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首页> 外文期刊>Nanotechnology >Preparation and evaluation of magnetic nanocomposite fibers containing alpha ''-Fe16N2 and alpha-Fe nanoparticles in polyvinylpyrrolidone via magneto-electrospinning
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Preparation and evaluation of magnetic nanocomposite fibers containing alpha ''-Fe16N2 and alpha-Fe nanoparticles in polyvinylpyrrolidone via magneto-electrospinning

机译：磁电纺丝法制备和评价聚乙烯吡咯烷酮中含α''-Fe16N2和α-Fe纳米粒子的磁性纳米复合纤维

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摘要

Two kinds of ferromagnetic nanocomposite fiber comprising. alpha"-Fe16N2 and alpha-Fe nanoparticles (NPs), which have the highest magnetic moments as hard and soft magnetic materials, respectively, embedded in polyvinylpyrrolidone (PVP) have been synthesized via the magneto-electrospinning method. Both alpha"-Fe16N2 and alpha-Fe were single-domain core-shell NPs with an average outer diameter of 50 nm and Al2O3 as the shell. Ferrofluid precursors used for the electrospinning were prepared by dispersing these NPs in a PVP-toluene-methanol solution. The results show that applying the magnetic field in the same direction as the electric field resulted in smaller and more uniform fiber diameters. Nanocomposite fibers containing alpha"-Fe16N2 had smaller diameters than those containing alpha-Fe NPs. These magnetic-field effects on the fiber formation were explained by referring to the kinetic energy of the moving jet in the electrospinning process. In addition, magnetic hysteresis curves showed an enhancement of the magnetic coercivity (H-c) and remanence (M-r) by 22.9% and 22.25%, respectively. These results imply a promising possibility of constructing bulk magnetic materials using alpha"-Fe16N2 NPs, which furthermore reveals attractive features for many other magnetic applications, such as magnetic sensors.
机译：包含两种铁磁纳米复合纤维。通过磁电纺丝法合成了分别嵌入聚乙烯吡咯烷酮（PVP）中的硬磁材料和软磁材料分别具有最高磁矩的α“ -Fe16N2和α-Fe纳米粒子。α” -Fe16N2和α-Fe是单畴核-壳NP，平均外径为50 nm，Al2O3为壳。通过将这些NP分散在PVP-甲苯-甲醇溶液中来制备用于电纺丝的铁磁流体前体。结果表明，在与电场相同的方向上施加磁场会导致较小的直径和更均匀的纤维直径。含有α“ -Fe16N2的纳米复合纤维的直径比含有α-FeNPs的纳米纤维小。这些磁场对纤维形成的影响通过静电纺丝过程中移动射流的动能来解释。此外，磁滞曲线结果表明，磁矫顽力（Hc）和剩磁（Mr）分别提高了22.9％和22.25％。这些结果表明，使用α-Fe16N2NPs来构建体磁材料的可能性很大，并且进一步揭示了许多其他材料的诱人特性磁性应用，例如磁性传感器。

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