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利用γ-氨丙基三乙氧基硅烷(KH550)氨基化改性Fe_3O_4纳米粒子,并以其为稳定剂、甲苯为软模板,与苯胺形成Pickering乳液,再以过硫酸铵(APS)为引发剂、HCl为掺杂剂,用界面聚合法合成了掺杂态聚苯胺(PANI)/KH550-Fe_3O_4复合材料。采用FTIR、SEM、XRD对样品形貌和结构进行了表征,通过振动样品磁强计(VSM)考察了不同浓度HCl对复合材料磁性能的影响。结果表明:当c(HCl)=0.1 mol/L时,复合材料的饱和磁强度高达24 841 A/m。用矢量网络分析仪(VNA)对复合材料的屏蔽和吸波性能进行了分析,结果表明:在c(HCl)=0.1 mol/L、复合材料厚度为1 mm、电磁波的频率为10 160 Hz下,复合材料的屏蔽效能高达40.682 dB,在12 400 Hz时反射损耗达-47.043 dB。
Ammoniation of Fe_3O_4 nanoparticles with γ-aminopropyltriethoxysilane (KH550) was used as the stabilizer. Toluene was used as soft template to form Pickering emulsion with aniline. Ammonium persulfate (APS) Agent and HCl as dopants, PANI / KH550-Fe_3O_4 composites were synthesized by interfacial polymerization. The morphology and structure of the samples were characterized by FTIR, SEM and XRD. The effects of different concentrations of HCl on the magnetic properties of the composites were investigated by vibrating sample magnetometer (VSM). The results show that when c (HCl) = 0.1 mol / L, the saturation magnetization of the composites reaches as high as 24 841 A / m. The shielding and absorbing properties of the composites were analyzed by a vector network analyzer (VNA). The results show that with the C (HCl) = 0.1 mol / L, the composite thickness is 1 mm, the frequency of the electromagnetic wave is 10 160 Hz , The shielding effectiveness of the composites is up to 40.682 dB, and the reflection loss is up to -47.043 dB at 12 400 Hz.