Structure-sensitive bend elastic constants between piconewton and subnanonewton in diphenylacetylene-core-based liquid crystals

Satoshi Aya, Shohei Ogino, Yoshihiro Hayashi, Kunihiko Okano, Damian Pociecha, Khoa V. Le, Fumito Araoka, Susumu Kawauchi, Ewa Gorecka, Nataša Vaupotič, Hideo Takezoe, Ken Ishikawa

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Elastic constants in liquid crystals are known to be in the range of pico- and several-tens piconewton (pN). We report herein that a bend elastic constant, K33, remarkably varies depending on a slight modification of the chemical structure in an analogous series of calamitic liquid crystals. In contrast to the record-high bend elastic constants (hundreds pN or sub-nN) reported previously in a compound with an azo linkage, analogous compounds with tolan and ester linkages show several-tens pN and pN, respectively. X-ray diffraction studies of these compounds reveal that smectic-like layer structures (cybotacticclusters) are formed in the nematic phase of only the homologous compounds with an azo linkage, certifying the idea that the existence of cybotactic clusters strongly enhances K33. Two theoretical considerations were made: (1) Based on molecular conformation calculation, flat molecules that have high torsional potential energy, such as the one with an azo linkage, easily pack to form cybotactic clusters. (2) Theoretical estimation was made of how much cluster volume ratio is necessary to give about 100-times-larger K33s.

本文言語English
論文番号042506
ジャーナルPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
90
4
DOI
出版ステータスPublished - 2014 10 31

ASJC Scopus subject areas

  • 統計物理学および非線形物理学
  • 統計学および確率
  • 凝縮系物理学

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