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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

Probing memory effects in confined fluids via diffusion measurements.

Sergei Naumov1, Rustem Valiullin, Peter A Monson

  • 1Abteilung Grenzflächenphysik, Fakultät für Physik and Geowissenschaften, Universität Leipzig, D-04103 Leipzig, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

Fluid behavior in porous materials shows a "memory" effect, where molecule amount depends on past conditions. Nuclear Magnetic Resonance (NMR) reveals differing fluid diffusivities, indicating unique spatial arrangements in non-equilibrium states.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Fluid confinement in porous materials is crucial for technologies like catalysis and separations.
  • These systems exhibit complex many-molecule interactions and a history-dependent "memory" effect.
  • Understanding these phenomena is key to optimizing technological applications.

Purpose of the Study:

  • To investigate the history-dependent states of confined fluids using intrinsic diffusivity measurements.
  • To explore the relationship between fluid density, spatial distribution, and transport properties.
  • To utilize Nuclear Magnetic Resonance (NMR) as a probe for non-equilibrium phenomena.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to measure intrinsic diffusivity.
  • Controlled manipulation of external conditions to induce history-dependent states.
  • Analysis of fluid density and spatial distribution within porous media.

Main Results:

  • Intrinsic diffusivity measured by NMR effectively probes history-dependent fluid states.
  • Significant differences in diffusivity were observed between out-of-equilibrium states with identical densities within the hysteresis loop.
  • These diffusivity variations correlate with distinct spatial distributions of the confined fluid.

Conclusions:

  • NMR-measured diffusivity is a sensitive indicator of arrested equilibration in confined fluids.
  • History-dependent spatial arrangements significantly impact fluid transport properties.
  • This work provides fundamental insights into the complex behavior of fluids in porous materials.