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.

制备了Fe ₃ O ₄ /聚苯胺 (Fe ₃ O ₄ /PANI) 纳米复合材料，并将其用作填料，用于在铝 (Al) 基材上制备环氧 (EP) 基涂层，用于电磁波吸收应用。Fe ₃ O ₄纳米颗粒通过化学沉淀（1-Fe ₃ O ₄）和水热（2-Fe ₃ O ₄）方法合成，并用作核，然后聚合苯胺作为壳层。XRD、FT-IR和FE-SEM分析证实成功合成了Fe ₃ O ₄纳米粒子，并制备了Fe ₃O ₄ /PANI 核壳纳米复合材料。Fe ₃ O ₄ /PANI纳米复合材料以及石墨(G)粉作为EP基体的填料制备环氧/Fe ₃ O ₄ /聚苯胺/石墨(EP/Fe ₃ O ₄ /PANI/G)复合涂层在铝基板上。EP基复合涂层的电磁波吸收性能通过分析反射损耗(RL)和损耗因子对Fe ₃ O ₄合成方法、Fe ₃ O ₄ /PANI百分比和Al基材上的涂层厚度进行评估。环氧/化学沉淀 Fe ₃的折射率O ₄ /聚苯胺/石墨（EP/1-Fe ₃ O ₄ /PANI/G）和环氧/水热Fe ₃ O ₄ /聚苯胺/石墨（EP/2-Fe ₃ O ₄ /PANI/G）纳米复合涂层在铝上底物进行了测量。对于 EP/1-Fe ₃ O ₄ /PANI/G 和 EP/2-Fe ₃ O ₄ /PANI/G 涂层，分别在 11.2 GHz 和 11 GHz 频率下获得了分别为 -34.28 dB 和 -31.1 dB 的最大 RL 值涂层厚度为2mm。结果表明，同时存在超顺磁性 Fe ₃ O ₄ 纳米粒子以及具有介电性能的PANI链和石墨粉对EP基复合涂层的电磁干扰（EMI）吸收性能实现了协同和互补的效果。