Alkoxysilylated-derivatives of double-four-ring silicate as novel building blocks of silica-based materials

    Research output: Contribution to journalArticle

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    Abstract

    Novel oligomeric alkoxysilanes consisting of double-four-ring (D4R) units functionalized with mono-, di-, and trialkoxysilyl groups (designated as 1, 2, and 3, respectively) were designed as nanobuilding blocks for synthesizing silica-based nanomaterials. Hydrolysis and polycondensation of these oligomers were performed under acidic conditions. The gelation occurred much faster than monomeric, dimeric, and cubic octameric alkoxysilanes, which should depend on both molecular size and siloxane structures. Structural analyses of the xerogels derived from 1-3 strongly suggested that the D4R units are at least partly retained in their frameworks. The number of alkoxy groups had a large effect on their porosities: the xerogel derived from 2 was a microporous solid with the BET surface area of 600 m2 g-1, whereas 1- and 3-derived xerogels had very low BET surface areas. Furthermore, mesostructured silica films were successfully synthesized from 2 and 3 by using amphiphilic triblock copolymer surfactant as a structure-directing agent. Such an approach will lead to the construction of molecularly designed siloxane networks.

    Original languageEnglish
    Pages (from-to)1147-1153
    Number of pages7
    JournalChemistry of Materials
    Volume20
    Issue number3
    DOIs
    Publication statusPublished - 2008 Feb 12

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    Silicates
    Xerogels
    Silicon Dioxide
    Siloxanes
    Silica
    Derivatives
    Gelation
    Polycondensation
    Oligomers
    Nanostructured materials
    Surface-Active Agents
    Block copolymers
    Hydrolysis
    Surface active agents
    Porosity

    ASJC Scopus subject areas

    • Materials Chemistry
    • Materials Science(all)

    Cite this

    Alkoxysilylated-derivatives of double-four-ring silicate as novel building blocks of silica-based materials. / Hagiwara, Yoshiaki; Shimojima, Atsushi; Kuroda, Kazuyuki.

    In: Chemistry of Materials, Vol. 20, No. 3, 12.02.2008, p. 1147-1153.

    Research output: Contribution to journalArticle

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