Thermal switching characteristics based on smectic-A ↔ chiral nematic phase transitions of (liquid crystals/chiral dopant) composites, with and without side chain-type liquid crystalline polymer

Huai Yang, Hirotsugu Kikuchi, Tisato Kajiyama

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The light switching characteristics induced by a thermal smectic A (SMA) ↔ chiral nematic (N*) phase transition were studied for homeotropically aligned [smectic A liquid crystal (SmA-LC)/nematic liquid crystal (N-LC)/chiral dopant] and [side chain type smectic A liquid crystalline polymer (SmA-LCP)/N-LC/chiral dopant] composites. A drastic change from a transparent SmA phase to a light-scattering N* phase occurred in both composites upon heating. In the case of the heat-induced N* phase for the (SmA-LC/N-LC/chiral dopant) composite, the N* phase exhibited weak light scattering due to formation of a scroll texture. On the other hand, in the case of the heat-induced N* phase for the (SmA-LCP/N-LC/chiral dopant) composite, the N* phase showed strong light scattering due to formation of a focalconic texture. The existence of a SmA-LCP was responsible for a higher contrast ratio between the transparent SmA phase and the light scattering N* phase for the (SmA-LCP/N-LC/chiral dopant) composite than for the (SA-LCN/N-LC/chiral dopant) composite.

Original languageEnglish
Pages (from-to)1141-1149
Number of pages9
JournalLiquid Crystals
Volume29
Issue number9
DOIs
Publication statusPublished - Sep 1 2002

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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