The incorporation of 90 nm alumina particles into an epoxy matrix to form a composite microstructure is describedin present study. It is shown that the use of ultrafine particles results in a substantial change in the behavior of thecomposite, which can be traced to the mitigation of internal charges when a comparison is made with conventionalAl2O3 fillers. A variety of diagnostic techniques have been used to augment pulsed electro-acoustic space chargemeasurement 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 toexhibit interfacial properties. It is postulated that the Al2O3 particles are surrounded by high charge concentrations.Since Al2O3 particles have very high specific areas, these regions allow limited charge percolation through Al2O3 filleddielectrics. The practical consequences of this have also been explored in terms of the electric strength exhibited. Itwould appear that there was a window in which real advantages accumulated from the nano-formulated material. Anoptimum filler loading of about 0.5 wt.% was indicated
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