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Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis / NIA WANNELL

Swansea University Author: NIA WANNELL

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DOI (Published version): 10.23889/SUthesis.58754

Abstract

Interest in halloysite clay minerals has increased steadily over the last 20+ years, in part, due to their nanotubular shape and size, high aspect ratio and potential technological applications (Churchman et al., 2016). Throughout this thesis the surface chemistry of halloysite nanotubes is investig...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Holliman, Peter. ; Hillier, Steve. ; Greenwell, Chris
URI: https://cronfa.swan.ac.uk/Record/cronfa58754
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first_indexed 2021-11-23T17:51:41Z
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Throughout this thesis the surface chemistry of halloysite nanotubes is investigated by employing several analytical and advanced microscopy techniques to obtain a greater understanding of their internal and external surface features and surface adsorption reactions. This multifaceted analysis approach investigates a range of tubular halloysites of two morphologies, cylindrical and polygonal prismatic, where comparison of the two forms a framework for the presentation and discussion of the results. The results presented in Chapter 3 demonstrate the phosphate adsorption capacity of halloysite nanotubes is influenced by pH and maximum adsorptions of 1.3 mg/g and 0.5 mg/g were obtained for the cylindrical and polygonal prismatic morphologies respectively. Use of advanced microscopy techniques in Chapter 4 showed the external surface of the polygonal prismatic nanotubes have multiple steps and edges, which may act as additional adsorption sites, as has been shown for other clay minerals (Siretanu et al., 2016). In addition, use of cross-section transmission electron microscopy provided evidence of the link between the two morphologies, where the cylindrical nanotubes appear to be the template from which the larger polygonal prismatic nanotubes grow, as previously postulated by Hillier et al. (2016). In further novel work (Chapter 5), gold nanotags have been functionalised with a variety of anionic and neutral terminated linkers and used as nanoscale probes to study adsorption to the surface of halloysite nanotubes Here, transmission electron microscopy proved that the adsorption occurred primarily on the nanotube inner lumen and edges. The final technical chapter, Chapter 6, focuses on the structure and dynamics of interlayer water in halloysite through the use of neutron scattering techniques, where the initial results demonstrated that the interlayer water appears to move via both rotations and translations within the interlayer. The research presented ascertains that the surfaces of the halloysite nanotubes are more complex than often depicted for technological applications and that the specific tubular morphology is important in the functionality and behaviour of the nanotubes. 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spelling v2 58754 2021-11-23 Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis 8d4777f7b296f875ad09b8a720378634 NIA WANNELL NIA WANNELL true false 2021-11-23 Interest in halloysite clay minerals has increased steadily over the last 20+ years, in part, due to their nanotubular shape and size, high aspect ratio and potential technological applications (Churchman et al., 2016). Throughout this thesis the surface chemistry of halloysite nanotubes is investigated by employing several analytical and advanced microscopy techniques to obtain a greater understanding of their internal and external surface features and surface adsorption reactions. This multifaceted analysis approach investigates a range of tubular halloysites of two morphologies, cylindrical and polygonal prismatic, where comparison of the two forms a framework for the presentation and discussion of the results. The results presented in Chapter 3 demonstrate the phosphate adsorption capacity of halloysite nanotubes is influenced by pH and maximum adsorptions of 1.3 mg/g and 0.5 mg/g were obtained for the cylindrical and polygonal prismatic morphologies respectively. Use of advanced microscopy techniques in Chapter 4 showed the external surface of the polygonal prismatic nanotubes have multiple steps and edges, which may act as additional adsorption sites, as has been shown for other clay minerals (Siretanu et al., 2016). In addition, use of cross-section transmission electron microscopy provided evidence of the link between the two morphologies, where the cylindrical nanotubes appear to be the template from which the larger polygonal prismatic nanotubes grow, as previously postulated by Hillier et al. (2016). In further novel work (Chapter 5), gold nanotags have been functionalised with a variety of anionic and neutral terminated linkers and used as nanoscale probes to study adsorption to the surface of halloysite nanotubes Here, transmission electron microscopy proved that the adsorption occurred primarily on the nanotube inner