The multiscale approach has been adapted to enhance the electromagnetic interference shielding properties of carbon fiber (CF) veil epoxy-based composites. The Fe 3 O 4 nanoparticles (NPs) were homogeneously dispersed in the epoxy matrix after surface modification by using silane coupling agent. The CF veil/Fe 3 O 4 NPs/epoxy multiscale composites were manufactured by impregnating the CF veils with Fe 3 O 4 NPs/epoxy mixture to prepare prepreg followed by vacuum bagging process. The electromagnetic interference shielding properties combined with the complex permittivity and complex permeability of the composites were investigated in the X-band (8.2–12.4 GHz) range. The total shielding effectiveness (SE T ) increases with increasing Fe 3 O 4 NPs loadings and the maximum SE T is 51.5 dB at low thickness of 1 mm. The incorporation of Fe 3 O 4 NPs into the composites enhances the complex permittivity and complex permeability thus enhancing the electromagnetic wave absorption capability. The increased SE T dominated by absorption loss SE A is attributed to the enhanced magnetic loss and dielectric loss generated by Fe 3 O 4 NPs and multilayer construction of the composites. The microwave conductivity increases and the skin depth decreases with increasing Fe 3 O 4 NPs loadings.
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Chen et al. (2017) studied this question.
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