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Xenon porometry at room temperature.

Ville-Veikko Telkki1, Juhani Lounila, Jukka Jokisaari

  • 1NMR Research Group, Department of Physical Sciences, University of Oulu, P.O. Box 3000, FIN-90014, Finland.

The Journal of Chemical Physics
|January 28, 2006
PubMed
Summary

Xenon porometry using naphthalene as a medium allows precise pore size distribution determination. This method utilizes 129Xe NMR signal shifts, offering a simple yet effective way to analyze porous materials.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Analytical Chemistry

Background:

  • Xenon porometry is an advanced technique utilizing 129Xe nuclear magnetic resonance (NMR) to probe porous materials.
  • The chemical shift of specific 129Xe NMR signals, particularly signal D, is sensitive to pore size, especially within confined media.

Purpose of the Study:

  • To establish a method for determining pore size distribution in porous materials using naphthalene as the medium in 129Xe NMR porometry.
  • To develop a model explaining the relationship between chemical shift and pore radius.

Main Methods:

  • Utilizing 129Xe NMR spectroscopy with xenon gas dissolved in naphthalene as the confined medium.
  • Measuring one-dimensional NMR spectra near room temperature.
  • Correlating the chemical shift of signal D to pore radius.
  • Analyzing other spectral signals and the influence of xenon pressure.

Main Results:

  • Demonstrated that pore size distribution can be determined from a single 129Xe NMR spectrum near room temperature when using naphthalene.
  • Developed and validated a model explaining the chemical shift behavior of signal D as a function of pore radius.
  • Identified other spectral signals and studied the effect of xenon pressure.

Conclusions:

  • Naphthalene-based 129Xe NMR porometry provides an efficient method for pore size distribution analysis.
  • The developed model enhances the understanding of xenon-gas-solid interactions in confined spaces.
  • This technique offers a valuable tool for characterizing porous materials.

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