Imaging the pore structure and polytypic intergrowths in mesoporous silica

Wuzong Zhou, HMA Hunter, Paul Anthony Wright, Q Ge, JM Thomas

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Mesoporous silica, SBA-2, has been investigated by using high-resolution transmission electron microscopy supported by computer image simulations. The complete pore structure connecting the discrete supercages of which the silica is composed has been determined. In addition, unexpected well-defined cubic-hexagonal (polytypic) intergrowths have been uncovered, involving a hitherto unknown mesoporous structure that we designate STAC-1, It was found that both SBA-2 and STAC-1 contain a two-dimensional pore system and that the symmetry of the SBA-2 structure must be lower than that (space group P6(3)/mmc) determined previously on the basis of X-ray powder diffraction methods. Polytypic irregularities in these mesoporous materials indicate that, similar to microporous zeolitic systems, a range of solids with structures intermediate between end members SBA-2 and STAC-1 might be prepared.

Original languageEnglish
Pages (from-to)6933-6936
Number of pages4
JournalJournal of Physical Chemistry B
Volume102
Publication statusPublished - 3 Sept 1998

Keywords

  • MOLECULAR-SIEVES
  • CRYSTALLINE
  • COMPLEXES

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