Abstract
Fe3O4/polyaniline (Fe3O4/PANI) nanocomposite was prepared and used as filler in the preparation of Epoxy (EP) based coatings on Aluminum (Al) substrates for electromagnetic wave absorption application. The Fe3O4 nanoparticles were synthesized by chemical precipitation (1-Fe3O4) and hydrothermal (2-Fe3O4) methods and were used as core followed by the polymerization of aniline as shell layer. The XRD, FT-IR and FE-SEM analysis were confirmed the successful synthesis of Fe3O4 nanoparticles, and preparation of Fe3O4/PANI core-shell nanocomposite. Fe3O4/PANI nanocomposite as well as graphite (G) powder were used as filler in EP matrix for the preparation of Epoxy/Fe3O4/polyaniline/graphite (EP/Fe3O4/PANI/G) composite coating on Al substrates. The electromagnetic wave absorption properties of EP based composite coatings was evaluated by the analysis of reflection loss (RL) and loss factors against the Fe3O4 synthesis method, Fe3O4/PANI percentage and coating thickness on Al substrates. The refractive index of Epoxy/chemical precipitation Fe3O4/polyaniline/graphite (EP/1-Fe3O4/PANI/G) and Epoxy/hydrothermal Fe3O4/polyaniline/graphite (EP/2-Fe3O4/PANI/G) nanocomposites coatings on Al substrates was measured. The maximum RL values of respectively −34.28 dB and −31.1 dB at 11.2 GHz and 11 GHz frequencies were obtained for EP/1-Fe3O4/PANI/G and EP/2-Fe3O4/PANI/G coatings respectively with the coating thickness of 2 mm. Results showed that the simultaneous presence of superparamagnetic Fe3O4 nanoparticles as well as PANI chains and graphite powder with dielectric properties achieved synergetic and complementary effects on the electromagnetic interference (EMI) absorption properties of EP based composite coatings.
Published Version
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