Investigations of dual-frequency nematic liquid crystals doped with dichroic dye

What is it about?

In this work, we studied and analysed a particular variety of liquid crystals, the so-called dual-frequency nematic liquid crystals (DFNLCs). The interest was to perform dielectric spectroscopy and optical characterisation with two pure and doped mixtures of DFNLCs. By means the dielectric spectroscopy we observed a low value of crossover frequency at room temperature for one dye-doped mixture. Additionally, in the spectra studies, a scattering of light at cross-frequency​, and a stable and unstable focal conical state was observed, respectively, for the investigated mixtures.

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Why is it important?

One of the most important aspect that we have observed, in dielectric spectroscopy, is the behaviour of the mixture 1832B plus the dichroic dye (0.6 wt%) at the crossover frequency. For this mixture,​ the crossover frequency was found shifted before 1.2 kHz with respect to the same pure mixture 1832B.