In situ analysis of aqueous structure and adsorption at fluorocarbon, hydrocarbon and mineral surfaces

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dc.contributor.authorHopkins, Adam Justin, 1980-
dc.date.accessioned2011-06-15T17:05:43Z
dc.date.available2011-06-15T17:05:43Z
dc.date.issued2010-09
dc.descriptionxvii, 209 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.en_US
dc.description.abstractAltering and controlling the properties of solid surfaces in aqueous or other liquid phase environments has been a sought after objective for decades. With the discovery of chemisorbed self-assembled monolayers, this dream has become a reality. Oxide and metal surfaces can now be readily coated with an array of commercially available products to produce a desired fnctionality. The presence of these coatings on solid surfaces affects properties of the interfacial region by altering interfacial electrostatic fields, changing the structure of interfacial water molecules and altering the interactions of adsorbed species. This dissertation reports on in situ studies of adsorption at several solid/aqueous interfaces using vibrational sum-frequency spectroscopy, a surface specific technique. These studies are augmented by the use of atomic force microscopy and contact angle goniometry to characterize the prepared surfaces and their interactions with adsorbates. The studies investigate how changes in the surface structure and chemistry, as well as the bulk aqueous phase, affect interfacial structure. The studies within are primarily focused on the interactions of water with bare and functionalized fused silica and the relationship between the aqueous phase composition and the structure of fluorocarbon and hydrocarbon self-assembled monolayers. The variations in aqueous structure are then examined in detail using ionic strength controlled experiments to understand the direct interactions of water hydrophobically coated silica. This analysis is followed by an investigation of the competitive adsorption of methanol and water at fluorocarbon and hydrocarbon monolayers which show spectroscopic signatures of the interaction strength between fluorocarbons and hydrocarbons. Further studies are performed using butylammonium chloride to verify these spectroscopic signatures and reveal different molecular structures of adsorbed species at chemically different hydrophobic surfaces. Lastly, specific ion effects on the CaF 2 /water interface are shown using equilibrium and time-resolved sum-frequency spectroscopy. The results of all these studies have implications for an array of surface chemical applications from mineral flotation to biocompatibility. This dissertation includes previously published co-authored material.en_US
dc.description.sponsorshipCommittee in charge: Thomas Dyke, Chairperson, Chemistry; Geraldine Richmond, Advisor, Chemistry; James Hutchison, Member, Chemistry; Mark Lonergan, Member, Chemistry; Qusheng Jin, Outside Member, Geological Sciencesen_US
dc.identifier.urihttps://hdl.handle.net/1794/11267
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.relation.ispartofseriesUniversity of Oregon theses, Dept. of Chemistry, Ph. D., 2010;
dc.subjectAqueous structureen_US
dc.subjectFluorocarbonen_US
dc.subjectHydrocarbonen_US
dc.subjectMineral surfacesen_US
dc.subjectSelf assembled monolayeren_US
dc.subjectWateren_US
dc.subjectMethanolen_US
dc.subjectIon adsorptionen_US
dc.subjectChemistryen_US
dc.subjectPhysical chemistryen_US
dc.subjectMaterials scienceen_US
dc.titleIn situ analysis of aqueous structure and adsorption at fluorocarbon, hydrocarbon and mineral surfacesen_US
dc.typeThesisen_US

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