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Studying humid creep inhibitors of gypsum plaster with electrochemical and analytical technique
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Scott, Tom (2020) Studying humid creep inhibitors of gypsum plaster with electrochemical and analytical technique. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3759546
Abstract
This thesis is concerned with the humid creep mechanism of gypsum plaster, and how additives inhibit this effect. The crystallisation and dissolution of gypsum are studied under these additive effects in a collaborative project sponsored by Saint-Gobain Gypsum.
Multiple approaches are taken to understand the additive effects, studying the crystallisation, dissolution and wetting of gypsum. The crystal behaviour was studied through a simple droplet evaporation experiment, with the formed crystals studied by SEM. Nanoprecipitation was employed using a SICM setup which allows the study of the very early stages of nucleation as well as the dissolution of gypsum, allowing for repeat experiments and good statistical analysis of the crystallisation and dissolution. To study plaster wetting, a SECCM setup was utilised to allow controlled application of water droplets to a plaster surface, and the wetting analysed through a video setup coupled with advanced image software and custom-made programmes. Analytical methods are employed throughout, including Raman spectroscopy, powder X-ray diffraction and BET theory to characterise gypsum and its porosity. These studies led to the investigation of new potential anti-sag additives, which yielded the untested fluorescein. Its effect on the sag of gypsum plaster is explored and the potential uses as a unique tag in plaster explained, with fluorescence microscopy utilised to show how additives are incorporated in gypsum.
To demonstrate the effectiveness of the nanoprecipitation technique further, crystallisation of the MOF HKUST-1 was performed. The unique advantages of nanoprecipitation give new proof to the proposed literature mechanism of HKUST-1, which depends on the copper precursor used as a reagent. Finite element method simulations were employed alongside both nanoprecipitation setups in order to quantify the supersaturation of gypsum and HKUST-1 respectively.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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Library of Congress Subject Headings (LCSH): | Drywall, Gypsum -- Dissolution, Humidity -- Control, Crystallization, Nucleation | ||||
Official Date: | January 2020 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Chemistry | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Unwin, Patrick R. ; Walton, Richard I. | ||||
Format of File: | |||||
Extent: | xiii, 196 leaves : illustrations | ||||
Language: | eng |
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