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ON THE APPLICATION OF SAFT TO MODEL FLUID-FLUID BEHAVIOR OF SOLVENT+ NON-ADSORBING POLYMER+NANOPARTICLE MIXTURES
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- Author / Creator
- Remy, Quentin C. J.-M.
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Ternary mixtures comprising cyclohexane + polystyrene + silica nanoparticles were recently shown to exhibit a closed loop two-phase region comprising colloid-gas and colloid-liquid phases1. This two-phase region is surrounded by single-phase colloid-gas and colloid-liquid phase regions and there are two colloid-gas colloid-liquid critical points along the two-phase to one-phase boundary. One of the critical points, C1, is essentially temperature invariant. The other critical point, C2, is temperature dependent and its placement impacts the shape and size of the two-phase region significantly as temperature is varied. The presence and impact of this second critical point in these phase diagrams has yet to be modelled for this example or in general, and the need to discriminate depletion interaction and depletion flocculation is underscored. Engineering tools are needed for process design and process operation optimization that include such mixtures. In this work, the experimental results and their basis are rehearsed, and a Statistical Associating Fluid
Theory (SAFT) based model comprising: spheres of different size to represent the solvent, and the nanoparticles, and chains of spheres to represent the polymer, is described and then evaluated for this application. Qualitative, and quantitative outcomes are presented, and model limitations and required future work are discussed. -
- Graduation date
- Fall 2018
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.