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Two-dimensional diffusion time correlation experiment using a single direction gradient.

Jeffrey L Paulsen1, Yi-Qiao Song1

  • 1Schlumberger-Doll Research Cambridge, MA 02139, United States.

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|May 14, 2014
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Summary
This summary is machine-generated.

This study introduces a two-dimensional Diffusion Time Correlation (DTC) experiment using pulsed field gradient (PFG) NMR. The method effectively separates restricted diffusion from bulk diffusion in complex porous media.

Keywords:
Diffusion–diffusion correlationPorous mediaRestricted diffusiond-PFG

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science
  • Physical Chemistry

Background:

  • Pulsed Field Gradient (PFG) NMR is standard for studying diffusion in porous materials.
  • Analyzing diffusion in real-world materials is challenging due to pore size variations and multiple fluid phases.
  • Existing methods struggle to differentiate between various diffusion behaviors within complex systems.

Purpose of the Study:

  • To develop a novel two-dimensional Diffusion Time Correlation (DTC) experiment.
  • To enhance the analysis of diffusion coefficients in porous media.
  • To differentiate restricted diffusion from bulk diffusion processes.

Main Methods:

  • Utilized a double-PFG sequence with a single-direction gradient.
  • Developed a two-dimensional correlation function correlating diffusion coefficients at different diffusion times.
  • Applied the method to plant and bulk water samples.

Main Results:

  • Successfully generated a two-dimensional correlation map of diffusion coefficients.
  • Demonstrated the ability to separate restricted diffusion from bulk diffusion.
  • Showcased the utility of the d-PFG technique in correlating apparent diffusion coefficients.

Conclusions:

  • The DTC experiment provides a powerful tool for characterizing diffusion in complex porous media.
  • The developed method offers improved resolution for diffusion analysis compared to conventional PFG NMR.
  • This technique advances the understanding of fluid transport in heterogeneous materials.