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Related Experiment Videos

Diffusion NMR methods applied to xenon gas for materials study.

R W Mair1, M S Rosen, R Wang

  • 1Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA. rmair@cfa.harvard.edu

Magnetic Resonance in Chemistry : MRC
|June 17, 2003
PubMed
Summary

Nuclear Magnetic Resonance (NMR) studies reveal xenon gas diffusion in heterogeneous porous media and continuous flow. Pulsed gradient spin-echo techniques provide insights into gas diffusion dynamics and flow imaging.

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Area of Science:

  • Physics
  • Materials Science
  • Chemical Engineering

Background:

  • Nuclear Magnetic Resonance (NMR) is a powerful technique for probing molecular dynamics.
  • Pulsed gradient spin-echo (PGSE) NMR allows for the measurement of diffusion coefficients.
  • Understanding gas diffusion in porous media is crucial for various applications, including catalysis and energy storage.

Purpose of the Study:

  • To investigate xenon gas diffusion in model heterogeneous porous media using PGSE NMR.
  • To explore continuous flow laser-polarized xenon gas dynamics and imaging.
  • To obtain sophisticated information beyond simple translational self-diffusion coefficients.

Main Methods:

  • Utilized PGSE NMR techniques in the gas phase.
  • Employed model heterogeneous porous media consisting of random packs of mixed glass beads of two different sizes.
Keywords:
NASA Discipline Life Sciences TechnologiesNon-NASA Center

Related Experiment Videos

  • Applied Pade approximation for interpolating time-dependent diffusion coefficient data.
  • Investigated continuous flow laser-polarized xenon gas.

    • Main Results:

    • Time-dependent diffusion coefficient D(t) at short times reflected the pore surface area to volume ratio of smaller beads in mixed packs.
    • Approach of D(t) to the long-time limit followed larger beads, with lower limiting D(t) in mixed packs due to lower porosity.
    • Demonstrated velocity-sensitive imaging of high gas flows (20-200 mm s-1) in continuous flow studies.
    • Presented first gas-phase NMR scattering data, showing flow-enhanced structural features.

    Conclusions:

    • PGSE NMR provides valuable insights into structural information of heterogeneous porous systems.
    • Continuous flow NMR imaging enables the study of gas dynamics at high velocities.
    • Gas-phase NMR scattering offers a novel approach to probe flow-induced structural changes.