Precise dielectric spectroscopy of a dual-frequency nematic mixture over a broad temperature range

W1832A, a dual-frequency, multi-component nematic mixture prepared at the Military University of Technology, was investigated by means of dielectric spectroscopy over a wide frequency range (100 Hz–10 MHz) and over a wide temperature range (−60°C–100°C). At the temperature of −60°C it is still a nematic. The investigated mixture changes the sign of dielectric anisotropy at temperature and frequency domains. High-precision dielectric spectroscopy studies of molecular motions (around short (S) and long (L) molecular axes) were performed using cells of 5 μm thickness. Gold electrodes in measuring cells were spin-coated with agents for homogenous and homeotropic alignments. In the low-temperature region these motions are hindered enough to observe intra-molecular motions, which typically (at room temperature) are observed in THz frequency range of the measuring field. S molecular motion is eliminated from the measurement range at temperatures below −15°C, while L mode is still observed at −60°C. Dielectric sp...