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Time resolved spectroscopic NMR imaging using hyperpolarized 129Xe.

S Han1, H Kühn, F W Häsing

  • 1Max-Planck Institute for Polymer Research, Ackermannweg 10, D-55128, Mainz, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 26, 2004
PubMed
Summary
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Hyperpolarized xenon (Xe) ice melting and dissolution were visualized using nuclear magnetic resonance (NMR). Xenon can be stored and delivered at high concentrations in pure ethanol, even at room temperature.

Area of Science:

  • Physical Chemistry
  • Materials Science

Background:

  • Understanding phase transitions of xenon ice is crucial for applications involving hyperpolarized gases.
  • Nuclear Magnetic Resonance (NMR) offers unique insights into molecular dynamics and phase behavior.

Purpose of the Study:

  • To visualize and characterize the melting and dissolution of xenon ice in different solvents.
  • To investigate the storage and delivery capabilities of hyperpolarized xenon in ethanol.

Main Methods:

  • Utilized hyperpolarized 129Xe nuclear magnetic resonance (NMR) spectroscopy and imaging.
  • Employed time-resolved spectroscopic imaging to monitor Xe phase transitions.
  • Studied xenon ice melting on ethanol and ethanol/water ice blocks as a function of temperature and time.

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Main Results:

  • Observed distinct melting and dissolution pathways for xenon ice in pure ethanol versus an ethanol/water mixture.
  • In pure ethanol, xenon ice dissolved, forming a liquid Xe/ethanol layer where xenon remained trapped and polarized for up to 11 minutes.
  • In ethanol/water mixtures, polarized xenon predominantly remained in the gas phase or became trapped within the ice pores.

Conclusions:

  • Pure ethanol can store and deliver hyperpolarized xenon at high concentrations, even at room temperature.
  • The solvent composition significantly influences the phase behavior and localization of hyperpolarized xenon.
  • NMR techniques provide powerful tools for studying dynamic processes of hyperpolarized gases.