Time resolved spectroscopic NMR imaging using hyperpolarized 129Xe

Han, Songi; Kühn, H.; Häsing, F. Wolfgang; Münnemann, Kerstin; Blümich, Bernhard; Appelt, Stephan

doi:10.1016/j.jmr.2004.01.004

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…Therefore, we guess that the translational motion of Xe atoms and ethanol molecules was dominated by convection rather than diffusion. This convection is driven by the gas flow, the temperature gradient, and the difference of mass density between Xe and ethanol [18]. This is similar to gas experiments in that the gaseous atoms collide with the cell walls by both diffusive and convective motions in buffer gases [19].…”

Section: Methodssupporting

confidence: 62%

Surface relaxation of polarized Xe atoms dissolved in deuterated ethanol

Ishikawa

Yamamoto

Takagi

2006

Journal of Magnetic Resonance

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Section: Methodssupporting

confidence: 62%

Surface relaxation of polarized Xe atoms dissolved in deuterated ethanol

Ishikawa

Yamamoto

Takagi

2006

Journal of Magnetic Resonance

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“…The signal enhancement in NMR spectroscopy due to the hyperpolarization of 129 Xe offers the possibility of fast measurements and the online monitoring of dynamic processes. − Furthermore, one can take advantage of two other properties of the 129 Xe nucleus: First, the large polarizability of the xenon electron cloud by its physical and chemical environment leads to a large chemical shift range of 129 Xe NMR. This sensitivity allows for reporting of sample properties by the chemical shift of the Xe atom without the need of covalent bonding between the Xe atom and the sample molecules.…”

Section: Introductionmentioning

confidence: 99%

Online Monitoring of Styrene Polymerization in Miniemulsion by Hyperpolarized¹²⁹Xenon NMR Spectroscopy

et al. 2012

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Online monitoring of a miniemulsion polymerization of styrene by hyperpolarized 129 Xe NMR spectroscopy is presented. The chemical shift of 129 Xe directly reports on the monomer/polymer ratio in the reaction mixture and therefore on the conversion of the reaction. The method allows for monitoring the progress of a polymerization with high time resolution and without sample extraction. The results obtained by 129 Xe NMR spectroscopy were successfully validated by comparison with results of calorimetry. Further characterization of the polymer dispersions with regard to the solids content and the particle diameters proved the comparability of both methods. Small deviations in the kinetic data and the properties of the polymer suspension from both methods are explained by the loss of monomer during the 129 Xe NMR experiments due to the used setup. In the future, 129 Xe NMR might also be applied for online monitoring of other chemicals reactions, e.g., allowing for determining the kinetics of thermoneutral reactions.

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