Medical and Technical Applications of Liquid Cryst

Authors: J G Grabmaier

Publish Date: 1975

Volume: , Issue: , Pages: 83-160

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Abstract

Certain cholesteric liquid crystals exhibit color changes over the entire color scale from red to violet when a variable of state such as the temperature of the liquid crystal is changed over a particular range The process is normally reversible and the colors occur in the reverse sequence with falling temperature to that with rising temperature A simple method is therefore presented of measuring surface temper­atures of utilizing color differences to indicate temperature variations and of following dynamic processes such as thermal diffusion Similar color shifts are also obtainable by changing electric or magnetic fields by changing the pressure and by changing the concentration of gases or vapors

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