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

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


研究成果: Conference contribution


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.

ホスト出版物のタイトルEmerging Liquid Crystal Technologies VII
出版ステータスPublished - 2012
イベントEmerging Liquid Crystal Technologies VII - San Francisco, CA, United States
継続期間: 2012 1月 222012 1月 25


名前Proceedings of SPIE - The International Society for Optical Engineering


ConferenceEmerging Liquid Crystal Technologies VII
国/地域United States
CitySan Francisco, CA

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学


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