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Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
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How Reproducible are Surface Areas Calculated from the BET Equation?

Johannes W M Osterrieth1, James Rampersad1, David Madden1

  • 1The Adsorption & Advanced Materials Laboratory (A 2ML), Department of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK.

Advanced Materials (Deerfield Beach, Fla.)
|May 23, 2022
PubMed
Summary
This summary is machine-generated.

Reproducibility issues plague the Brunauer-Emmett-Teller (BET) surface area analysis method. A new software, BET surface identification (BETSI), offers accurate and systematic BET area determination for nanoporous materials.

Keywords:
BET theoryadsorptionporosimetryporous materialssurface area

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • The Brunauer-Emmett-Teller (BET) theory is a cornerstone for surface area analysis in materials science.
  • Widely applied to micro- and mesoporous materials, the BET method faces challenges in reproducibility.
  • Inconsistent BET area calculations lead to significant reliability issues in academic and industrial research.

Purpose of the Study:

  • To investigate the reproducibility of BET surface area determination from identical adsorption isotherms.
  • To highlight the critical concerns arising from the variability in reported BET areas.
  • To introduce a novel computational approach for accurate and systematic BET area assignment.

Main Methods:

  • A round-robin study involving sixty-one laboratories analyzing 18 identical adsorption isotherms.
  • Development of a new computational software tool named "BET surface identification" (BETSI).
  • Expansion upon the established Rouquerol criteria for BET analysis within the BETSI software.

Main Results:

  • The round-robin exercise demonstrated a wide spread in BET area values calculated from the same isotherms.
  • This confirms significant reproducibility problems in standard BET analysis.
  • The developed BETSI software provides a systematic and unambiguous method for BET area determination.

Conclusions:

  • The reliability of reported BET surface areas is questionable due to inherent reproducibility issues.
  • The BETSI software offers a robust solution to enhance the accuracy and consistency of BET analysis.
  • Accurate surface area determination is crucial for advancing materials science and nanotechnology.