Investigation of dielectric and electro-optical properties of nematic liquid crystal with the suspension of biowaste-based porous carbon nanoparticles

Singh, Bhupendra Pratap; Pathak, Govind; Roy, Aradhana; Hegde, Gurumurthy; Tripathi, Pankaj Kumar; Srivastava, Atul; Manohar, Rajiv

doi:10.1080/02678292.2019.1606354

Cited by 24 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Any visible agglomerations or significant defects have not been observed. The uniformity of POM color in the entire bright state has also confirmed that the LC molecules are uniformly aligned in the nematic matrix of the E7 LC [37][38][39][40][41]. However, the dispersion of MWCNTs in the E7 LC into different concentrations leads to the change in color of POMs, which is associated to the change in refractive index and/or birefringence (∆n) as reported previously [42][43][44].…”

Section: Resultssupporting

confidence: 82%

“…The dielectric spectra of the pure E7 and LC-MWCNT composites in the HA and VA configuration were measured using a LCR meter (Hioki 3532-50, Tokyo, Japan) with an applied alternating field of 0.01 V/µm in the frequency regime of 42 Hz to 5.5 MHz to obtain the real and imaginary parts of complex dielectric permittivity. The ∆n of the LCs was determined by using the phase retardation technique [32,37].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Singh

Sikarwar

Pandey³

et al. 2021

Electronic Materials

Self Cite

View full text Add to dashboard Cite

In this paper, we investigate a commercial nematic liquid crystal (LC) mixture namely E7 dispersed with small concentrations of multi-walled carbon nanotubes (MWCNTs). The dielectric and electro-optical characterizations have been carried out in the homogeneously and vertically aligned LC cells. The electro-optical response of LC molecules has been enhanced by 60% after the addition of MWCNTs, which is attributed to the reduced rotational viscosity in the composites. MWCNTs act like barricades for ionic impurities by reducing them up to ∼34.3% within the dispersion limit of 0.05 wt%. The nematic–isotropic phase transition temperature (TNI) of the E7 LC has also been shifted towards the higher temperature, resulting in a more ordered nematic phase. The enhanced birefringence and orientational order parameter in the LC-MWCNTs are attributed to π-π electron stacking between the LC molecules and the MWCNTs. The outlined merits of the LC-MWCNTs composites evince their suitability for ultrafast nematic-based electro-optical devices.

show abstract

Section: Resultssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Singh

Sikarwar

Pandey³

et al. 2021

Electronic Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our previously published work contains a detailed description of the sample cell fabrication process. 29 , 35 , 36 The thickness was confirmed by the optical interferometric method and found to be ∼5.2 ± 0.05 μm. The concentration was set to 0, 5.0 × 10 11 , 5.0 × 10 12 , 2.5 × 10 13 , and 5.0 × 10 13 nanospheres in pure LC.…”

Section: Methodsmentioning

confidence: 92%

Chemically Functionalized Gold Nanosphere-Blended Nematic Liquid Crystals for Photonic Applications

et al. 2023

Self Cite

View full text Add to dashboard Cite

A demand for functional materials that are capable of tailoring light-emissive properties has apparently been rising nowadays substantially for their utilization in organic optoelectronic devices. Motivated by such promising characteristics, we present highly emissive as well as aggregation-induced emission (AIE) electroluminescent composite systems composed of a nematic liquid crystals (NLC) blended with polyethylene-functionalized gold nanospheres (GNSs). The major findings of this study include superior electro-optical properties such as threshold voltage reduction by around 24%. The fall time is reduced by 11.50, 30.33, 49.33, and 63.17% respectively, and rotational viscosity is reduced by 13.86, 32.77, 36.97, and 49.58% for 5.0 × 1011, 5.0 × 1012, 2.5 × 1013, and 5.0 × 1013 number of GNS-blended liquid crystal (LC) cells. The increased UV absorbance and greatly enhanced luminescence properties have been attributed to surface plasmon resonance near the surface of GNSs and AIE effect risen due to agglomeration of the capping agent with the NLC molecules respectively, and these characteristics make them suitable for new-age display applications.

show abstract

“…The birefringence (∆n) is defined as the difference between extra-ordinary (n e ) and ordinary (n o ) components of the refractive index of material. The details about birefringence measurement are given in reference [14,46]. The optical birefringence of weakly polar nematic and TiO 2 NPs doped composites has been obtained by equation 6.…”

Section: Experimental Details and Measurement Techniquesmentioning

confidence: 99%

Enhanced Electro-optical Properties of Low Viscous Nematic Liquid Crystal Doped with Mixed Phase Anatase/Rutile TiO<sub>2</sub> Nanoparticles for Display Applications

Singh¹,

Sikarwar²,

Misra³

et al. 2021

WJAC

View full text Add to dashboard Cite

Organic-inorganic composite based on liquid crystalline and TiO 2 nanoparticles were obtained and investigated taking into account the crystallographic form of TiO 2 i.e., anatase/rutile mixed phase. TiO 2 is an important class of material having various dielectric and electro-optical properties. The existent research presents the electro-optical properties of nematic liquid crystal (NLC) E204 and TiO 2 nanocomposites over an extensive range of frequencies. Various important display parameters such as response time, threshold voltage, pretilt angle and activation energy of pristine as well as TiO 2 doped composites systems were measured and analyzed. In comparison with the pure, TiO 2 -doped composite systems has approximately 50% faster response time, owing to its remarkable decline in the relaxation time and activation energy of the LCs. The alteration in the optical intensity of the NLC composites as a function of the concentration of TiO 2 nanoparticles (NPs) was also examined. It was established that the optical intensity in nano-nematic composites was decreasing with the concentration of TiO 2 NPs. Also, it was observed that an escalation in the TiO 2 NPs concentration in NLC composites indicates to an escalation in the birefringence. Probable mechanisms of the interactivity between NLC molecules and TiO 2 NPs have been discussed. The current work shows that the TiO 2 NPs doping has an encouraging application in the display devices, including other electro-optical as well as photonic applications.

show abstract

Investigation of dielectric and electro-optical properties of nematic liquid crystal with the suspension of biowaste-based porous carbon nanoparticles

Cited by 24 publications

References 38 publications

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Chemically Functionalized Gold Nanosphere-Blended Nematic Liquid Crystals for Photonic Applications

Enhanced Electro-optical Properties of Low Viscous Nematic Liquid Crystal Doped with Mixed Phase Anatase/Rutile TiO<sub>2</sub> Nanoparticles for Display Applications

Contact Info

Product

Resources

About

Investigation of dielectric and electro-optical properties of nematic liquid crystal with the suspension of biowaste-based porous carbon nanoparticles

Cited by 24 publications

References 38 publications

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

Chemically Functionalized Gold Nanosphere-Blended Nematic Liquid Crystals for Photonic Applications

Enhanced Electro-optical Properties of Low Viscous Nematic Liquid Crystal Doped with Mixed Phase Anatase/Rutile TiO&lt;sub&gt;2&lt;/sub&gt; Nanoparticles for Display Applications

Contact Info

Product

Resources

About

Enhanced Electro-optical Properties of Low Viscous Nematic Liquid Crystal Doped with Mixed Phase Anatase/Rutile TiO<sub>2</sub> Nanoparticles for Display Applications