Electro-optical characterization of a weakly polar liquid crystalline compound influenced polyvinyl pyrrolidone capped gold nanoparticles

Singh, Bhupendra Pratap; Sikarwar, Samiksha; Agrahari, K; Tripathi, Shivangi; Gangwar, Rajesh K.; Manohar, Rajiv; Pandey, Kamal Kumar

doi:10.1016/j.molliq.2020.115172

Cited by 10 publications

(17 citation statements)

References 48 publications

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“…We have obtained response time and birefringence of the pure and doped composites using a He–Ne laser of wavelength 632.8 nm, a function generator Tektronix AFG‐3021B, a photodetector Instec PD02‐L1, turning stage, a digital oscilloscope Tektronix TDS‐2024C, and a hot plate Instec HCS 302. Complete detail of the setup and procedure is elaborated in our previously published article 14 . The voltage dependent transmittance of the samples was derived by making a He–Ne laser beam (10 mW, 632.8 nm) to fall normally on the sample cell.…”

Section: Methodsmentioning

confidence: 99%

“…In the literature, there are adequate reports suggesting that doped NPs enhance the properties of host LCs 5–7 . Sincere endeavors have been recorded worldwide to reinforce the properties of LCs by dispersion of various metal NPs such as gold NPs (GNPs), 8–14 silver NPs (AgNPs), 15–19 dye, 20–22 TiO 2 NPs 23,24 quantum dots (QDs), 25,26 carbon nanotubes (CNTs), 27,28 polymers, 29,30 and nanorods 31–33 …”

Section: Introductionmentioning

confidence: 99%

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Greenly synthesized porous carbon nanoparticle (bio‐waste‐based)‐doped nematic liquid crystal composite with optimized electric and electro‐optical properties for devices

et al. 2022

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The present investigation on the impact of porous carbon nanoparticles (PCNPs) on a room temperature nematic liquid crystalline compound (TP‐188‐01) reports extensive electro‐optical analysis of composite followed by dielectric and luminescence study as well. The pure nematic compound has been doped with 0.1%, 0.25%, and 0.5% of PCNPs (spherical), which have been synthesized by green synthesis technique without use of any activating agents. Low‐frequency dielectric analysis (50 Hz to 1 kHz) has been done to confirm ion generation with increase in PCNS concentration. The dielectric data also indicate preferential orientation of molecules from homogeneous to homeotropic alignment, which can be used in performance optimization of electro‐optical devices. The analysis of dielectric data also illustrates the application of PCNS‐doped systems in circuits operating at high voltages. Diffusion coefficient, mobility, and DC conductivity have been further examined to support the above observations. A significant decrease (of about 47%) in the response time of porous carbon nanoparticle liquid crystal (NP‐LC) composites has also been observed. The photoluminescence spectrum of NP‐LC composites as a function of carbon nanosphere (CNS) concentration has shown Quenching (following the Stern–Volmer quenching mechanism) in the luminescence intensity with increasing CNS concentration. The highly improved response time and quenching in the luminescence intensity further make the PCNS‐doped LC composites as ideal materials to be used in devices, encouraging LC‐aided green nanotechnology.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Greenly synthesized porous carbon nanoparticle (bio‐waste‐based)‐doped nematic liquid crystal composite with optimized electric and electro‐optical properties for devices

et al. 2022

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“…Then, 5 µm-thick cells, composed of two indium tin oxide (ITO) glass substrates, were constructed. The detailed process of sample cell fabrication could be obtained in our previous articles [10,32]. The cell thickness was estimated via the optical interferometry and found to be ∼5.3 ± 0.05 µm.…”

Section: Methodsmentioning

confidence: 99%

“…The response time was calculated by using an optical switching technique of the pure E7 and LC-MWCNT composites at room temperature (RT). Experimental setup and measurement techniques for voltage dependent transmission curve (V-T curve) and response time have already been reported in our previously published articles [10,32]. Crystal rotation method [35] was used to calculate the pre-tilt angles of the homogeneously (HA or ECB) and vertically aligned (VA) LC cells filled with the pure E7 and LC-MWCNT composites.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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

Singh

Sikarwar

Pandey³

et al. 2021

Electronic Materials

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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.

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Effect of Guest Particles on the Functional Dielectric Properties of Materials for Display Application

Avaish,

Warsi,

Dwivedi

et al. 2024

Macromolecular Symposia

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In this study the dielectric properties are experimentally studied and also analyzed the influence of guest particles on the functional properties of various liquid crystals. The polar and elastic energy of the nanoparticles is found to affect the functional energy of pure suspension. In addition to this, the functional dielectric anisotropy of the dispersed system takes modified form. In this study experiments are performed on various materials to find dielectric anisotropy and also found in good agreement with theoretical explanation.

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Electro-optical characterization of a weakly polar liquid crystalline compound influenced polyvinyl pyrrolidone capped gold nanoparticles

Cited by 10 publications

References 48 publications

Greenly synthesized porous carbon nanoparticle (bio‐waste‐based)‐doped nematic liquid crystal composite with optimized electric and electro‐optical properties for devices

Greenly synthesized porous carbon nanoparticle (bio‐waste‐based)‐doped nematic liquid crystal composite with optimized electric and electro‐optical properties for devices

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

Effect of Guest Particles on the Functional Dielectric Properties of Materials for Display Application

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