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Related Experiment Video

Updated: Aug 1, 2025

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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Diffusion within pores fully revealed by magnetic resonance.

Evren Özarslan1, Cem Yolcu1, Alfredo Ordinola1

  • 1Department of Biomedical Engineering, Linköping University, Linköping, Sweden.

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Summary

This study introduces a novel magnetic resonance method to fully characterize diffusion propagators. This technique maps pore structure and diffusive dynamics, overcoming previous limitations in observing these properties.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Diffusion processes are sensitive to pore structure and boundaries.
  • Magnetic resonance (MR) has been used to study diffusion, but full characterization remains challenging.

Purpose of the Study:

  • To develop and apply a novel MR technique for comprehensive diffusion propagator measurement.
  • To enable detailed mapping of pore structure and diffusive dynamics.

Main Methods:

  • Utilized a specialized sequence of magnetic field gradient pulses.
  • Measured the diffusion propagator to analyze diffusion within confined environments.

Main Results:

  • Successfully mapped structural dispersity within pores.
  • Determined both the shape of pores and the diffusive dynamics inside them.
  • Enabled "listening to the drum" to understand diffusion characteristics.

Conclusions:

  • The developed MR method provides a complete characterization of the diffusion propagator.
  • This technique offers unprecedented insight into pore structure and internal diffusive behavior.