Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

Farea, M. O.; Abdelghany, A.M.; Oraby, A.H.

doi:10.1039/d0ra07601e

Cited by 138 publications

(48 citation statements)

References 37 publications

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“…The ε ′ value appears to decrease as the frequency rises. The increase in dielectric constant in the low‐frequency range is due to interfacial polarization 33 . As the frequency rises, the dipoles lose their orientational polarization because they do not follow the field.…”

Section: Resultsmentioning

confidence: 99%

“…The increase in dielectric constant in the low-frequency range is due to interfacial polarization. 33 As the frequency rises, the dipoles lose their orientational polarization because they do not follow the field. As seen in Figure 7A, the value of ε 0 becomes constant as the frequency increases due to space charge or interfacial polarization.…”

Section: Dielectric Analysismentioning

confidence: 99%

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Enhancing the structural, thermal, and dielectric properties of the polymer nanocomposites based on polymer blend and barium titanate nanoparticles for application in energy storage

Atta

Algethami

Farea

et al. 2022

Intl J of Energy Research

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Summary Solution casting and ultrasonic‐assisted solution‐cast methods were used to create polymer nanocomposites films based on polyvinyl alcohol (PVA)/polyvinyl pyrrolidone (PVP) filled with varying concentrations of BaTiO3 nanoparticles. The X‐ray diffraction (XRD), Fourier‐transform infrared (FT‐IR), transmission electron microscope, and differential scanning calorimetry (DSC) were used to study the properties of the produced polymer nanocomposite samples. The properties of PVA/PVP‐BaTiO3 nanocomposites, such as ac conductivity, dielectric constant, and dielectric loss, were investigated as a function of BaTiO3 concentration. XRD measurements demonstrate that the pure polymer blend is semi‐crystalline and that the crystallinity degree (Xc) of the doped PVA/PVP mix films is lower than that of the pure blend. Significant variations in the FT‐IR spectra demonstrate the interaction between the BaTiO3 ions and the PVA/PVP matrix. The DSC analysis demonstrates that the PVA/PVP has a single glass transition temperature (Tg), showing that the two polymers are miscible. In addition, when the amount of BaTiO3 NP's increased, the Tg of the nanocomposite films decreased. The AC conductivity spectra of all samples obey Jonscher's power law. For a better understanding of charge storage characteristics and conductivity relaxation, dielectric constant and loss investigations have been carried out. The PVA/PVP mixed with 1.5 wt% BaTiO3 nanofiller achieves a maximum ionic conductivity of ~8.57 × 10−5 S/cm. In this investigation, which introduced a novel approach, the complex permittivity revealed that the real part value of the dielectric constant (ε′) for all samples was much bigger than the imaginary part (ε″) value. These results are predicted to have a significant influence on a variety of applications, including polymer organic semiconductors, energy storage, polymer solar cells, and nanoelectronics.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Analysismentioning

confidence: 99%

Enhancing the structural, thermal, and dielectric properties of the polymer nanocomposites based on polymer blend and barium titanate nanoparticles for application in energy storage

Atta

Algethami

Farea

et al. 2022

Intl J of Energy Research

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“…The wide range of frequencies allows investigations of various relaxation processes concurrently. The small changes in the dielectric properties of polymer as a response to the application of a frequency-dependent electric field can be measured with high accuracy [ 11 , 12 , 13 , 14 ]. Dielectric properties of hybrid PMMA/RGO/Fe 2 O 3 nanocomposites fabricated by in situ polymerization increased the dielectric constant of PMMA [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of Charge Transfer Complex on the Dielectric Relaxation Processes in Poly(methyl methacrylate) Polymer

et al. 2022

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The impact of the charge transfer complex on the dielectric relaxation processes in free poly(methyl methacrylate) (PMMA) polymer sheets was investigated. The frequency dependence of dielectric properties was obtained over the frequency range 0.1 Hz–1 MHz at temperatures ranging between 303 K and 373 K for perylene dye and acceptors (picric acid (PA) and chloranilic acid (CLA)) in an in situ PMMA polymer. The TG/dTG technique was used to investigate the thermal degradation of the synthesized polymeric sheets. Additionally, the kinetic parameters have been assessed using the Coats–Redfern relation. The dielectric relaxation spectroscopy of the synthesized polymeric sheets was analyzed in terms of complex dielectric constant, dielectric loss, electrical modulus, electrical conductivity, and Cole–Cole impedance spectroscopy. α- and β-relaxation processes were detected and discussed. The σ(ω) dispersion curves of the synthesized polymeric sheets show two distinct regions with increasing frequency. The impedance data of the synthesized polymeric sheets can be represented by the equivalent circuit (parallel RC).

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“…6 Therefore, the applications of PGA can be expanded to the elds of high barrier material, biodegradable packing and so on. [7][8][9][10] While, similar to PLA, PGA still has some defects such as poor toughness and thermal stability, which restrict its applications to a great extent. Hence, the toughness modication of PGA is crucial.…”

Section: Introductionmentioning

confidence: 99%

Morphological and mechanical properties of biodegradable poly(glycolic acid)/poly(butylene adipate-co-terephthalate) blends with in situ compatibilization

et al. 2021

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Optical and dielectric characteristics of polyethylene oxide/sodium alginate-modified gold nanocomposites

Abstract: Films of polyethylene oxide and sodium alginate polymer blend (50/50 wt%) embedded with different quantities of Au nanoparticles with size 3–32 nm were made using the casting process.

Cited by 138 publications

References 37 publications

Enhancing the structural, thermal, and dielectric properties of the polymer nanocomposites based on polymer blend and barium titanate nanoparticles for application in energy storage

Enhancing the structural, thermal, and dielectric properties of the polymer nanocomposites based on polymer blend and barium titanate nanoparticles for application in energy storage

Impact of Charge Transfer Complex on the Dielectric Relaxation Processes in Poly(methyl methacrylate) Polymer

Morphological and mechanical properties of biodegradable poly(glycolic acid)/poly(butylene adipate-co-terephthalate) blends with in situ compatibilization

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