Effect of nickel oxide nanoparticles on dielectric and optical properties of nematic liquid crystal

Abstract

Articles you may be interested inTunability of optical memory in ferroelectric liquid crystal containing polyvinylpyrrolidone capped Ni nanoparticles for low power and faster device operation Appl. Phys. Lett. 101, 074109 (2012) Corresposnding author, E-mail: jpsphysics@gmail.com, Tel: 0164-2864217 Abstract. In the present paper, we have studied the improvement in dielectric and optical properties of nematic liquid crystal (NLC) by doping of nickel oxide (NiO) nanoparticles. We have observed the dielectric and optical properties of pure and doped cells in order to understand the influence of NiO nanoparticles in the pure NLC. The experimental results have been analyzed through dielectric spectroscopic and optical texural methods.Detailed studies of dielectric parameters such as dielectric permittivity, dielectric loss and dielectric loss factor as a function of frequency with temperature were carried out. It has been observed that on doping the nanoparticles in NLC, the value of dielectric parameters (dielectric permittivity, dielectric loss and dielectric loss factor) decreases. The impedance and resistance of both pure and nanoparticles doped NLC cells were studied and found that for doped NLC, these parameter have low value. In addition to this, optical textures of the pure and doped samples have also been observed with a polarizing optical microscope at room temperature. All the results i.e. related to the investigation of dielectric and electro-optic properties have been explained by using existing theory of NLC.

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

“…The study of dielectric and electro-optical properties of dispersed systems obtained by the dispersion of magnetic NPs (MNPs) into nematic LCs has been found to be very interesting [18][19][20]. Godovinova et al [18] measured the T NI of nematic LC 6CHBT dispersed with spherical or calamitic MNPs and found that the ferronematics dispersed with rod-like MNPs have higher T NI than the host nematic or ferronematics containing NPs of spherical shape.…”

“…Large increase in the dielectric properties have been observed on increasing the NPs concentration from 1 to 10 wt%. Jamwalet al [20] studied the effect of nickel oxide (NiO) NPs on the dielectric and electro-optical properties of nematic LC 5CB and observed that due to the presence of NiO NPs the values of dielectric permittivity (ε ), dielectric loss (ε") and tan δ are decreased whereas the optical contrast has improved. The decrease of tan δ shows the low relaxation frequency of the ions.…”

Nematic liquid crystal/dimethylsulphoxide mixture based tuning condenser

“…The impact of LC on modern technology such as a biosensor, memory devices, LC-based lasers, holography has been profound [8,9]. Besides these modern familiar applications, there are other devices with improved properties of LC by doping nanoparticles or mixing with other inorganic/organic solvents as LCs are favorable material for the effective transfer of ions and electrons [6,[10][11][12][13].…”

Prospects of Emerging Engineered oxide nanomaterials and their Applications

“…In addition to above, reduction in crystal size would significantly increase the sensor performance and the band gap engineering by possible modification of MON which is one of the most exciting research area. Therefore, by altering these characteristics, the structural, sensing, optical and chemical properties of MON may be tuned and adapted to their potential to facilitate both fundamental research and practical applications through their advantageous chemical and physical properties [43][44][45][46][47][48][49][50] . Their novel properties can be tailored significantly by producing them at nanoscale in different morphologies.…”