Structural analysis and dielectric investigations of pure and rare earth elements (Y and Gd) doped NiO nanoparticles

Boukhari, J. Al; Khalaf, A.; Awad, R.

doi:10.1016/j.jallcom.2019.153381

Cited by 54 publications

(26 citation statements)

References 78 publications

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“…Hence, NiO nanoparticles of various size, shape, and different dopants have been synthesized by different methods, and its potential application in numerous fields have been studied [8,[14][15][16][17][18]. Since the rare earth elements possess partially filled 4f orbitals, these elements can be utilized as dopants to modulate NiO nanoparticles [19][20][21][22][23]. The structural, magnetic, optical, and dielectric behaviour of rare earth (Y, Pr, Sm, Gd, and Er) doped NiO nanoparticles were extensively studied by Al Boukhari et al [11,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

Prasad

Veillon

et al. 2021

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

Prasad

Veillon

et al. 2021

Journal of Alloys and Compounds

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“…According to the diffraction angle corresponding to X-ray diffraction peak, the crystal lattice periodic array spacing of inorganic crystals was calculated. Besides, the changes caused by the structural interaction of nanoparticles and polymers was explored [20]. In this experiment, the Nano-ZnO particles and Nano-ZnO/LDPE before and after modification was detected.…”

Section: Xrd Characterization Of Compositesmentioning

confidence: 99%

The Research of Interface Microdomain and Corona-Resistance Characteristics of Micro-Nano-ZnO/LDPE

Cheng

Guang

2020

Polymers

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In this article, the melting blend was used to prepare the Micro-ZnO/LDPE, Nano-ZnO/LDPE and Micro-Nano-ZnO/LDPE with different inorganic particles contents. The effect of Micro-ZnO and Nano-ZnO particles doping on interface microdomain and corona-resistance breakdown characteristics of LDPE composite could be explored. Based on the energy transfer and heat exchange theory of energetic electrons, the inner electrons energy transfer model of different ZnO/LDPE composites was built. Besides, the microstructure and crystalline morphology of inorganic ZnO-particles and polymer composites were detected by SEM, XRD, FTIR, PLM and DSC test, and the AC breakdown and corona-resistance breakdown characteristics of composites could be explored. From the experimental results, the Nano-ZnO particles after surface modification dispersed uniformly in LDPE matrix, and the nanoparticles agglomeration almost disappeared. The inorganic particles doping acted as the heterogeneous nucleation agent, which improved the crystallization rate and crystallinity of polymer composites effectively. The ZnO particles with different size doping constituted the different interface structure and crystalline morphology, which made different influence on composites macroscopic properties. When the Nano-ZnO particle size was 40nm and the mass fraction was 3%, the breakdown field strength of Nano-ZnO/LPDE was the highest and 15.8% higher than which of pure LDPE. At the same time, the shape parameter β of Micro-Nano-composite was the largest. It illustrated the microparticles doping reduced the probability of nanoparticles agglomeration in matrix. Besides, both Micro-ZnO and Micro-Nano-ZnO particles doping could improve the ability of corona corrosion resistance of LDPE in varying degrees. The corona-resistant breakdown time order of four samples was as follows: LDPE < Micro-ZnO/LDPE < Nano-ZnO/LDPE < Micro-Nano-ZnO/LDPE. When the mass fraction of Micro-ZnO and Nano-ZnO particles was 2% and 3% respectively, the corrosion depth and area of Micro-Nano-ZnO/LDPE was the least, and the ability of corona corrosion resistance was the strongest.Polymers 2020, 12, 563 2 of 17 of the power system. Therefore, how to improve the long-term dielectric properties of polythene insulation has become urgent to solve [1][2][3][4]. Research showed that the conventional polymer/inorganic Micro-composites possessed excellent thermal conductivity and thermal blocking effect. Besides, the effect of electrical corrosion resistance was obvious. For the nanoparticles doping, it could improve many electrical properties of polymers such as partial discharge resistance, electrical treeing resistance, corona aging resistance and space charge accumulation restraint [5][6][7]. Therefore, a new composite material combining both of these advantages was our aim to find out.On this account, the Micro-Nano-composite technology was used to regulate and control the interface bonding state between the polymer and inorganic Micro-Nano-particles. Then the mesoscopic morphology of composites wa...

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“…Plastic cables possess some advantages, such as a large transmission capacity, small mass, and long-term operational stability. Thus, these cables are widely used in AC transmission systems [ 9 , 10 , 11 ]. Plastic cables are currently used in DC transmission systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Medium on LDPE Dielectric Properties

2022

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Polyethylene, with its excellent mechanical and dielectric properties is used as an insulator for high-voltage direct current (HVDC) transmission. In ultra-high-voltage direct current (UHVDC) transmission, the ageing of insulation materials caused by space charge under high DC voltage becomes serious. Therefore, restraining the space charge and improving the dielectric properties of HVDC cables is important. In this study, low-density polyethylene (LDPE) was used as the raw material and combined with cooling media in a vulcanizing press. A polarizing microscope was used to observe the samples’ crystal morphologies. The space charge accumulation and dispersion were detected using pulsed electro-acoustic. Additionally, dielectric properties such as electrical conductivity and dielectric frequency spectrum were tested. The grain size in the air-cooled LDPE samples was found to be large and unevenly dispersed. However, the grain sizes in the water and oil cooling LDPE samples were small. The mean charge density of the oil cooling samples was the lowest. Under a short circuit measurement, more space charges were found in the natural and rapid air cooling samples. The mean charge densities of these two samples were high, with a fast decay rate. With an 8 and 50 kV/mm electric field strength, the oil cooling samples’ conductivity was the highest and lowest, respectively.

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Structural analysis and dielectric investigations of pure and rare earth elements (Y and Gd) doped NiO nanoparticles

Cited by 54 publications

References 78 publications

Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

The Research of Interface Microdomain and Corona-Resistance Characteristics of Micro-Nano-ZnO/LDPE

Effect of Cooling Medium on LDPE Dielectric Properties

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