Abstract
Dielectric spectra of a racemic liquid crystal (+/−)12F1M7 synthezised recently were measured as a function of temperature on planar and homeotropically aligned samples. The complex dielectric behaviour inside the apparent mesogenic phases studied is presented. Cells prepared on gold-coated glass substrates were used to obtain good characteristics in a wide frequency and temperature range. Additionally transparent indium-tin-oxide (ITO) with rubbed polyimide-coated glass substrates were also used for surface aligned samples. A pronounced difference between “ITO” and “gold” cells emerges due to surface conditions. The results are discussed with respect to earlier measurements on optically pure S(+)-12F1M7.
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