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首页> 外文期刊>RSC Advances >New physical insights into the electromagnetic shielding efficiency in PVDF nanocomposites containing multiwall carbon nanotubes and magnetic nanoparticles
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New physical insights into the electromagnetic shielding efficiency in PVDF nanocomposites containing multiwall carbon nanotubes and magnetic nanoparticles

机译：对包含多壁碳纳米管和磁性纳米粒子的PVDF纳米复合材料的电磁屏蔽效率的新物理见解

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This work attempts to bring critical insights into the electromagnetic shielding efficiency in polymeric nanocomposites with respect to the particle size of magnetic nanoparticles added along with or without a conductive inclusion. To gain insight, various Ni-Fe (NixFe1-x; x = 10, 20, 40; Ni: nickel, Fe: iron) alloys were prepared by a vacuum arc melting process and different particle sizes were then achieved by a controlled grinding process for different time scales. Poly(vinylidene fluoride), PVDF based composites involving different particle sizes of the Ni-Fe alloy were prepared with or without multiwall carbon nanotubes (MWNTs) by a wet grinding approach. The Ni-Fe particles were thoroughly characterized with respect to their microstructure and magnetization; and the electromagnetic (EM) shielding efficiency (SE) of the resulting composites was obtained from the scattering parameters using a vector network analyzer in a broad range of frequencies. The saturation magnetization of Ni-Fe nanoparticles and the bulk electrical conductivity of PVDF/Ni-Fe composites scaled with increasing particle size of NiFe. Interestingly, the PVDF/Ni-Fe/MWNT composites showed a different trend where the bulk electrical conductivity and SE scaled with decreasing particle size of the Ni-Fe alloy. A total SE of similar to 35 dB was achieved with 50 wt% of Ni60Fe40 and 3 wt% MWNTs. More interestingly, the PVDF/Ni-Fe composites shielded the EM waves mostly by reflection whereas, the PVDF/Ni-Fe/MWNT shielded mostly by absorption. A minimum reflection loss of similar to 58 dB was achieved in the PVDF/Ni-Fe/MWNT composites in the X-band (8-12 GHz) for a particular size of Ni-Fe alloy nanoparticles. This study brings new insights into the EM shielding efficiency in PVDF/magnetic nanoparticle based composites in the presence and absence of conducting inclusion.
机译：这项工作试图就添加或不添加导电夹杂物的磁性纳米颗粒的粒度，对聚合物纳米复合材料的电磁屏蔽效率带来批判性的见解。为了获得洞察力，通过真空电弧熔化工艺制备了各种镍铁合金（NixFe1-x; x = 10、20、40; Ni：镍，Fe：铁），然后通过控制研磨工艺获得了不同的粒径不同的时间范围。通过湿磨法制备了具有或不具有多壁碳纳米管（MWNT）的，包含不同粒径的Ni-Fe合金的聚偏二氟乙烯PVDF基复合材料。 Ni-Fe颗粒的微观结构和磁化强度得到了彻底表征。并使用矢量网络分析仪在较宽的频率范围内从散射参数获得所得复合材料的电磁（EM）屏蔽效率（SE）。 Ni-Fe纳米粒子的饱和磁化强度和PVDF / Ni-Fe复合材料的整体电导率随NiFe粒径的增加而缩放。有趣的是，PVDF / Ni-Fe / MWNT复合材料表现出不同的趋势，其中整体电导率和SE随着Ni-Fe合金粒径的减小而成比例增加。使用50 wt％的Ni60Fe40和3 wt％的MWNT，获得的总SE近似于35 dB。更有趣的是，PVDF / Ni-Fe复合材料主要通过反射屏蔽EM波，而PVDF / Ni-Fe / MWNT主要通过吸收屏蔽。对于特定尺寸的Ni-Fe合金纳米粒子，在X波段（8-12 GHz）中，PVDF / Ni-Fe / MWNT复合材料的最小反射损耗达到了58 dB。这项研究为有无导电夹杂物的PVDF /磁性纳米颗粒基复合材料的电磁屏蔽效率带来了新的见解。

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