Effect of organic additives on the formation of alkylsiloxane mesophases

Atsushi Shimojima, Mikako Sakurai, Kazuyuki Kuroda, Tatsuya Okubo

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The effects of organic additives (1,3,5-trialkylbenzenes, n-alkanes, and n-alkyl alcohols) on the formation of hybrid siloxane-organic mesophases from alkoxylated precursors (CnH2n+1Si(OSi(OMe)3)3, 1Cn, n=6, 10, and 16) have been investigated. These precursors become amphiphilic upon hydrolysis of the alkoxy groups, thus forming two-dimensional (2D) hexagonal phase (n=6 and 10) and lamellar phase (n=16) by evaporation-induced self-assembly followed by polycondensation. The addition of 1,3,5-trialkylbenzenes or n-alkanes to the 1C10 system leads to swollen 2D hexagonal phases, thereby achieving pore-size expansion of the calcined samples from 2.0nm up to 3.8nm in diameter. The effect of these organic additives depends largely on the alkyl chain length of 1Cn; the 2D hexagonal structure (n=6) undergoes structural disordering, while the lamellar structure (n=16) remains unchanged. On the other hand, the addition of alkyl alcohols to the 1C10 system causes a drastic change in the mesostructure from 2D hexagonal to lamellar, which can be attributed to possible interactions between alcohol molecules and silanol groups of hydrolyzed 1C10. These results provide a facile approach to the fine structural control of nanohybrid materials assembled from single siloxane-based molecules.

    Original languageEnglish
    Pages (from-to)155-160
    Number of pages6
    JournalJournal of Colloid and Interface Science
    Volume350
    Issue number1
    DOIs
    Publication statusPublished - 2010 Oct

    Fingerprint

    Siloxanes
    Alkanes
    Alcohols
    Paraffins
    Molecules
    Lamellar structures
    Polycondensation
    Chain length
    Self assembly
    Pore size
    Hydrolysis
    Evaporation
    silanol
    alkoxyl radical

    Keywords

    • Alkoxysilanes
    • Amphiphilic molecules
    • Inorganic-organic hybrids
    • Mesophase
    • Self-assembly
    • Silica

    ASJC Scopus subject areas

    • Surfaces, Coatings and Films
    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • Colloid and Surface Chemistry

    Cite this

    Effect of organic additives on the formation of alkylsiloxane mesophases. / Shimojima, Atsushi; Sakurai, Mikako; Kuroda, Kazuyuki; Okubo, Tatsuya.

    In: Journal of Colloid and Interface Science, Vol. 350, No. 1, 10.2010, p. 155-160.

    Research output: Contribution to journalArticle

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