinsmidt, Jacques N |
| author2 | Van Steen, Eric |
| author_browse | Kleinsmidt, Jacques N Van Steen, Eric |
| author_facet | Van Steen, Eric Kleinsmidt, Jacques N |
| author_sort | Kleinsmidt, Jacques N |
| collection | Thesis |
| description | The aim of the study was to synthesise iron oxide crystallites with different crystallite sizes supported on y-A120 3 using the reverse micelle technique. It was hypothesised that changing the crystallite size of the synthesised iron oxide crystallites could lead to the control of the external nanotube diameter. The effect of temperature on the external diameter and productivity was also investigated. It was found through titration and AAS that the iron loading was lower than the expected 15 wt.-%. Furthermore, it was observed that the loading was not consistent through different catalyst samples. This was attributed to incomplete precipitation of iron using the reverse micelle technique, the rigorous cleaning regime implemented and weak metal-support interaction. It was found through XRD and TEM that crystallites in the nanometre range were produced although they were not well distributed over the support. It was also found that the expected linear relationship between water to surfactant ratio and crystallite size was not achieved. Hence the obtained crystallite sizes were significantly different from those obtained in the work by Mabaso. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/6695 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:50:50.876Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/6695 The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes Kleinsmidt, Jacques N Van Steen, Eric Chemical Engineering The aim of the study was to synthesise iron oxide crystallites with different crystallite sizes supported on y-A120 3 using the reverse micelle technique. It was hypothesised that changing the crystallite size of the synthesised iron oxide crystallites could lead to the control of the external nanotube diameter. The effect of temperature on the external diameter and productivity was also investigated. It was found through titration and AAS that the iron loading was lower than the expected 15 wt.-%. Furthermore, it was observed that the loading was not consistent through different catalyst samples. This was attributed to incomplete precipitation of iron using the reverse micelle technique, the rigorous cleaning regime implemented and weak metal-support interaction. It was found through XRD and TEM that crystallites in the nanometre range were produced although they were not well distributed over the support. It was also found that the expected linear relationship between water to surfactant ratio and crystallite size was not achieved. Hence the obtained crystallite sizes were significantly different from those obtained in the work by Mabaso. 2014-08-28T09:15:57Z 2014-08-28T09:15:57Z 2005 Master Thesis Masters MSc http://hdl.handle.net/11427/6695 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Kleinsmidt, Jacques N The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| thesis_degree_str | Master's |
| title | The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| title_full | The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| title_fullStr | The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| title_full_unstemmed | The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| title_short | The effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| title_sort | effect of temperature and crystallite size on the growth and morphology of carbon nanotubes |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/6695 |
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