n these images, we note in the case of PANI (Fig. 2a), the existence
of lamellar, linear in approximately 1–2 m in size and a
crystalline form in size below 0.5 m, with flat and smooth surfaces,
although the latter is the dominant morphology in the PANI
micrographs, this confirms that the doping agent used gives a
pseudo-metallic characteristic of PANI. In magnetite micrograph,
we observe a crystalline morphology with micro porous structure
which has seldom been reported in the literature. This structure
is correlated with X-ray investigation. In the SEM micrographs of
cured composites films, the white regions are the filler particles. For
low ratios of fillers, the PANI and magnetite particles are homogeneously
and randomly dispersed in the epoxy matrix, indicating
a homogeneous mixture of phases and good compatibility. It is
believed that PANI and Fe3O4 fillers are well dispersed in epoxy
resin composites because of the use of the vigorous stirring procedure
based on magnetic stirring, mechanical and sonication for
long time before curing process. Moreover polyaniline penetrates
in porous regions of magnetite, and makes the contact between
particle fillers. When the fillers, with their electrical conductivity
characteristics are anchored in a support, they form electrical
conduction paths, which favor the Ohmic loss of incident energy.
However, when the weight content of fillers in the samples is above
15 wt.%, agglomerates of fillers are formed in the matrix