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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Ni Nano-Magnetic Fluid Prepared by Submerged Arc Nano Synthesis System (SANSS)
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Ni Nano-Magnetic Fluid Prepared by Submerged Arc Nano Synthesis System (SANSS)

机译：埋弧纳米合成系统制备的镍纳米磁流体

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摘要

This study attempts to prepare Ni nano-magnetic fluid using the developed submerged arc nanoparticle synthesis system (SANSS). Using optimized process parameters, Ni nanoparticles having average diameter of 10 nm were be fabricated, and these Ni nanopar-ticles prepared by the SANSS has strong magnetic features. When the surfactant PVP-K30 is added to the prepared nanofluid, molecules of the surfactant adhere to the surface of the nanoparticles, enabling the nanoparticles to remain in steady suspension and good dispersion. The nanofluid thus obtained was magnetic and had good flow property. In contrast, Ni particles in nanofluid without surfactant added cannot maintain good dispersion and there is no interdependent motion between the particles and the fluid. Traditional magnetic fluids containing non-nanoscaled particles are non-Newtonian fluids with viscosity higher than that of pure fluids without particles, whereas magnetic fluids with well dispersed nanoparticles more closely resemble Newtonian fluids. The Ni nanoparticles fabricated by the SANSS has no residual magnetization or coercive force, thus showing superparamagnetism. Under the magnetic field effect, Ni nanoparticles will move in the direction of the magnetic field. Nanoparticles can resume steady suspension in the carrying liquid when the magnetic field is removed.
机译：本研究试图使用发达的埋弧纳米颗粒合成系统（SANSS）制备Ni纳米磁性流体。使用优化的工艺参数，可以制备平均直径为10 nm的Ni纳米粒子，并且这些由SANSS制备的Ni纳米粒子具有很强的磁性。当将表面活性剂PVP-K30添加到制备的纳米流体中时，表面活性剂的分子粘附至纳米颗粒的表面，使纳米颗粒保持稳定的悬浮液和良好的分散性。如此获得的纳米流体是磁性的并且具有良好的流动性。相反，未添加表面活性剂的纳米流体中的Ni颗粒无法保持良好的分散性，并且颗粒与流体之间没有相互依赖的运动。包含非纳米级颗粒的传统磁流体是非牛顿流体，其粘度高于没有颗粒的纯流体，而具有良好分散的纳米颗粒的磁流体更类似于牛顿流体。由SANSS制备的Ni纳米粒子没有残留的磁化强度或矫顽力，因此显示出超顺磁性。在磁场作用下，Ni纳米粒子将沿磁场方向移动。当去除磁场时，纳米粒子可以在载液中恢复稳定的悬浮。

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