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Modification of LAPONITE® Clay by covalent and non-covalent methods
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McGinley, Sarah-Jayne (2023) Modification of LAPONITE® Clay by covalent and non-covalent methods. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3978603
Abstract
Within this thesis various methodologies are explored for preparing LAPONITE® nanocomposite materials, primarily through covalent modification routes. Firstly, the traditional modification of LAPONITE® clay with dimethylethoxy-vinylsilane in organic solvent to edge modify the clay discs is investigated and the kinetics of this reaction probed. The modified clay is further chain extended through a hydrosilylation reaction with the dangling vinyl groups to hydrophobise the clay further. Next, a water-based method of synthesis was explored, deducing the impact of LAPONITE® discs on the formation of particles from vinyltrimethoxysilane in aqueous solution, to determine if nanocomposite materials are formed. The role of the LAPONITE® was investigated by probing the final particles and monitoring the formation of particles through dynamic light scattering. The insight gained from these experiments was then applied to prepare LAPONITE®-silane particles. This was carried out by reducing the size of water domains by switching to an inverse mini-emulsion system and increasing the clay loading in the aqueous droplets. This forced the clay discs to partake in the condensation reaction with the silane upon entry to the aqueous droplets, preparing clay-silane particles. Following this, a different approach was also trialled of a slurry based method to prepare much larger nanocomposite materials. The recipe was tuned to allow for different functionalities and routes of post-processing were explored. Finally, physical adsorption of hydrophobic compounds to LAPONITE® was explored to allow dispersion and application of water-insoluble molecules in an aqueous solution.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Nanocomposites (Materials), Clay -- Testing, Silylation, Hydrosilylation, Materials -- Testing, Siloxanes, Adsorption | ||||
Official Date: | March 2023 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Chemistry | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Bon, Stefan Antonius Franciscus | ||||
Format of File: | |||||
Extent: | xxiv, 197 pages : colour illustrations | ||||
Language: | eng |
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