Impact of homeotropic and planar alignment of liquid crystalline medium on the structure and dielectric properties of modified fullerene mC₆₀+ E25M mixtures

Nano-Objects and Ions in Liquid Crystals: Ion Trapping Effect and Related Phenomena

“…Thicker cells (~25 m  ) and higher concentrations of the modified fullerenes (0.1-3 wt. %) in the nematic liquid crystal E25M (cyanobiphenyls/terphenyl mixture) were explored in [120]. It was found that liquid crystals doped with modified fullerenes exhibit higher electrical conductivity than their non-doped counterparts; and the experimental data can be satisfactorily described by the simple power law Equation ( (homeotropic alignment).…”

“…Table 2 provides a short summary of the reported effects. As can be seen, both decrease [118,119,[121][122][123][124][125][126][127][143][144][145][146][147][148][149][150][151][152] and increase [105,120,[128][129][130][131][132][133][134][135][136][137][138][139][140][141][142][150][151][152][153] in the electrical conductivity of liquid crystals doped with carbon-based nanomaterials were reported.…”

“…All studied samples exhibited a high degree of aggregation with the percolation threshold at 2.0-2.5 wt. % [120].…”

Influence of Li-TCNQ impurities on dielectric properties of planar-oriented nematic liquid crystal

“…All measurements were performed within the temperature range 293 to 343 K. The temperature stabilization error during measurements did not exceed 0.5 K. The frequency dependences of C and R were measured using the oscilloscopic method [7]. The alternating voltage of the triangular shape with the amplitude U 0 = 0.25 V within the frequency range ƒ = 10 -1 …10 6 Hz was applied to the sample.…”

“…The purpose of this work was to study the possibility of increasing the conductivity of the liquid crystal mixture E25M by introducing Li-TCNQ impurities [1][2][3][4][5]. Earlier [6], we showed that introduction of the modified C60 impurity into E25M liquid crystal leads to an increase in the conductivity of liquid crystal. Since Li-TCNQ impurity, in contrast to the C60 one, absorbs light better in the visible spectral region, then, in addition to changing the electrical properties, when this impurity is introduced into the liquid crystal, the optical properties of liquid crystal must also change.…”