Electrical Treeing and Partial Discharge Characteristics of Epoxy/Silica Nanocomposite under Alternating Current

Figure 5

TEM images for nanosilica particles dispersed in epoxy nanocomposite. (a) Unmodified nanosilica content is 1 phr, and alkyl-modified nanosilica contents are (b) 1 phr, (c) 3 phr, and (d) 7 phr.

(a)

(b)

(c)

(d)