Mesophase of colloidally dispersed nanosheets prepared by exfoliation of layered titanate and niobate

Teruyuki Nakato, Yoshie Yamashita, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    Colloidal dispersion of oxide nanosheets was prepared by exfoliation of lepidocrocite-type layered titanate H1.07Ti1.73O 4, and the obtained "nanosheet colloid" formed a liquid crystalline phase which was detected by birefringence of the colloid with naked-eye and optical microscope observations between crossed polarizers. The nanosheet colloids exhibited phase transition from isotropic to isotropic-liquid crystalline biphasic, and finally to full liquid crystalline, as the nanosheet concentration increased. The mesophase was characterized by the stability; liquid crystallinity appeared at low particle concentrations due to high aspect ratio (around 1 nm of thickness and ∼7 μm of lateral length) of the nanosheets. Mixing the titanate nanosheet colloid with hectorite clay yielded apparently homogeneous birefringent colloids, where a cationic cyanine dye was selectively adsorbed onto the clay nanosheets.

    Original languageEnglish
    Pages (from-to)24-28
    Number of pages5
    JournalThin Solid Films
    Volume495
    Issue number1-2
    DOIs
    Publication statusPublished - 2006 Jan 20

    Fingerprint

    Nanosheets
    niobates
    colloids
    Colloids
    liquids
    clays
    Liquids
    Crystalline materials
    Clay
    polarizers
    high aspect ratio
    optical microscopes
    birefringence
    crystallinity
    dyes
    microscopes
    Birefringence
    Oxides
    Aspect ratio
    oxides

    Keywords

    • Exfoliation
    • Liquid crystal
    • Monolayers
    • Titanium oxide

    ASJC Scopus subject areas

    • Surfaces, Coatings and Films
    • Condensed Matter Physics
    • Surfaces and Interfaces

    Cite this

    Mesophase of colloidally dispersed nanosheets prepared by exfoliation of layered titanate and niobate. / Nakato, Teruyuki; Yamashita, Yoshie; Kuroda, Kazuyuki.

    In: Thin Solid Films, Vol. 495, No. 1-2, 20.01.2006, p. 24-28.

    Research output: Contribution to journalArticle

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