Internal charge behaviour of nanocomposites

By J. K. Nelson, J. Fothergill. 2004

493 citations recorded by the source corpus.

The incorporation of 23 nm titanium dioxide nanoparticles into an epoxy matrix to form a nanocomposite structure is described. It is shown that the use of nanometric particles results in a substantial change in the behaviour of the composite, which can be traced to the mitigation of internal charge when a comparison is made with conventional TiO2 fillers. A variety of diagnostic techniques (including dielectric spectroscopy, electroluminescence, thermally stimulated current and photoluminescence) have been used to augment pulsed electro-acoustic space charge measurement to provide a basis for understanding the underlying physics of the phenomenon. It would appear that, when the size of the inclusions becomes small enough, they act cooperatively with the host structure and cease to exhibit interfacial properties, leading to Maxwell–Wagner polarization. It is postulated that the particles are surrounded by high charge concentrations in the Gouy–Chapman–Stern layer. Since nanoparticles have very high specific areas, these regions allow limited charge percolation through nano-filled dielectrics. The practical consequences of this have also been explored in terms of the electric strength exhibited. It would appear that there was a window in which real advantages accrue from the nano-formulated material. An optimum loading of about 10% (by weight) is indicated.

Subfields: Biomedical Engineering, Materials Chemistry, Pollution

View Paper: https://www.semanticscholar.org/paper/1b34294c9f4d02c3e4838348c88afd05dbcfbbaa

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Biomedical Engineering

1. Shengtao Li
2. Linda Schadler
3. Jun Hu
4. M. Roy
5. J. K. Nelson
6. J. K. Nelson
7. Chengrong Li
8. Y. Hu

In Materials Chemistry

1. Shengtao Li
2. Linda Schadler
3. Jun Hu
4. J. K. Nelson
5. J. K. Nelson
6. Chengrong Li
7. Y. Hu
8. Yao Zhou

In Pollution

1. Linda Schadler
2. J. K. Nelson
3. J. K. Nelson
4. Y. Hu

Citations in the corpus

• A new potential barrier model in epoxy resin nanodielectrics (2011, result): “The latter was proposed by Nelson [24].”
• Polymeric insulation materials for HVDC cables: Development, challenges and future perspective (2017, background): “Considerable works on space charge phenomena in HVDC cable insulation materials have been done in the past, including the space charge formation, effect of temperature and temperature gradient, effect of different conductorinsulation interfaces [42-46] and the ways to suppress space charge accumulat”
• A review on the importance of nanocomposite processing to enhance electrical insulation (2011, background): “Nanoparticles have been shown to provide dramatic changes in space charge behavior, charge trapping and permittivity in polymer matrices [1].”
• Short-term breakdown and long-term failure in nanodielectrics: a review (2010, unknown): “The thickness of specimens was ranging from 50 to 500 μm; ▼ from [57-62]).”
• Electrical properties of epoxy resin based nano-composites (2007, background): “Similar observations have previously been reported in the literature (Nelson and Fothergill 2004, Fragiadakis et al 2005).”
• Effect of semiconductive nanoparticles on insulating performances of transformer oil (2012, background): “The rapid charge dissipation in SNF could be attributed to high shallow trap density created by TiO2 nanoparticles [18], and associated with charge hopping transport process in the shallow traps.”