Pre-organized liquid crystals: Biaxial nature of laterally-connected dimer

Isa Nishiyama, Yuka Tabe, Jun Yamamoto, Yoichi Takanishi, Yoko Ishii, Hiroshi Yokoyama

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Biaxial nematic liquid crystals have attracted much attention from both fundamental and application points of view, because the fast response based on the rotation of the minor director is expected. So far, different molecular designs have been proposed for the emergence of the biaxial nematic phase. Among that, we have been interested in applying "preorganization" concept on generating the biaxiality. Dimeric liquid crystal compounds have been prepared in line with this concept in which two mesogenic parts are linked by the biphenyl connecting group. The pre-organized dimmer shows an anomalous textural change, for vertically-aligned and free-standing film samples, at the smectic C (SmC)- nematic (N) phase transition, in which the Schlieren texture of the SmC changes into the other Schlieren texture of the N phase. There are two possible explanations for this textural change, i.e., the occurrence of the director change at the SmC-N phase transition or the emergence of biaxiality in the N phase. The electric-field-induced birefringence has also been measured in detail for investigating the biaxial nature of the sample.

    Original languageEnglish
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
    Volume8279
    DOIs
    Publication statusPublished - 2012
    EventEmerging Liquid Crystal Technologies VII - San Francisco, CA
    Duration: 2012 Jan 222012 Jan 25

    Other

    OtherEmerging Liquid Crystal Technologies VII
    CitySan Francisco, CA
    Period12/1/2212/1/25

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    Keywords

    • biaxiality
    • electric-field-induced birefringence
    • molecular design
    • nematic
    • pre-organization
    • texture

    ASJC Scopus subject areas

    • Applied Mathematics
    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Nishiyama, I., Tabe, Y., Yamamoto, J., Takanishi, Y., Ishii, Y., & Yokoyama, H. (2012). Pre-organized liquid crystals: Biaxial nature of laterally-connected dimer. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8279). [827903] https://doi.org/10.1117/12.913573