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Permanent link (DOI): https://doi.org/10.7939/R3W39C

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Microstructural Characterization of Asphaltenes on Surfaces Open Access

Descriptions

Other title
Subject/Keyword
Atomic Force Microscopy
Asphaltenes
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Mehranfar, Mahsa
Supervisor and department
Thundat, Thomas (Chemical and Materials Engineering)
Examining committee member and department
Shaw, John (Chemical and Materials Engineering)
Mitra, Sushanta (Mechanical Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2014-01-28T10:48:36Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Crude oils contain a distribution of molecules with diverse chemical structures and molecular weights. Asphaltenes are considered the most problematic of these structures. We have investigated the adsorption and aggregation of asphaltenes on surfaces using scanning probe microscopy. Modifying the chemical properties of surfaces using self-assembled monolayers (SAM) can change the wettability and adsorption characteristics of molecules. We have investigated adsorption of asphaltenes on gold substrates modified using dodecanethiol SAM. The molecular characteristics and thickness of the monolayers were determined using Fourier Transform infrared (FT-IR) spectroscopy and ellipsometry, respectively. The results showed that SAM inhibits the adsorption of asphaltenes on surface. To investigate the morphology of asphatlene aggregates, we used atomic force microscopy (AFM). In addition to qualitative observations of structural changes, quantitative changes in adhesion and contact potential differences (VCPD) of asphaltene aggregates as a function of temperature were also carried out.
Language
English
DOI
doi:10.7939/R3W39C
Rights
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.
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