Photoalignment of an azobenzene-based chromonic liquid crystal dispersed in triacetyl cellulose: Single-layer alignment films with an exceptionally high order parameter

Masaki Matsumori, Ayami Takahashi, Yasushi Tomioka, Takaaki Hikima, Masaki Takata, Takashi Kajitani, Takanori Fukushima

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Single-layer thin alignment films of dye molecules are of growing importance, particularly for state-of-the-art LCD technology. Here we show that a sequential process involving the photoalignment and humidification of a chromonic liquid crystalline azobenzene (brilliant yellow; BY) dispersed in a triacetyl cellulose (TAC) matrix gives a thin alignment film with an exceptionally high order parameter (0.81). Spectroscopic and X-ray diffraction analyses of a BY/TAC composite film in each alignment process revealed that brief humidification triggers restructuring of the BY assembly from 1D nematic-like order to anisotropic 2D columnar order, resulting in the dramatic increase in the order parameter.

Original languageEnglish
Pages (from-to)11074-11078
Number of pages5
JournalACS Applied Materials and Interfaces
Volume7
Issue number21
DOIs
Publication statusPublished - 2015 Jun 3
Externally publishedYes

Keywords

  • alignment film
  • azobenzene dye
  • chromonic liquid crystal
  • order parameter
  • photoalignment

ASJC Scopus subject areas

  • Materials Science(all)

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