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Gas Flow & Diffusion In Porous Media Visualization.pdf

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Preview of Gas Flow & Diffusion in Porous Media Visualization
🔗 Source: pines.berkeley.edu
📊 Size: 389 KB
📄 Pages: 5 pages
⬇️ Downloads: 39

Summary

Key points include:

- Technique: The technique uses optical pumping to enhance the spin polarization of noble gases, improving signal sensitivity by 10,000 to 100,000 times, enabling visualization of gas flow and diffusion in porous samples.
- Applications: This method can be used to study complex flow and diffusion in systems with macroscopic dimensions and microscopic internal pore structure, benefiting fields like catalysis, adsorption, and porous media research.
- Materials: The technique is illustrated using silica aerogels and zeolite molecular sieve particles, with xenon gas as the tracer due to its wide chemical shift range.
- Results: NMR spectra and images show xenon gas diffusion into aerogel fragments, with penetration depth depending on gas pressure and time delay between excitation pulses. The diffusion coefficient of xenon inside aerogels is estimated from these images.
- Comparison: This method offers high-resolution, non-invasive visualization of gas flow and diffusion in opaque porous samples, overcoming limitations of other techniques like particle image velocimetry and laser Doppler anemometry.

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Description

The transport of gases in porous materials is crucial in various scientific and technological processes. Magnetic resonance microscopy with laser-polarized noble gases enables visualization of gas dynamics in silica aerogels and zeolite particles with high sensitivity and resolution. Gas transport in aerogel fragments is correlated with xenon diffusion coefficients.

Technical Information

  • File Format: PDF
  • File Size: 389 KB
  • Pages: 5
  • Language: EN
  • Total Downloads: 39
  • Last Updated: 24 hours ago

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