Thermotropic liquid crystal doped with silica, silica grafted with aniline (ANI@SiO2) and polyaniline (PANI@SiO2)

Salah, M. Ben; Jaoued, N. Grayaa; Soltani, Taoufik; Guesmi, Ahlem; Houas, Ammar; Hamadi, Naoufel Ben; Hbaïeb, Souhaïra

doi:10.1080/02678292.2023.2220293

Cited by 2 publications

(2 citation statements)

References 56 publications

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“…A linear increase at high frequency is followed by a small quasi-constant plateau at low frequency. Additionally, as filler concentration rises, the plateau's shift towards the high-frequency band suggests modifications to the electrical characteristics and ionic behaviour [42]. Generally, this result is matched with the results for the imaginary part of permittivity obtained in section 3.1.…”

Section: Impedancesupporting

confidence: 86%

“…At 3 wt% and 5 wt% of SNPs concentration, the impedance gradually starts to rise, but it continues to be lower than that of the unfilled epoxy. So, it can be concluded that when the concentration of silica filler is less than 5 wt%, there is an increase in space charges as explained earlier, which decreases the impedance value, signifying an increase in conductivity [42]. Whereas, when increasing the filler concentration between 10 wt% and 15 wt%, an increase in the resistivity value due to the formation of immobilized nanolayers that limit charge polarization, as detailed previously.…”

Section: Impedancementioning

confidence: 52%

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Electrical characteristics of different concentration of silica nanoparticles embedded in epoxy resin

Al Soud,

Daradkeh,

Knápek

et al. 2023

Phys. Scr.

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To improve the electrical and mechanical properties of epoxy resin for their wide scope of applications, a modified epoxy nanocomposite was produced in this study by incorporating SiO2 nanoparticles of 15-30 nm in size.The electric properties of epoxy nanocomposite at room temperature at a frequency range of 10-2 – 107 Hz were examined. To determine the impact of nanoparticles on the epoxy composition, the epoxy composite was evaluated by scanning electron microscopy- energy dispersive X-ray spectroscopy, fourier transform infrared spectra, and raman spectra . The epoxy with 15 wt.% of SiO2 nanoparticles samples had a lower permittivity, loss number, conductivity, and capacitance than the unfilled epoxy. While it has a higher impedance and modulus than the unfilled epoxy. Accordingly, the effect of immobilized layers and the effect of the Lichtenecker-Rothe logarithmic mixing rule on the electrical and mechanical properties were clarified.

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Section: Impedancesupporting

confidence: 86%

Section: Impedancementioning

confidence: 52%

Electrical characteristics of different concentration of silica nanoparticles embedded in epoxy resin

Al Soud,

Daradkeh,

Knápek

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

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New Series of Hydrogen-Bonded Liquid Crystal with High Birefringence and Conductivity

Ben Salah,

Saadaoui,

Soltani

et al. 2024

Molecules

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Liquid crystals with high dielectric anisotropy, low operational thresholds, and significant birefringence (Δn) represent a key focus in soft matter research. This work introduces a novel series of hydrogen-bonded liquid crystals (HBLCs) derived from 4-n-alkoxybenzoic, 4-alkoxy-3-fluorobenzoic derivatives (nOBAF), 4-alkoxy-2,3-fluorobenzoic derivatives (nOBAFF), and 2-fluoro-4-nitrobenzoic acid. The HBLCs were characterized using Fourier transform infrared spectroscopy, and their thermal behavior was evaluated via differential scanning calorimetry. Optical observations were conducted using polarized optical microscopy. The results indicate that mixtures containing benzoic acid with a bilateral fluorine substituent exhibit both SmA and SmC phases, while those with a unilateral fluorine substituent exhibit nematic and SmA phases. Moreover, an increase in the length of the alkoxy chain results in an expanded mesophase temperature range. This study demonstrates that the presence of a fluorine substituent and the incorporation of an NO2 group in the molecular structure result in an increase in dielectric permittivity, DC conductivity, dielectric anisotropy, and birefringence.

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Thermotropic liquid crystal doped with silica, silica grafted with aniline (ANI@SiO2) and polyaniline (PANI@SiO2)

Cited by 2 publications

References 56 publications

Electrical characteristics of different concentration of silica nanoparticles embedded in epoxy resin

Electrical characteristics of different concentration of silica nanoparticles embedded in epoxy resin

New Series of Hydrogen-Bonded Liquid Crystal with High Birefringence and Conductivity

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