Oligomeric alkoxysilanes with cagelike hybrids as cores: Designed precursors of nanohybrid materials

Hideki Kuge, Yoshiaki Hagiwara, Atsushi Shimojima, Kazuyuki Kuroda

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    13 Citations (Scopus)

    Abstract

    Well-defined alkoxysilane oligomers containing a cagelike carbosiloxane core were synthesized and used as novel building blocks for the formation of siloxane-based hybrid networks. These oligomers were synthesized from the cagelike trimer derived from bis(triethoxysilyl)methane by silylation with mono-, di-, and triethoxychlorosilanes ((EtO)nMe3-nSiCl, n=1, 2, and 3). Hybrid xerogels were prepared by hydrolysis and polycondensation of these oligomers under acidic conditions. The structures of the products varied depending on the number of alkoxy groups (n). When n=2 and 3, microporous xerogels (BET surface areas of 820 and 510 m2g-1, respectively) were obtained, whereas a nonporous xerogel was obtained when n=1. 29̂Si NMR spectroscopic analysis suggested that partial rearrangement of the siloxane networks, which accompanied the cleavage of the Si-O-Si linkages, occurred during the polycondensation processes. By using an amphiphilic triblock copolymer surfactant as a structure-directing agent, hybrid thin films with a 2D hexagonal mesostructure were obtained when n=2 and 3. These results provide important insight into the rational synthesis of molecularly designed hybrid materials by sol-gel chemistry.

    Original languageEnglish
    Pages (from-to)600-606
    Number of pages7
    JournalChemistry - An Asian Journal
    Volume3
    Issue number3
    DOIs
    Publication statusPublished - 2008 Mar 7

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    Keywords

    • Mesoporous materials
    • Organic-inorganic hybrid composites
    • Self-assembly
    • Siloxanes
    • Sol-gel processes

    ASJC Scopus subject areas

    • Chemistry(all)

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