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Binary fluids in mesoporous materials: Phase separation studied by NMR relaxation and diffusion.

Siegfried Stapf1, Niklas Siebert1, Timo Spalek1

  • 1Technische Physik II/Polymerphysik, Technische Universität Ilmenau, D-98684, Ilmenau, Germany.

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|September 8, 2025
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Summary

This study investigates liquid-surface interactions in porous glass using relaxation and diffusion measurements. Findings reveal preferential adsorption and phase separation in binary liquid systems within nanopores.

Keywords:
Binary fluidsFast field cyclingNMR relaxationPhase separationPorous media

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Surface Science

Background:

  • Porous glass (Vycor) with controlled pore sizes (approx. 4 nm) was used to study liquid behavior.
  • Understanding liquid-surface interactions is crucial for various applications, including catalysis and separations.

Purpose of the Study:

  • To investigate liquid-surface interactions in nanoporous materials using relaxation and diffusion measurements.
  • To analyze the influence of pore confinement on molecular dynamics and interactions.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) relaxation measurements (T1 and T2) were performed on single and binary liquid systems.
  • Diffusion measurements were used to determine apparent tortuosity and assess phase separation.

Main Results:

  • Longitudinal relaxation time (T1) dispersion was observed for both polar and non-polar liquids, indicating liquid-surface interactions.
  • Transverse relaxation time (T2) changes probed the strength of molecular interactions.
  • Differences in relaxation dispersion between single and binary systems provided evidence for preferential adsorption and phase separation.
  • Intermolecular relaxation mechanisms were suggested for 1H nuclei.

Conclusions:

  • Liquid-surface interactions in nanoporous glass are significant, affecting molecular dynamics.
  • Preferential adsorption and phase separation occur in binary liquid mixtures within the pores.
  • NMR relaxation and diffusion measurements are effective tools for characterizing complex fluid behavior in porous media.