Structural analyses of intergrowth and stacking fault in cage-type mesoporous crystals

Yasuhiro Sakamoto, Lu Han, Shunai Che, Osamu Terasaki

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22 Citations (Scopus)

Abstract

A mixture of Gemini Cationic surfactant, costructure directing agent (CSDA) with carboxylate group, and silica oligomerleads to the formation of cage-type mesoporous crystals, and the system changes the structure from Fm3m (or P6 3/mmc ) type to Fd3m type with an increasing amount of additive (HC1). Here we have investigated the Fm3m-Fd3m type intergrowth and new type stacking fault observed in the intermediate phase using transmission electron microscopy (TEM) and proposed a layer-by-layer growth mechanism. In order to describe the structures, four types of polyhedra for the tetrahedrally close-packed structures are introduced. In the intergrowth, the structure changes the packing of spherical micelles between the Fraim (or P6 3/mmc ) and Fd3m structures depending on the pH. The results can be explained by the change between a hard sphere characteristic ( perfect sphere) in the Fm3m structure and a soft sphere characteristic (polyhedron) in the Fd3m structure. The stacking fault in the Fd3m structure can be explained by new arrangement of two polyhedra, the 14- and 15-hedron.

Original languageEnglish
Pages (from-to)223-229
Number of pages7
JournalChemistry of Materials
Volume21
Issue number2
DOIs
Publication statusPublished - 2009 Jan 27

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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