High-field cross polarization NMR from laser-polarized xenon to a polymer surface

Long, Henry W.; Gaede, Holly C.; Shore, Jay S.; Reven, Linda; Bowers, Clifford R.; Kritzenberger, J.; Pietraß, Tanja; Pines, Alexander; Tang, Pei; Reimer, Jeffrey A.

doi:10.1021/ja00071a086

Cited by 91 publications

(60 citation statements)

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“…Surface adsorption of xenon onto polymers and metal particles was the pioneering application by the Pines group that bought laser-polarized noble gas NMR from the atomic physics laboratory [24]. Their initial work depended on observation of enhanced IH, t3C and 29Si spectra by cross-polarization from the highly polarized 129Xe nucleus [68][69][70][71]. Later, signal enhancement in solution was achieved with the spin-polarized nuclear Overhauser effect transfer [72], a subject that has been explained and reviewed in detail [73].…”

Section: Ther Applicationsmentioning

confidence: 99%

Novel MRI applications of laser-polarized noble gases

Mair

Walsworth

2002

Appl. Magn. Reson.

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Gas-phase nuclear magnetic resonance (NMR) has great potential asa probe fora variety of interesting physical and biomedical problems that are not amenable to study by water or similar liquid. However, NMR of gases was largely neglected due to the low signal obtained from the thermally polarized gases with very low sample density. The advent of optical pumping techniques for enhancing the polarization of the noble gases 3He and 129Xe has bought new life to this field, especially in medical imaging where 3He lung inhalation imaging is approaching a clinical application. However, there are numerous applications in materials science that also benefit from the use of these gases. We review primarily nonmedical applications of laser-polarized noble gases for both NMR imaging and spectroscopy and highlight progress with examples from our laboratory including highresolution imaging at millitesla applied field strength and velocity imaging of convective flow. Porous media microstucture has been probed with both thermal and laser-polarized xenon, as xenon is an ideal probe due to low surface interaction with the grains of the porous media.

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Section: Ther Applicationsmentioning

confidence: 99%

Novel MRI applications of laser-polarized noble gases

Mair

Walsworth

2002

Appl. Magn. Reson.

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“…Therefore, nuclear dipolar spin-exchange plays an important role in spin injection into the salts at 100 C. On the other hand, atom-exchange is expected to dominate at the higher temperature. The large signal of the bulk salt hides the physics about adsorbed ions at the surface [15,16] even by measurements in a wide temperature range. As is the case in spin-exchange via resonant dipolar interaction, atom-exchange is expected to be nearly independent of magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Hyperpolarized cesium ions doped in a glass material

Ishikawa

2014

Journal of Magnetic Resonance

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“…For many systems of interest, such as polymers, there are no such distinctive surface nuclei. We have reported recently [8] a method of detecting surface species in such a system by adsorbing optically polarized xenon-129 onto a polymer surface and using the polarized xenon as the source of magnetization in a CP experiment. Gas phase xenon with nuclear spin polarizations up to 105 times higher than thermal Boltzmann levels in high magnetic field may be obtained using optically pumped rubidium vapor according to the pioneering work of Happer and coworkers and others [9,10].…”

Section: Introduetionmentioning

confidence: 99%

High-field cross polarization NMR from laser-polarized xenon to surface nuclei

et al. 1995

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Abstraet.A method for NMR investigations of surface nuclei using cross polarization from optically polarized xenon (OPCP) is descfibed. We find this methodology results in enhancement faetors of approximately 103 upon application to surface protons. The dynamics of 129Xe transfer to protons is examined in some detail, including the time, temperature, and multiple contact dependences of signal intensities. Furthermore, we diseuss the sensitivity of the transfer process to spatial diffusion. Finally, we report on application of the OPCP experiment to a low total surface area sample. I. IntroduetionSolid-state NMR is a useful technique for investigating the structure and dynamics of bulk materials; however, because of its low sensitivity, its utility for studying surfaces has been limited to high surface area materials such as zeolites [1][2][3].In addition to the problem of sensitivity, selectivity, i.e. the problem of distinguishing surface from bulk species, is also an issue. Cross polarization (CP) [4] has been used successfully to selectively probe surface nuclei when the magnetization source, usually protons, resides exclusively at the surface. Maciel and Sindorf have utilized 1H-29Si CP-MAS to investigate the resonances of surface silicon atoms in silica [5]. Oldfield and coworkers used 1H-170 CP to observe surface hydroxyl groups of high surface area metal oxides that are difficult to detect by conventional NMR [6]. This technique is also useful for investigating interfaces. Zumbulyadis and O'Reilly have used lH-29Si CP to estimate the proximity of the backbone of a polymer to the surface of silica [7].

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High-field cross polarization NMR from laser-polarized xenon to a polymer surface

Cited by 91 publications

References 1 publication

Novel MRI applications of laser-polarized noble gases

Novel MRI applications of laser-polarized noble gases

Hyperpolarized cesium ions doped in a glass material

High-field cross polarization NMR from laser-polarized xenon to surface nuclei

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