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首页> 外文期刊>RSC Advances >Aligned Fe3O4 magnetic nanoparticle films by magneto-electrospray method
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Aligned Fe3O4 magnetic nanoparticle films by magneto-electrospray method

机译：磁电喷雾法制备Fe 3 O 4 磁性纳米颗粒薄膜

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摘要

This work reports for the first time the preparation and evaluation of aligned Fe3O4 nanoparticle films via a magneto-electrospray method, i.e., electrospray under a magnetic field. The magnetic field was applied to align the magnetic moment of Fe3O4 particles. Well-dispersed Fe3O4 nanoparticles (NPs) with average sizes of 10, 25, and 45 nm were obtained using a bead-mill dispersion. The Fe3O4 nanoparticle slurries were mixed with a polyvinyl alcohol (PVA) solution and then deposited on Si-wafers under a 0.1 T magnetic field. The Fe3O4 crystalline structures were maintained after both dispersion and deposition, as characterized by X-ray diffraction patterns. Hysteresis curves revealed that the magnetic coercivity (Hc) of the well-dispersed nanoparticle slurries decreased owing to magnetic interactions among particles. However, the Hc values of the films were larger than those of the nanoparticle slurries. The values further increased from the application of a magnetic field during film deposition. This enhancement was attributed to alignment of the magnetic moments of the Fe3O4 NPs. These results show that tuning of the magnetic properties of materials, such as Fe3O4 NPs, can be achieved by controlling the alignment of their magnetic moment.
机译：这项工作首次报告了对齐的Fe 3 O 4 纳米颗粒薄膜的制备和评价。通过即的磁电喷雾方法，在磁场下进行电喷雾。施加磁场以对准Fe 3 O 4 粒子的磁矩。均匀分散的Fe 3 O 4 纳米粒子（NP），平均尺寸为10、25和45 nm使用珠磨机分散体获得。将Fe 3 O 4 纳米颗粒浆料与聚乙烯醇（PVA）溶液混合，然后沉积在Si上-晶片在0.1 T磁场下。 X射线衍射表明，Fe 3 O 4 的晶体结构在分散和沉积后均得以保持。模式。磁滞曲线表明，由于颗粒间的磁性相互作用，分散良好的纳米颗粒浆料的矫顽力（ H c ）降低。然而，薄膜的 H c 值大于纳米颗粒浆料。该值由于在膜沉积期间施加磁场而进一步增加。这种增强归因于Fe 3 O 4 NP的磁矩对齐。这些结果表明，Fe 3 O 4 NPs等材料的磁性能调节可以是通过控制其磁矩的对准来实现。

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