Lattice matching in the epitaxial formation of mesostructured silica films

Hirokatsu Miyata, Shimon Kobori, Wataru Kubo, Masatoshi Watanabe, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Crystallographic orientation of mesostructured silica films on a substrate drastically changes when the substrate is modified with an anisotropic surface. The «01» axis of a two-dimensional (2D) hexagonal structure of the film prepared on a polyimide surface using C22EO20 as a structure-directing agent changes from perpendicular to parallel with respect to the substrate after a rubbing treatment of polyimide, which is accompanied by the simultaneous unidirectional alignment of the cylindrical pores in the plane of the film. The normal direction of the film is «21», which has never been observed in the mesostructured silica films reported so far including those with controlled in-plane alignment of the mesochannels. The change of the orientation with respect to the substrate can be explained by the increased lateral distance between the adjacent surface micelles, which is caused by the elongation of the alkyl chains of the surfactant molecules induced by the adsorption onto the polymer surface with a molecular-level anisotropy. These results show that the total structural orientation of the mesostructured silica film is determined by the matching of the intrinsic lattice constant of the mesostructured silica with that of the surface micelle structure on a substrate.

    Original languageEnglish
    Pages (from-to)761-765
    Number of pages5
    JournalLangmuir
    Volume29
    Issue number2
    DOIs
    Publication statusPublished - 2013 Jan 15

    Fingerprint

    Silicon Dioxide
    Silica
    silicon dioxide
    Substrates
    Micelles
    polyimides
    Polyimides
    micelles
    alignment
    Surface-Active Agents
    elongation
    Lattice constants
    Elongation
    Polymers
    Anisotropy
    Surface active agents
    surfactants
    porosity
    Adsorption
    anisotropy

    ASJC Scopus subject areas

    • Electrochemistry
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Materials Science(all)
    • Spectroscopy

    Cite this

    Lattice matching in the epitaxial formation of mesostructured silica films. / Miyata, Hirokatsu; Kobori, Shimon; Kubo, Wataru; Watanabe, Masatoshi; Kuroda, Kazuyuki.

    In: Langmuir, Vol. 29, No. 2, 15.01.2013, p. 761-765.

    Research output: Contribution to journalArticle

    Miyata, Hirokatsu ; Kobori, Shimon ; Kubo, Wataru ; Watanabe, Masatoshi ; Kuroda, Kazuyuki. / Lattice matching in the epitaxial formation of mesostructured silica films. In: Langmuir. 2013 ; Vol. 29, No. 2. pp. 761-765.
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