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Controlling the window size in mesoporous SBA-16.

L Qin1, Y Sakamoto, M W Anderson

  • 1Centre for Nanoporous Materials, School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK. m.anderson@manchester.ac.uk.

Physical Chemistry Chemical Physics : PCCP
|June 25, 2014
PubMed
Summary

The structure of mesoporous silica SBA-16 changes significantly with post-synthesis treatment. Calcination expands narrow windows, altering material functionality and framework relaxation.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Mesoporous silica materials like SBA-16 are crucial in catalysis and separations.
  • Understanding the precise pore structure and its evolution is key to optimizing material performance.
  • Post-synthesis treatments can significantly influence the final properties of mesoporous materials.

Purpose of the Study:

  • To investigate the structural changes in SBA-16 after organic template removal.
  • To determine the effect of different post-synthesis treatments (ozone vs. calcination) on SBA-16 structure.
  • To compare the SBA-16 structure with theoretical models like surfaces of constant mean curvature.

Main Methods:

  • Ozone treatment to remove the organic templating agent from as-synthesized SBA-16.

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  • Calcination treatment as an alternative post-synthesis method.
  • Structural analysis through comparison with surfaces of constant mean curvature.

    • Main Results:

    • As-synthesized SBA-16 possesses large cages connected by narrow windows (approx. 7 Å).
    • Calcination treatment significantly widens these windows to about 20 Å.
    • The structure deviates from constant mean curvature surfaces, particularly near the windows, indicating the role of attractive forces during synthesis.

    Conclusions:

    • Post-synthesis treatment critically impacts SBA-16's pore structure and functionality.
    • Calcination leads to framework relaxation towards a constant surface energy.
    • The synthesis mechanism involves attractive forces that shape the window regions.