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

Teruyuki Nakato, Yoshie Yamashita, Kazuyuki Kuroda

Research output: Contribution to journalConference articlepeer-review

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

Keywords

  • Exfoliation
  • Liquid crystal
  • Monolayers
  • Titanium oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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