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Probing short length scales with restricted diffusion in a static gradient using the CPMG sequence.

Lukasz J Zielinski1, Martin D Hürlimann

  • 1Schlumberger-Doll Research, 36 Old Quarry Road, Ridgefield, CT 06877-4108, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 14, 2004
PubMed
Summary

This study introduces a novel diffusion Nuclear Magnetic Resonance (NMR) method using the direct Carr-Purcell-Meiboom-Gill (CPMG) pathway. This technique enhances the surface-to-volume ratio (S/V) measurement of porous materials by probing smaller structures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • Porous media characterization is crucial in various scientific fields.
  • Nuclear Magnetic Resonance (NMR) diffusion techniques are widely used for probing microstructures.
  • Conventional methods like pulsed field gradient (PFG) NMR have limitations in resolving small length scales.

Purpose of the Study:

  • To experimentally verify a new diffusion NMR method for extracting the surface-to-volume ratio (S/V) of porous media.
  • To demonstrate the capability of the direct Carr-Purcell-Meiboom-Gill (CPMG) pathway for probing smaller length scales compared to conventional techniques.
  • To investigate the sensitivity of the direct CPMG pathway in a low-field static-gradient system.

Main Methods:

Related Experiment Videos

  • Utilizing diffusion Nuclear Magnetic Resonance (NMR).
  • Employing the direct Carr-Purcell-Meiboom-Gill (CPMG) coherence pathway.
  • Conducting experiments in a low-field static-gradient system.
  • Comparing results with the conventional stimulated echo coherence pathway (PFG).

    • Main Results:

    • The direct CPMG pathway allows for the extraction of surface-to-volume ratio (S/V) in porous media.
    • This new method is sensitive to structure an order of magnitude smaller than accessible with the stimulated-echo pathway.
    • The relevant ruler length for the direct pathway is determined by diffusion length during a single inter-pulse spacing, enabling probing of shorter length scales.

    Conclusions:

    • The direct CPMG pathway in diffusion NMR offers a significant advancement for characterizing porous media at smaller length scales.
    • This method provides a more sensitive approach to determining the surface-to-volume ratio (S/V) compared to traditional PFG techniques.
    • The findings open new avenues for detailed microstructural analysis of various materials using NMR.