Influence of neutron irradiation on the mechanical and dielectric properties of epoxy/ titanium oxide nanocomposite

Abdelmalik, A. A.; Ogbodo, M.O.; Abubakar, Y.M.; Galadima, Abdulsalam Ismaila; Aliyu, AA; Jonah, S.A.

doi:10.1016/j.radphyschem.2022.110230

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…Abdelmalik et. al's 18 another work reports that the dielectric constant of epoxy TiO₂ ranged from 7 to 14, while in our present work, the dielectric constant ranges from 10 to 15. Furthermore, the tangent loss for epoxy TiO₂ was reported to be between 0.5 and 0.7, whereas our study shows a tangent loss ranging from 0.9 to 2.5.…”

Section: Results and Analysiscontrasting

confidence: 51%

“…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 19 .…”

Section: Introductionmentioning

confidence: 99%

“…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. 19 Yang et al emphasized the importance of regional carrier migration and dipole polarization in the polarization process of epoxy resin NCs, suggesting that these factors play a dominant role in enhancing the material's properties.…”

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confidence: 99%

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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

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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.

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Section: Results and Analysiscontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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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

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“…Another form of titanium dioxide anastase is rare enough; however, it has great electrical conductivity even at room temperature [ 20 ]. Titanium dioxide nanoparticles are a popular filler in various composites [ 22 , 23 , 24 , 25 ]. It was demonstrated that these nanoparticles can substantially improve the mechanical properties of epoxy resin composites [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Titanium dioxide nanoparticles are a popular filler in various composites [ 22 , 23 , 24 , 25 ]. It was demonstrated that these nanoparticles can substantially improve the mechanical properties of epoxy resin composites [ 22 , 23 ]. However, few studies have been published on the dielectric and ultrasonic properties of titanium dioxide-filled silicone composites.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Ultrasonic Properties of PDMS/TiO2 Nanocomposites

Vanskeviče,

Kinka,

Banys

et al. 2024

Polymers

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This work presents the dielectric and ultrasonic properties of polydimethylsiloxane (PDMS) nanocomposites filled with titanium dioxide nanoparticles. The dielectric study was performed over a very broad range of frequencies (20 Hz–3 THz). The dielectric permittivity was almost frequency-independent in all the composites at room temperature over the whole range of measurement frequencies, and the dielectric losses were very low under these conditions (less than 2). The dielectric permittivity strongly increases with the nanoparticle concentration according to the Maxwell–Garnet model. Therefore, the investigated composites are suitable for various flexible electronic applications, particularly in the microwave and terahertz frequency ranges. Dielectric dispersion and increased attenuation of ultrasonic waves were observed at lower temperatures (below 280 K) due to the relaxation of polymer molecules at the PDMS/TiO2 interface and in the polymer matrix. The relaxation time followed the Vogel–Vulcher law, while the freezing temperature increased with the titanium dioxide concentration due to interactions between the polymer molecules and nanoparticles. The significant hysteresis in the ultrasonic properties indicated that titanium dioxide acts as a crystallization center. This is confirmed by the correlation between the hysteresis in the ultrasonic properties and the structure of the composites. The small difference in the activation energy values obtained from the ultrasonic and dielectric investigations is related to the fact that the dielectric dispersion is slightly broader than the Debye-type dielectric dispersion.

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Effect of magnesium content on dielectric properties and corona resistance of Si‐B‐Mg/epoxy resin composites

Wang,

Chen,

Zhao

et al. 2024

Polymer Composites

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To improve the dielectric properties and corona resistance of epoxy resins (EPs), the authors designed and synthesized Si‐B‐Mg/EP nanocomposites and investigated the effects of varying the magnesium elemental content on the dielectric properties, breakdown field strength, corona resistance life, volume resistivity and conductive current of Si‐B‐Mg/EP nanocomposites. The experimental results show that when the molar ratio of Si, B, and Mg in the Si‐B‐Mg composite oxide is 18:2:0.125, the composite has the minor dielectric loss and the most extensive corona resistance life of 401.8 min, which is 4.6 times that of the pure EPs. From the experimental results, the introduction of magnesium can effectively improve the dielectric loss and corona resistance of Si‐B‐Mg/EP composites.Highlights Si‐B‐Mg composite oxides were designed and synthesized. Performance analysis of Si‐B‐Mg/EP composites with different magnesium content The introduction of magnesium reduces the dielectric loss of composites. The introduction of magnesium improves the corona resistance life of composites. Si‐B‐Mg/EP composites with both low dielectric loss and high corona resistance.

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Influence of neutron irradiation on the mechanical and dielectric properties of epoxy/ titanium oxide nanocomposite

Cited by 5 publications

References 23 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

Dielectric and Ultrasonic Properties of PDMS/TiO2 Nanocomposites

Effect of magnesium content on dielectric properties and corona resistance of Si‐B‐Mg/epoxy resin composites

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