Three-dimensional cubic mesoporous structures of SBA-12 and related materials by electron crystallography

Yasuhiro Sakamoto, Isabel Díaz, Osamu Terasaki, Dongyuan Zhao, Joaquin Pérez-Pariente, Ji Man Kim, Galen D. Stucky

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152 Citations (Scopus)


The chemical potential difference between homopolymer fractions in block copolymers can be readily used to selectively design, and cooperatively assemble, inorganic species into highly ordered three-dimensional (3d) periodic composite arrays of separated mesoscale regions. The actual details and symmetry of these regions and their long-range order can only be determined by 3d imaging and analysis with high-resolution electron microscopy (HREM). Of particular interest is the differentiation between configurations with very similar organization energies, such as the cubic and hexagonal (SBA-2) closed-packed structures. Mesoporous silica SBA-12 and functionalized SBA-12 (SH-SBA-12) have been synthesized from the 3-mercaptopropyl group by using nonionic surfactant C18H37(CH2CH2O)10 (C18EO10, Brij 76) under acidic hydrothermal condition. Relatively large single-phase domains were obtained in SH-SBA-12. The 3d structural solution of SH-SBA-12 was obtained by Fourier analyses of HREM images. The structure is composed of spherical cavities, which are arranged in a cubic close-packed structure, in which each cavity is connected to the twelve nearest-neighbor cavities through openings parallel to the <110> directions. HREM images of SBA-12 taken over large sample regions show that SBA-12 is a mixture of mostly the cubic close-packed phase, which consist of beautifully crystalline narrow bands with the same 3d structure in twin relation to each other and a relatively i small amount of the 3d hexagonal close packed phase.

Original languageEnglish
Pages (from-to)3118-3123
Number of pages6
JournalJournal of Physical Chemistry B
Issue number12
Publication statusPublished - 2002 Mar 28

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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