Improved dielectric and electro-optical parameters of ZnO nano-particle (8% Cu2+) doped nematic liquid crystal

Tripathi, Pankaj Kr; Misra, Abhishek Kumar; Manohar, Shashwati; Gupta, Swadesh Kumar; Manohar, Rajiv

doi:10.1016/j.molstruc.2012.10.052

Cited by 54 publications

(28 citation statements)

References 21 publications

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“…The threshold voltage was determined by measuring the intensity of transmitted light by a given cell as a function of applied voltage. By changing the voltage stepwise and then detecting the change in the transmitted light intensity, we have determined the threshold voltage (the voltage, under which the transmitted intensity changed by the 10%) [43]. Figure 5 shows the variation of threshold voltage with concentration of NPs.…”

Section: Resultsmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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In the present investigation, TiO 2 -doped weakly polar nematic liquid crystal (NLC) has been studied. This study mainly focuses on dielectric, electro-optical and optical properties of pure NLC and doped systems. Variation in different parameters like dielectric permittivity, dielectric loss, dielectric anisotropy and conductivity has been noticed. Permittivity of the doped system is almost the same as undoped system. With doping concentration, the ionic contribution to the dielectric loss as observed in low-frequency region has been suppressed and the shift in relaxation frequency toward higher frequency side has also been observed. The electrical conductivity and threshold voltage have been decreased with increasing concentration of nanoparticles (NPs). The continuous increase in dielectric anisotropy with increasing the concentration of NPs has also been observed. These results have been attributed to the trapping capability of free ions by TiO 2 NPs. Further, we focused on the study of photoluminescence (PL), UV absorbance and Fourier transformed infrared spectroscopy (FTIR) of pure and doped systems. The continuous increase in PL intensity without any shift in emission peak has been observed for doped systems. Enhancement in UV absorbance with increasing concentration of NPs has also been observed. The effect of NPs doping on molecular dynamics of NLC can be clearly seen by FTIR study. The results suggest that the TiO 2 NP-doped weakly polar NLC can have significant improved dielectric, electro-optical and optical properties. This makes the weakly polar NLC to be a potential candidate for many applications.

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Section: Resultsmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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“…The dielectric anisotropy depends upon the angle b and the order parameter [24]. The trend of dielectric anisotropy shown in Fig.…”

Section: Resultsmentioning

confidence: 95%

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

et al. 2014

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Poly(isobutyl methacrylate) (PiBMA) polymer doped in pure p‐Ethoxybenzylidene p‐Heptylaniline (EBHA) mesomaterial has been investigated in the present study. The dielectric and electro‐optical parameters of EBHA having nematic phase were altered due to the addition of polymer in different concentration. The strong dopant concentration dependent nature of negative dielectric anisotropy and conductivity are the interesting results of the present polymer doped nematic liquid crystal (NLC) system. The present composite shows its useful application in low charge consumable devices due to the easy charge transportation phenomenon. The investigated polymer doped‐NLC system exhibiting increased negative dielectric anisotropy and high conductivity may prove to be advantageous for video applications in vertically aligned cells. POLYM. ENG. SCI., 55:414–420, 2015. © 2014 Society of Plastics Engineers

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“…It was observed that the doping of 1% of nanoparticles has causedvariation in almost all the properties of the NLC under consideration. 8 Thus we have prepared a LC mixture of 5CB and NiO nanoparticles to improve its dielectric and optic properties.…”

Section: 4mentioning

confidence: 99%

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

Jamwal

Prakash

Chandran

et al. 2015

AIP Conference Proceedings

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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.

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Improved dielectric and electro-optical parameters of ZnO nano-particle (8% Cu2+) doped nematic liquid crystal

Cited by 54 publications

References 21 publications

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Effects of polymer doping on dielectric and electro-optical parameters of nematic liquid crystal

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

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