A nuclear magnetic resonance spectroscopic investigation of the molecular structure and aggregation behavior of asphaltenes

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dc.contributor.authorDutta Majumdar, Rudraksha
dc.contributor.authorUniversity of Lethbridge. Faculty of Arts and Science
dc.contributor.supervisorHazendonk, Paul
dc.contributor.supervisorGerken, Michael
dc.date.accessioned2016-06-17T17:32:04Z
dc.date.available2016-06-17T17:32:04Z
dc.date.issued2015
dc.degree.levelPh.Den_US
dc.description.abstractThe molecular and aggregate structure of asphaltenes derived from oil-sands bitumen, heavy black-oil and coal, and their aggregation behavior, have been studied comprehensively using solution- and solid-state nuclear magnetic resonance (NMR) spectroscopic techniques. It is shown using solution-state relaxation and 2D correlation methods, and cross-polarization-based solid-state techniques that the “island” model is the predominant architecture for asphaltenes derived from Athabasca oil-sands bitumen. Asphaltenes derived from different petroleum and coal sources are compared, and it is shown that alkyl sidechains play a significant role in asphaltene aggregation. The average asphaltene molecule is shown to be larger than previously posited, likely possessing pendant aromatic rings. The very first experimental evidence for alkyl groups intercalated between asphaltene aromatic sheets is presented. Finally, ultrafast magic angle spinning solid-state NMR experiments were used to achieve unprecedented resolution in the solid-state 1H NMR spectrum, allowing for the observation and relaxation measurements of otherwise obscure signals.en_US
dc.embargoYesen_US
dc.embargo.end2016-06-14
dc.embargo.start2015-12-15
dc.identifier.urihttps://hdl.handle.net/10133/4526
dc.language.isoen_CAen_US
dc.proquest.subject0486en_US
dc.proquest.subject0494en_US
dc.proquest.subject0765en_US
dc.proquestyesYesen_US
dc.publisherLethbridge, Alta : University of Lethbridge, Dept. of Chemistry and Biochemistryen_US
dc.publisher.departmentDepartment of Chemistry and Biochemistryen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectSpectroscopyen_US
dc.subjectNuclear magnetic resonance spectroscopyen_US
dc.subjectPetroleumen_US
dc.subjectSolid-state NMRen_US
dc.subjectAsphaltenesen_US
dc.titleA nuclear magnetic resonance spectroscopic investigation of the molecular structure and aggregation behavior of asphaltenesen_US
dc.typeThesisen_US
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