Effect of neutron irradiation on the impedance of Epoxy-TiO2 nanocomposite for electric power insulation

Abdelmalik, A. A.; Abubakar, Y.M.; Ogbodo, M.O.; Koledov, Victor; Goje, H.G.

doi:10.1016/j.radphyschem.2020.109215

Cited by 5 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…42 Abdelmalik's study reported that the impedance of neutronirradiated epoxy TiO₂ samples ranged from 1 Â 10 5 to 2.5 Â 10 5 ohms. 17 In contrast, the impedance in our current work varied significantly higher, from 80 Â 10 6 to 123 Â 10 6 ohms. This indicates that our PVA/GO-Ag/GA NCs exhibit much higher impedance under neutron irradiation compared with epoxy TiO₂.…”

Section: Dielectric Studiescontrasting

confidence: 70%

“…All samples exhibited increased impedance upon neutron irradiation, with the magnitude of Z′ increasing at lower frequencies. This is attributed to free radicals generated during irradiation might have reacted with NPs, modifying dipolar groups and reducing mobile charge carriers in the polymer matrix, contributing to the observed increase in impedance 17 . However this is dose‐dependent, at higher doses (S4), the fragmentation of the polymer chain leads to the free movement of nanofillers, and also increased space charge accumulation may have reduced the reaction of free radicals with NPs, thereby increasing the mobile charge carriers and subsequently reducing the impedance.…”

Section: Results and Analysismentioning

confidence: 99%

“…This is attributed to free radicals generated during irradiation might have reacted with NPs, modifying dipolar groups and reducing mobile charge carriers in the polymer matrix, contributing to the observed increase in impedance. 17 However this is dose-dependent, at higher doses (S4), the fragmentation of the polymer chain leads to the free movement of nanofillers, and also increased space charge accumulation may have reduced the reaction of free radicals with NPs, thereby increasing the mobile charge carriers and subsequently reducing the impedance. However, with a further increase in fluence (4.19 Â 10 10 n/cm À2 ), Z 0 increased, indicating decreased degradation likely due to cross-linking, which hinders the mobility of charge carriers and consequently increases the impedance.…”

Section: Impedance Analysismentioning

confidence: 99%

“…For example, Abdelmalik et al suggested that adding 1 wt% TiO 2 nanoparticles (NPs) to an epoxy polymer can enhance its dielectric and polarization relaxation behavior, thereby improving resistance to radiation-induced degradation in nuclear environments. 17 Additionally, Abdelmalik highlighted that lower dielectric loss was observed in NC systems with 2 wt% NP loading, possibly due to hindrances in charge transport through various chains and interfaces. 18 Upon neutron exposure, Shilpa et al found that the ionic conductivity significantly increased for Ag-incorporated polyvinyl alcohol (PVA)-NaBr.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

Kavitha,

Eshwarappa,

Shilpa

et al. 2024

Polymers for Advanced Techs

View full text Add to dashboard Cite

Herein we report the method to tailor the band gap and UV absorption of polyvinyl alcohol (PVA)/graphene oxide (GO)‐silver (Ag)/glutaraldehyde (GA) hybrid polymer nanocomposites. The modifications brought by neutron irradiation to the optical and dielectric characteristics enabled the band gap and UV absorption‐tailored polymer nanocomposites to be obtained. Neutron‐irradiated samples, compared with their unirradiated counterparts, exhibit a reduction in transmittance to 78%, rendering them opaque to UV–visible light after irradiation. The energy band gap decreases from 5.25 to 4.09 eV upon irradiation. Furthermore, upon neutron‐irradiation the relaxation time increases from 7.63 × 10−4 to 0.02 s which is evident by the shift in electric modulus imaginary part (M") peak to a lower frequency region, indicating an increase in relaxation time. The Cole–Cole plot for irradiated samples demonstrates lower fitting parameter (α) values of the modified Havriliak–Negami function, indicating a departure from pure capacitor‐like behavior. The neutron irradiation leads to a decrease in conductivity from 44.6 × 10−7 to 0.09 × 10−7 S/cm.

show abstract

Section: Dielectric Studiescontrasting

confidence: 70%

Section: Results and Analysismentioning

confidence: 99%

Section: Impedance Analysismentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

Kavitha,

Eshwarappa,

Shilpa

et al. 2024

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…A meaningful consequence on the impedance of epoxy/TiO 2 nanocomposites destined to electrical power insulation is efficiently correlated with the photoelectrical behavior of titania. The noticeable increase in the impedance value is obtained when the filler is added in the concentration of 3% [149]. If a comparison between the stability effects brought about by TiO 2 and SiO 2 nanocomposites in γ-irradiated epoxy resin is performed after the chemiluminescence measurements [150], the most efficient effect is found when the nanocomposites include titania (Table 6).…”

Section: Elastomersmentioning

confidence: 99%

Irradiation Effects in Polymer Composites for Their Conversion into Hybrids

Zaharescu

Mariș

2022

J. Compos. Sci.

View full text Add to dashboard Cite

In this paper several aspects of profound modifications caused by high energy exposures are presented as possible candidates for the efficient adjusting processing of polymer materials. The class of hybrid composites receives special attention due to the large spectrum of formulations, where the interphase interaction decisively influences the material properties. They represent potential start points for the intimate uniformity of hybrid morphologies. Their radiation processing turns composites onto hybrid morphology with expected features, because the transferred energy is spent for the modification of components and for their compatibility. The essential changes achieved in radiation processed composites explain the new material behavior and durability based on the peculiar restructuring of polymer molecules that occurred in the polymer phase. During high energy irradiation, the interaction between intermediates born in the constitutive phases may convert the primary composites into hybrids, integrating them into large applicability spheres. During the radiation exposure, the resulting hybrids gain a continuous dispersion by means of new chemical bonds. This type of compounds achieves some specific structural modifications in the polymer phase, becoming stable hybrid composites. The functional properties of hybrids definitely influence the material behavior due to the molecular changes based on the structural reasons. The radiolysis of the vulnerable component becomes an appropriate opportunity for the creation of new material with improved stability. The radiation treatment is a proper conversion procedure by which common mixtures may become continuously reorganized. This review presents several examples for the radiation modifications induced by radiation exposure that allow the compatibilization and binding of components as well as the creation of new structures with improved properties. This approach provides the reference patterns for the extension of radiation processing over the well-conducted adjustments of polymer composites, when certain material features are compulsorily required. From this review, several solutions for the adjustment of regular polymer composites into hybrid systems may become conceivable by the extended radiation processing.

show abstract

Effects of neutron irradiation at different fluencies on nanosized anatase titanium dioxide

Mirzayev

Slavov

Donkov

et al. 2022

Radiation Physics and Chemistry

View full text Add to dashboard Cite

Effect of neutron irradiation on the impedance of Epoxy-TiO2 nanocomposite for electric power insulation

Cited by 5 publications

References 11 publications

Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection

Irradiation Effects in Polymer Composites for Their Conversion into Hybrids

Effects of neutron irradiation at different fluencies on nanosized anatase titanium dioxide

Contact Info

Product

Resources

About