New Thermochromic Liquid Crystals

  • D. G. McDonnell
  • I. Sage


Liquid crystals are organic compounds which possess ordered fluid phases combining solid-like optical properties with liquid-like flow. The materials exploited for thermometric and thermographic use display a cholesteric (or chiral nematic) phase which has a helical disposition of molecules imposed by an asymmetry in their structure. The less mobile smectic phase, by contrast, is ordered into layers which cannot accommodate such a twisted structure. This smectic phase may appear in the same material as a cholesteric phase, on cooling to a lower temperature. A third liquid crystal phase, the nematic, contains symmetric molecules, has no intrinsic twist in its structure and is used in electro-optic devices.


Liquid Crystal Cholesteryl Ester Nematic Liquid Crystal Liquid Crystal Phase Smectic Phase 
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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • D. G. McDonnell
    • 1
  • I. Sage
    • 1
  1. 1.Royal Signals and Radar EstablishmentMalvern, Worcs and BDH Chemicals Ltd.Poole, DorsetUK

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