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Fabrication and Electromagnetic Properties of Fe Nanofibers Composites

机译:铁纳米纤维复合材料的制备及电磁性能

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In order to develop electromagnetic (EM) wave absorbing materials in the giga-hertz (GHz) frequency range, Fe nanofibers have been prepared by multi-nozzle electrospinning process (ESP) and heat treatments. The effects of applied voltage and feed rate on the morphology of electrospun PVP/Fe salt nanofibers have been studied in the electrospinning process. The average diameter and the standard deviation of electrospun nanofibers tend to decrease with the increase of the applied voltage and the decrease of the feed rate, respectively. Through the heat treatments of calcination and H_2 reduction, as-spun PVP/Fe salt has been stepwise transformed into Fe_2O_3, Fe_3O_4, and Fe phases. To evaluate the EM characteristic of the prepared Fe nanofibers, epoxy matrix composites containing Fe nanofibers of 10 and 30 wt% have been fabricated. The Fe nanofibers have improved the EM characteristics of composites as compared to those of nano-sized metallic particles.
机译:为了开发千兆赫(GHz)频率范围内的电磁(EM)吸波材料,已经通过多喷嘴静电纺丝工艺(ESP)和热处理制备了Fe纳米纤维。在电纺过程中研究了施加电压和进料速率对电纺PVP / Fe盐纳米纤维形态的影响。静电纺丝纳米纤维的平均直径和标准偏差往往随施加电压的增加和进料速度的降低而减小。通过煅烧和还原H_2的热处理,初生PVP / Fe盐已逐步转变为Fe_2O_3,Fe_3O_4和Fe相。为了评估所制备的Fe纳米纤维的EM特性,已经制备了包含10wt%和30wt%的Fe纳米纤维的环氧基质复合材料。与纳米级金属颗粒相比,铁纳米纤维改善了复合材料的电磁特性。

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