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Permanent link (DOI): https://doi.org/10.7939/R3D21RS21

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Total Internal Reflection Fluorescence Microscopy to Study Bitumen and Clay Interaction in Oil Sands Tailings Open Access

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Other title
Subject/Keyword
Oil sands tailings
residual bitumen in tailings
Fluorescence
Total Internal Reflection Fluorescence Microscopy
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Shende, Swapnali
Supervisor and department
Nazemifard, Neda (Chemical and Materials Engineering)
Jacob, Zubin (Electrical and Computer Engineering)
Examining committee member and department
Nazemifard, Neda (Chemical and Materials Engineering)
Jacob, Zubin (Electrical and Computer Engineering)
Liu, Qi (Chemical and Materials Engineering)
McCaffrey, William (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2016-09-29T10:18:16Z
Graduation date
2016-06:Fall 2016
Degree
Master of Science
Degree level
Master's
Abstract
Oil sands tailings management remains to be a major challenge for oil industry in Canada. Promoting quick settling of fines in tailings ponds is the key to its treatment. Bitumen lost to tailings during oil sands extraction is also believed to hinder settling and consolidation of clays in tailings ponds. Complete understanding of the factors that impede fast settling of tailings would be the ground work for development of improved tailings settling techniques and flocculants. In this study, bitumen-clay association and effect of bitumen on clay particle-particle interactions in mature fine tailings (MFT) is investigated with Total Internal Reflection Fluorescence (TIRF) microscope among other techniques. Bitumen displays natural fluorescence when illuminated with 488 nm and 543 nm. This was also established using spectrofluorometer. Fluorescence microscope imaging, ensured that clay and water did not show fluorescence. These outcomes along with high axial resolution and high contrast of TIRF were utilized to understand how bitumen interacts with clay surface in MFT. MFT sample were also diluted with process water and deionized water separately, to recognize clay boundaries under bright field microscope. The presence of hydrophobic fine clay agglomerates along with the hydrophilic clay particles was apparent from the TIRF results. Bitumen was detected to be coating clay particles and bridging clay agglomerates. By reducing the laser intensity, at laser angle above critical angle, bitumen was observed to be only partially coating some clay surfaces. The existence of biwettable clays in MFT was evident in these images. Confocal Laser scanning microscope (CLSM) which also gives high contrast images with controlled depth of field, confirmed the presence of non-uniform bitumen coating in clay surfaces. At 0.21 µm resolution, no free bitumen could be apprehended. Using He-ion microscope (HIM) which gives resolution up to 0.25 nm and high surface sensitivity, preliminary MFT images were obtained to clearly witness the layered structure of clays. Correlative studies with HIM and TIRF will pave way to realize the clay surface properties that are partially coated with bitumen.
Language
English
DOI
doi:10.7939/R3D21RS21
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Shende, S., Pendharker, S., Nazemifard, N., & Jacob, Z. (2016). Total Internal Reflection Fluorescence Microscopy To Investigate the Distribution of Residual Bitumen in Oil Sands Tailings. Energy & Fuels.Shende, S., Pendharker, S., Nazemifard, N., & Jacob, Z. (2016). Total Internal Reflection Fluorescence Tomography to Study Bitumen and Clay interaction in Oil Sands Tailings. Fuels.

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