Applicability of TiO2 nanoparticle towards suppression of screening effect in nematic liquid crystal

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

“…Complicated behavior of the same nematic liquid crystal 5CB doped with 2 TiO nanoparticles (0.1-2 wt. %) was also reported in [183,184]. An increase in the concentration of 2 TiO nanoparticles from 0 wt% to 0.2 wt% led to the unexpected increase in the concentration of ions n (from .…”

“…Electrical properties of liquid crystals doped with metal oxide nanoparticles were reported in many papers summarized in Table 4 [173][174][175][176][177][178][179][180][181][182][183][184][185][186][187][188][189][190]. [173,174].…”

“…These experimental facts suggest that the contamination process dominates at the low concentration of nanoparticles in liquid crystals, and the purification of liquid crystals comes into effect at higher concentrations of nanoparticles. An important conclusion for practical applications is to use purified nanoparticles as dopants for liquid crystals (according to [183,184], 2 TiO nanoparticles were not purified before their use as dopants for liquid crystals). The non-monotonous behavior of the measured electrical parameters as a function of the nanoparticles loading deserves additional experimental and theoretical studies [183,184].…”

Impact of Dispersion of Nanoscale Particles on the Properties of Nematic Liquid Crystals

“…In recent years, various kinds of nanoparticles [2][3][4][5][6][7][8][9][10][11] or quantum dots [12][13][14][15][16][17] have been dispersed/doped in the host nematic matrix and their properties have been investigated. Singh et al [2] found that due to dispersion of silver nanoparticles (Ag NPs) (0.2 and 0.5 wt% concentrations) into nematic matrix 4-(trans-4-n-hexylcyclohexyl) isothio-cyanatobenzoate (6CHBT) the nematic-isotropic (NI) transition temperature (T NI ) and the conductivity anisotropy have increased whereas the threshold voltage (V th ) has decreased.…”

“…The V th is the minimum voltage required by the LC molecules to switch from homeotropic (dark) state to homogeneous (bright) state. Yadav et al [3,4] have addressed the question how the dispersion of tin oxide (TiO 2 ) NPs in host nematic matrix 4-cyano-4 -n-pentylbiphenyl (5CB) influences the ionic behavior and the screening effect in nematic LC. These works have shown that the TiO 2 NPs serve the role of an effective absorber for ions.…”