Transformation of layered docosyltrimethyl- and docosyltriethylammonium silicates derived from kanemite into precursors for ordered mesoporous silicas

Tatsuo Kimura, Daigo Itoh, Tetsuro Shigeno, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    The transformation of layered silicate-surfactant materials derived from a layered polysilicate kanemite into precursors for ordered mesoporous silicas was investigated. When kanemite was allowed to react with docosyltrimethylammonium (C22TMA) and docosyltriethylammonium (C22TEA) surfactants, layered C22-TMA- and C22TEA-silicate materials were formed. The 29Si MAS NMR spectra of the layered intermediates clearly indicated that fragmented silicate sheets were present in the silicate-surfactant materials. These layered materials can be transformed by acid treatment into mesostructured precursors with three-dimensional (3-d) silicate networks that afford uniform mesopores after the removal of the surfactants. Ordered mesoporous silica with a 2-d hexagonal structure (FSM-16) can be obtained by using C22TEA with a larger headgroup. The results here successfully support the proposed formation mechanism of FSM-16, which consists of assembling of fragmented layered silicate sheets with surfactants and the subsequent structural transformation to the 2-d hexagonal mesophase.

    Original languageEnglish
    Pages (from-to)9574-9577
    Number of pages4
    JournalLangmuir
    Volume18
    Issue number24
    DOIs
    Publication statusPublished - 2002 Nov 26

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    Silicates
    Silicon Dioxide
    silicates
    Surface-Active Agents
    Silica
    silicon dioxide
    Surface active agents
    surfactants
    assembling
    Nuclear magnetic resonance
    nuclear magnetic resonance
    acids
    Acids

    ASJC Scopus subject areas

    • Colloid and Surface Chemistry
    • Physical and Theoretical Chemistry

    Cite this

    Transformation of layered docosyltrimethyl- and docosyltriethylammonium silicates derived from kanemite into precursors for ordered mesoporous silicas. / Kimura, Tatsuo; Itoh, Daigo; Shigeno, Tetsuro; Kuroda, Kazuyuki.

    In: Langmuir, Vol. 18, No. 24, 26.11.2002, p. 9574-9577.

    Research output: Contribution to journalArticle

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    AU - Shigeno, Tetsuro

    AU - Kuroda, Kazuyuki

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