Azobenzene-siloxane hybrids with lamellar structures from bridge-type alkoxysilyl precursors

Sufang Guo, Watcharop Chaikittisilp, Tatsuya Okubo, Atsushi Shimojima

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Lamellar azobenzene-siloxane hybrids were prepared by controlled hydrolysis and polycondensation of three types of precursors, where azobenzene is sandwiched by mono-, di- and triethoxysilyl groups using propylene linkers. All precursors underwent reversible and fast trans-cis isomerization upon UV/Vis irradiation in dilute solution. Upon hydrolysis of the triethoxysilylated precursor in a homogeneous solution under acidic conditions, precipitation occurred by self-assembly of hydrolyzed monomers into a lamellar structure. Although di- and mono-ethoxysilylated precursors produced less ordered products under identical conditions, highly ordered lamellar films were obtainable either by evaporation induced self-assembly of the hydrolyzed monomers or by solid-state reactions of precursor films. The degree of trans-cis isomerization of azobenzene moieties in the hybrid films was enhanced by decreasing the cross-linking degree of siloxane networks using precursors with less condensable alkoxy groups.

    Original languageEnglish
    Pages (from-to)25319-25325
    Number of pages7
    JournalRSC Advances
    Volume4
    Issue number48
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    Siloxanes
    Lamellar structures
    Azobenzene
    Isomerization
    Self assembly
    Hydrolysis
    Monomers
    Polycondensation
    Solid state reactions
    Propylene
    Evaporation
    Irradiation
    azobenzene

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Chemistry(all)

    Cite this

    Azobenzene-siloxane hybrids with lamellar structures from bridge-type alkoxysilyl precursors. / Guo, Sufang; Chaikittisilp, Watcharop; Okubo, Tatsuya; Shimojima, Atsushi.

    In: RSC Advances, Vol. 4, No. 48, 2014, p. 25319-25325.

    Research output: Contribution to journalArticle

    Guo, Sufang ; Chaikittisilp, Watcharop ; Okubo, Tatsuya ; Shimojima, Atsushi. / Azobenzene-siloxane hybrids with lamellar structures from bridge-type alkoxysilyl precursors. In: RSC Advances. 2014 ; Vol. 4, No. 48. pp. 25319-25325.
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