Show simple item record

dc.contributor.advisorPaige, Matthew F.en_US
dc.contributor.advisorUrquhart, Stephen G.en_US
dc.creatorChristensen, Stephen Lynden_US
dc.date.accessioned2009-12-22T15:06:46Zen_US
dc.date.accessioned2013-01-04T05:12:43Z
dc.date.available2011-01-06T08:00:00Zen_US
dc.date.available2013-01-04T05:12:43Z
dc.date.created2009-12en_US
dc.date.issued2009-12en_US
dc.date.submittedDecember 2009en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-12222009-150646en_US
dc.description.abstractLangmuir-Blodgett (LB) organic monomolecular (monolayer) films containing fatty acids and their perfluorinated counterparts separate into phases under certain conditions. These perfluorinated surfactant containing mixed-phase systems have been shown to exhibit many favourable attributes in comparison to non- perfluorinated surfactant monolayers. In this thesis project, two of these films were investigated. One film is a 2:1 ratio mixture of arachidic acid (C19H39COOH – AA) to perfluorotetradecanoic acid (C13F27COOH – PA), which phase-separates into hexagonal domains ~6 ìm large (2:1 ratio of AA to PA – 2AA1PA). The other film is a 2:1 mixture of stearic acid (C17H35COOH - SA) to PA, which phase-separates into linear domains ~300 nm wide (2:1 ratio of SA to PA – 2SA1PA). Through the use of atomic force microscopy (AFM), and various synchrotron photoemission electron microscopy-based (PEEM) techniques, the films were characterized. As properties such as molecular organization, and dispersion of the molecules in the film, affect film function, it is necessary to use a variety of techniques to better understand order and composition in the films. First, the well-known and previously-studied film, 2AA1PA, was used to better understand contrast mechanisms in the energy filtered x-ray photoemission electron microscope (X-PEEM) at the CLS. Through the use of techniques such as secondary electron emission microscopy (SEEM), ultraviolet photoelectron spectroscopy (UPS), and x-ray linear dichroism microscopy (XLDM), the effects of secondary electrons, valence character, and polarization dependence were studied so as to better understand their contribution to contrast in energy-filtered PEEM-based spectromicroscopy. Second, the composition and organization of a novel system (2SA1PA), was characterized using traditional near-edge x-ray absorption fine-structure (NEXAFS) spectroscopy. As the size of the domains in the 2SA1PA system are below the spatial resolution limit of PEEM spectromicroscopy, methods involving selective phase dissolution, and spectrum subtraction, were used to acquire phase composition and molecular order information. The high lateral and vertical spatial resolution of AFM allowed physical imaging and confirmation of sample structure, as well as very accurate domain height determination. X-PEEM supplements this with chemical sensitivity using high spatial resolution spectromicroscopy. Therefore, using AFM and X-PEEM as complimentary techniques, it is possible to physically and chemically characterize phase-separated monolayer films.en_US
dc.language.isoen_USen_US
dc.subjectsurfactantsen_US
dc.subjectmonolayersen_US
dc.subjectLangmuir-Blodgetten_US
dc.subjectPEEMen_US
dc.subjectsynchrotronen_US
dc.subjectNEXAFSen_US
dc.subjectspectromicroscopyen_US
dc.titlePhotoemission electron microscopy and atomic force microscopy of phase- separated Langmuir-Blodgett monolayer thin filmsen_US
thesis.degree.departmentChemistryen_US
thesis.degree.disciplineChemistryen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberBurgess, Ianen_US
dc.contributor.committeeMemberPratt, Brianen_US
dc.contributor.committeeMemberWard, Dale E.en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record