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New Thermochromic Liquid Crystals

  • D. G. McDonnell
  • I. Sage

Abstract

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.

Keywords

Liquid Crystal Cholesteryl Ester Nematic Liquid Crystal Liquid Crystal Phase Smectic Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    D. G. McDonnell, R. A. Smith (In press).Google Scholar
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    For further details contact M. G. Pellatt, BDH Chemicals Ltd, Poole, England.Google Scholar
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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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