Towards an understanding of nanometric dielectrics

Nelson, J. K.; Fothergill, J.C.; Dissado, L.A.; Peasgood, W.

doi:10.1109/ceidp.2002.1048793

Cited by 181 publications

(116 citation statements)

References 9 publications

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“…Nanodielectrics have attracted a great attention since the first experimental data were reported publicly in 2002 [10][11]. The current research is concentrated on the short-term breakdown and the long-term failure of epoxy and other polymer matrix with inorganic nanoparticles added.…”

Section: Introductionmentioning

confidence: 99%

Short-term breakdown and long-term failure in nanodielectrics: a review

Yin

Chen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

299

172

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Nanodielectrics, which are concentrated in polymer matrix incorporating nanofillers, have received considerable attention due to their potential benefits as dielectrics. In this paper, short-term breakdown and long-term failure properties of nanodielectrics have been reviewed. The characteristics of polymer matrix, types of nanoparticle and its content, and waveforms of the applied voltage are fully evaluated. In order to effectively comment on the published experimental data, a ratio k has been proposed to compare the electric properties of the nanodielectrics with the matrix and assess the effect for nanoparticles doping. There is evidence that the short-term breakdown properties of nanodielectrics show a strong dependence on the applied voltage waveforms. The polarity and the cohesive energy density (CED) of polymer matrix have a dramatic influence on the properties of nanodielectrics. Nanoparticle doped composites show a positive effect on the long-term failure properties, such as ageing resistance and partial discharge (PD) properties of nanocomposites are superior than microcomposites and the matrix. The larger the dielectric constant and CED of the matrix become, the more significant improvements in long-term performance appear. Based on the reported experimental results, we also present our understandings and propose some suggestions for further work.

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Section: Introductionmentioning

confidence: 99%

Short-term breakdown and long-term failure in nanodielectrics: a review

Yin

Chen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

299

172

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“…before short circuiting) and arrows show the charge decay with time. Figure 7 and Figure 8 recap the comparison made in [1] between the epoxy composites micro-and nano-filled with TiO 2 . In the nano-filled material, there is homo-charge near the electrodes whereas in the micro-filled there is hetero-charge.…”

Section: Space Charge Measurementmentioning

confidence: 99%

“…The formulation and processing of the planar specimens (having thicknesses between 500 and 750 µm) have been described previously [1]. These are cast under carefully controlled conditions to ensure good mixing, dispersion and the minimization of voids.…”

Section: Specimen Preparationmentioning

confidence: 99%

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Dielectric properties of epoxy nanocomposites containing TiO/sub 2/, Al/sub 2/O/sub 3/ and ZnO fillers

Fothergill

Nelson²,

Fu³

The 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2004. LEOS 2004.

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Abstract: The paper presents results of dielectric spectroscopy and space charge (PEA) measurements on epoxy resin filled with 10% w/w micro-and nano-sized particles of TiO 2 , Al 3 O 2 and ZnO. The results appear to show that the material from which the nano-particle is made is not highly significant in influencing these results. The results support the proposition that the dielectric properties of such nano-filled composites are controlled by Stern-Gouy-Chapman layers ("interaction zones") around the particles. Permanent

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“…Tanaka et al recently proposed a multi-core model to explain the some high electric field phenomena in the nanocomposites [4]. Over the years, several studies on space charge characteristics in nanocomposites have been carried out [5][6][7]. It has been demonstrated that the addition of nanoparticles hinder space charge formation.…”

Section: Introductionmentioning

confidence: 99%

Space charge in LLDPE loaded with nanoparticles

Chen

Zhang

Stevens

2007

2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena

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Fillers are widely used in insulation systems to achieve specific electrical, mechanical and thermal properties. Recently, polymer nanocomposites have attracted significant attention as a means of improving their performance and widening their utility. To better use the nanocomposites, a thorough understanding of interaction between nanoparticles and their matrix is important. The interaction can be studied by various methods. In the present study we focus our attention on space charge dynamics of linear low density polyethylene (LLDPE) loaded with nanometric size aluminium oxide (alumina) under dc electric fields. To obtain a good dispersion of nano fillers in LLDPE, a Brabender mixer has been utilised. Four types of LLDPE nanocomposite films were prepared with concentrations of alumina of 0, 1, 5 and 10 wt% for space charge measurements. They were electrically stressed at three electric field levels of 10, 50 and 100 kV/mm and space charge dynamics during stressing period and decay after the removal of the applied electric field were observed. The results show that space charge dynamics in nanocomposites are dependent on both content of filler and the applied electric field. Generally, the amount of space charge in the sample with 1% of alumina is less while there is a significant change in characteristics in the sample loaded with 5% alumina or more. In particular, the electrical performance in the sample with 10% alumina deteriorates, indicating there is an optimal load of alumina.

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Towards an understanding of nanometric dielectrics

Cited by 181 publications

References 9 publications

Short-term breakdown and long-term failure in nanodielectrics: a review

Short-term breakdown and long-term failure in nanodielectrics: a review

Dielectric properties of epoxy nanocomposites containing TiO/sub 2/, Al/sub 2/O/sub 3/ and ZnO fillers

Space charge in LLDPE loaded with nanoparticles

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