Abstract

Chiral nematic polar mixtures (7BCB-7CN)-5<SUP>*</SUP>CB were investigated by visual and spectrophotometric methods. It was found that these systems have a reverse temperature dependence of selective light reflection. The wavelength of reflected light increased with the temperature increase. The bicomponent mixture containing 5<SUP>*</SUP>CB and non-polar 805, showing enhanced A<SUB>1</SUB> phase, had a normal spectral characteristics. The color of reflected light changed from red to blue with temperature increase in the neighborhood of S<SUB>A1</SUB>-N<SUP>*</SUP> phase transition.

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