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Related Experiment Video

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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

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Published on: September 2, 2016

Pore characterization through propagator-resolved transverse relaxation exchange.

K E Washburn¹, C H Arns, P T Callaghan

¹School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|July 23, 2008

Summary

This study characterizes quartz sand pore spaces using a novel NMR technique. The method reveals molecular movement to estimate pore size, spacing, and tortuosity for fluid behavior analysis.

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Area of Science:

Geophysics
Materials Science
Nuclear Magnetic Resonance Spectroscopy

Background:

Understanding pore space characteristics is crucial for predicting fluid flow in porous media.
Tight-packed quartz sand is a common geological material with complex pore structures.

Purpose of the Study:

To characterize the pore space and fluid behavior in water-saturated, tight-packed quartz sand.
To develop and validate a novel NMR technique for pore structure analysis.

Main Methods:

Propagator-resolved transverse relaxation exchange NMR experiment.
Analysis of T2 exchange plots and peak intensity as a function of displacement and mixing time.
Probabilistic pore-hopping simulation and spreading Gaussian model for system interpretation.

Main Results:

The NMR experiment successfully mapped molecular diffusion within the pore space.
Estimated key pore features including characteristic time, pore radii, and interpore spacing.
Calculated the tortuosity of different pore sizes within the quartz sand.

Conclusions:

The propagator-resolved transverse relaxation exchange experiment is effective for detailed pore space characterization.
This technique provides valuable insights into fluid behavior and transport properties in porous materials.
The findings enable accurate estimation of pore geometry and connectivity.