NMR investigations of surfaces and interfaces using spin-polarized xenon

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{sup 129}Xe NMR is potentially useful for the investigation of material surfaces, but has been limited to high surface area samples in which sufficient xenon can be loaded to achieve acceptable signal to noise ratios. In Chapter 2 conventional {sup 129}Xe NMR is used to study a high surface area polymer, a catalyst, and a confined liquid crystal to determine the topology of these systems. Further information about the spatial proximity of different sites of the catalyst and liquid crystal systems is determined through two dimensional exchange NMR in Chapter 3. Lower surface area systems may be investigated with spin-polarized ... continued below

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205 p.

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Gaede, H.C. July 1, 1995.

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  • Gaede, H.C. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry

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{sup 129}Xe NMR is potentially useful for the investigation of material surfaces, but has been limited to high surface area samples in which sufficient xenon can be loaded to achieve acceptable signal to noise ratios. In Chapter 2 conventional {sup 129}Xe NMR is used to study a high surface area polymer, a catalyst, and a confined liquid crystal to determine the topology of these systems. Further information about the spatial proximity of different sites of the catalyst and liquid crystal systems is determined through two dimensional exchange NMR in Chapter 3. Lower surface area systems may be investigated with spin-polarized xenon, which may be achieved through optical pumping and spin exchange. Optically polarized xenon can be up to 10{sup 5} times more sensitive than thermally polarized xenon. In Chapter 4 highly polarized xenon is used to examine the surface of poly(acrylonitrile) and the formation of xenon clathrate hydrates. An attractive use of polarized xenon is as a magnetization source in cross polarization experiments. Cross polarization from adsorbed polarized xenon may allow detection of surface nuclei with drastic enhancements. A non-selective low field thermal mixing technique is used to enhance the {sup 13}C signal of CO{sub 2} of xenon occluded in solid CO{sub 2} by a factor of 200. High-field cross polarization from xenon to proton on the surface of high surface area polymers has enabled signal enhancements of {approximately}1,000. These studies, together with investigations of the efficiency of the cross polarization process from polarized xenon, are discussed in Chapter 5. Another use of polarized xenon is as an imaging contrast agent in systems that are not compatible with traditional contrast agents. The resolution attainable with this method is determined through images of structured phantoms in Chapter 6.

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205 p.

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INIS; OSTI as DE96002062

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  • Other Information: TH: Thesis (Ph.D.)

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  • Other: DE96002062
  • Report No.: LBL--37825
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 125103
  • Archival Resource Key: ark:/67531/metadc619492

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Office of Scientific & Technical Information Technical Reports

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 10:23 a.m.

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Gaede, H.C. NMR investigations of surfaces and interfaces using spin-polarized xenon, thesis or dissertation, July 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc619492/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.