Historical Overview of Polar Liquid Crystals

  title={Historical Overview of Polar Liquid Crystals},
  author={Hideo Takezoe},
  pages={1 - 17}
  • H. Takezoe
  • Published 30 July 2014
  • Physics, Chemistry
  • Ferroelectrics
Brief history of ferroelectric and antiferroelectric liquid crystals is described. To reduce the symmetry of the molecular systems, two ideas were successfully used; introductions of chirality and molecular shape asymmetry. The chirality introduced into rod-shaped and disc-shaped molecular systems led to chiral smectic C and chiral discotic columnar phases. Dogleg from rod and cone or bowl from disc in molecular shapes brought about polar organization by their packing, realizing so-called… 
Polar liquid crystals – ferro, antiferro, banana, and columnar –
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A ferroelectric instability is predicted to occur in an experimentally accessible temperature range in a main-chain (semiflexible) liquid crystalline polymer with directed polar mesogenic segments.
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A smectic liquid-crystal phase made from achiral molecules with bent cores was found to have fluid layers that exhibit two spontaneous symmetry-breaking instabilities: polar molecular orientational
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The helical pitch and the optical rotatory power (ORP) were measured in the subphases of an antiferroelectric liquid crystal. These measurements clearly indicate the existence of a macroscopic
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The B4, a locally layered phase with hexatic or semicrystalline ordering of the layers, showing large optical rotation and light scattering which suggests a strongly chiral local structure, is shown.