lumen and edges. The final technical chapter, Chapter 6, focuses on the structure and dynamics of interlayer water in halloysite through the use of neutron scattering techniques, where the initial results demonstrated that the interlayer water appears to move via both rotations and translations within the interlayer. The research presented ascertains that the surfaces of the halloysite nanotubes are more complex than often depicted for technological applications and that the specific tubular morphology is important in the functionality and behaviour of the nanotubes. This fundamental work contributes towards optimisation of halloysite nanotubes for technological applications. E-Thesis Swansea Halloysite nanotube, clay mineral, surface chemistry, surface imaging, phosphate adsorption 23 11 2021 2021-11-23 10.23889/SUthesis.58754 ORCiD identifier: https://orcid.org/0000-0002-8252-5382 COLLEGE NANME COLLEGE CODE Swansea University Holliman, Peter. ; Hillier, Steve. ; Greenwell, Chris Doctoral Ph.D Macaulay Development Trust 2024-05-08T11:32:59.8868340 2021-11-23T17:49:00.5181061 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised NIA WANNELL 1 58754__21649__dda60fad7f1e427f894fa70d213be2ab.pdf Gray-Wannell_Nia_B_PhD_Thesis_Final_Redacted_Signature.pdf 2021-11-23T18:00:56.2886166 Output 18989929 application/pdf E-Thesis – open access true Copyright: The author, Nia B. Gray-Wannell, 2021. true eng
title Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
spellingShingle Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
NIA WANNELL
title_short Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
title_full Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
title_fullStr Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
title_full_unstemmed Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
title_sort Surface Chemistry of Halloysite Nanotubes. As investigated by adsorption reactions and imaging analysis
author_id_str_mv 8d4777f7b296f875ad09b8a720378634
author_id_fullname_str_mv 8d4777f7b296f875ad09b8a720378634_***_NIA WANNELL
author NIA WANNELL
author2 NIA WANNELL
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publishDate 2021
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doi_str_mv 10.23889/SUthesis.58754
college_str Faculty of Science and Engineering
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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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
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description Interest in halloysite clay minerals has increased steadily over the last 20+ years, in part, due to their nanotubular shape and size, high aspect ratio and potential technological applications (Churchman et al., 2016). Throughout this thesis the surface chemistry of halloysite nanotubes is investigated by employing several analytical and advanced microscopy techniques to obtain a greater understanding of their internal and external surface features and surface adsorption reactions. This multifaceted analysis approach investigates a range of tubular halloysites of two morphologies, cylindrical and polygonal prismatic, where comparison of the two forms a framework for the presentation and discussion of the results. The results presented in Chapter 3 demonstrate the phosphate adsorption capacity of halloysite nanotubes is influenced by pH and maximum adsorptions of 1.3 mg/g and 0.5 mg/g were obtained for the cylindrical and polygonal prismatic morphologies respectively. Use of advanced microscopy techniques in Chapter 4 showed the external surface of the polygonal prismatic nanotubes have multiple steps and edges, which may act as additional adsorption sites, as has been shown for other clay minerals (Siretanu et al., 2016). In addition, use of cross-section transmission electron microscopy provided evidence of the link between the two morphologies, where the cylindrical nanotubes appear to be the template from which the larger polygonal prismatic nanotubes grow, as previously postulated by Hillier et al. (2016). In further novel work (Chapter 5), gold nanotags have been functionalised with a variety of anionic and neutral terminated linkers and used as nanoscale probes to study adsorption to the surface of halloysite nanotubes Here, transmission electron microscopy proved that the adsorption occurred primarily on the nanotube inner lumen and edges. The final technical chapter, Chapter 6, focuses on the structure and dynamics of interlayer water in halloysite through the use of neutron scattering techniques, where the initial results demonstrated that the interlayer water appears to move via both rotations and translations within the interlayer. The research presented ascertains that the surfaces of the halloysite nanotubes are more complex than often depicted for technological applications and that the specific tubular morphology is important in the functionality and behaviour of the nanotubes. This fundamental work contributes towards optimisation of halloysite nanotubes for technological applications.
published_date 2021-11-23T11:32:59Z
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