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Matsumori M, Takahashi A, Tomioka Y, et al. Photoalignment of an azobenzene-based chromonic liquid crystal dispersed in triacetyl cellulose: single-layer alignment films with an exceptionally high order parameter. ACS Appl Mater Interfaces. 2015;7(21):11074-8doi: 10.1021/acsami.5b02577.
Matsumori, M., Takahashi, A., Tomioka, Y., Hikima, T., Takata, M., Kajitani, T., & Fukushima, T. (2015). Photoalignment of an azobenzene-based chromonic liquid crystal dispersed in triacetyl cellulose: single-layer alignment films with an exceptionally high order parameter. ACS applied materials & interfaces, 7(21), 11074-8. https://doi.org/10.1021/acsami.5b02577
Matsumori, Masaki, et al. "Photoalignment of an azobenzene-based chromonic liquid crystal dispersed in triacetyl cellulose: single-layer alignment films with an exceptionally high order parameter." ACS applied materials & interfaces vol. 7,21 (2015): 11074-8. doi: https://doi.org/10.1021/acsami.5b02577
Matsumori M, Takahashi A, Tomioka Y, Hikima T, Takata M, Kajitani T, Fukushima T. Photoalignment of an azobenzene-based chromonic liquid crystal dispersed in triacetyl cellulose: single-layer alignment films with an exceptionally high order parameter. ACS Appl Mater Interfaces. 2015 Jun 03;7(21):11074-8. doi: 10.1021/acsami.5b02577. Epub 2015 May 20. PMID: 25984633.
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ACS Appl Mater Interfaces. 2015 Jun 03;7(21):11074-8. doi: 10.1021/acsami.5b02577. Epub 2015 May 20.

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

ACS applied materials & interfaces

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

Affiliations

  1. †Hitachi Research Laboratory, Hitachi, Ltd., 7-1-1 Omika, Hitachi, Ibaraki 319-1292, Japan.
  2. ‡Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
  3. #RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.

PMID: 25984633 DOI: 10.1021/acsami.5b02577

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.

Keywords: alignment film; azobenzene dye; chromonic liquid crystal; order parameter; photoalignment

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