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Research on the effect of different surfactants on fluidity of water-based magnetic fluid

机译：不同表面活性剂对水基流动性的影响研究

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In order to expand the range of applications of magnetic fluid, water-based magnetic fluid with different surfactants is synthesized and the property of fluidity has been intensively studied. Three kinds of surfactants (sodium dodecyl sulfate, oleic acid and polyethylene glycol) are used to synthesize three different magnetic fluids with the same magnetic nanoparticles and carrier liquid. Their microstructures and thermal stability of magnetic nanoparticles coated with different surfactants are characterized by transmission electron microscopy and thermogravimetric analysis. Results show that water-based magnetic fluid with sodium dodecyl sulfate agglomerates more obviously while magnetic fluid with polyethylene glycol keeps good dispersion. In addition, magnetic measurements reveal that all these magnetic fluids exhibit typical superparamagnetic behavior and the magnetic fluid using polyethylene glycol as surfactant maintains the specific saturation magnetization of similar to 60 emu g(-1). What is more, shear stress and viscosity of these three magnetic fluids are measured by the rotational rheometer. The shear stress increases with the increasing shear rate while the viscosity decreases with the increasing shear rate. This indicates that water-based magnetic fluid has the property of pseudoplastic fluid. What is more, the viscosity of the magnetic fluid with polyethylene glycol as surfactant is lower than other two magnetic fluids and is prone to reach a steady state at a low shear rate in a short time.
机译：为了扩大磁性流体的应用范围，合成了具有不同表面活性剂的水基磁性流体，并对流动性的性能进行了集中研究。使用三种表面活性剂（十二烷基硫酸钠，油酸和聚乙二醇）用相同的磁性纳米颗粒和载体液合成三种不同的磁性流体。涂覆有不同表面活性剂的磁性纳米颗粒的微观结构和热稳定性的特征在于透射电子显微镜和热重分析。结果表明，水性磁性流体与十二烷基硫酸钠聚集体更明显，而聚乙二醇的磁性流体保持良好的分散。另外，磁性测量表明，所有这些磁性流体都表现出典型的超顺磁性行为和使用聚乙二醇作为表面活性剂的磁性流体维持与60兆克（-1）类似的特定饱和磁化强度。更重要的是，通过旋转流变仪测量这三种磁性流体的剪切应力和粘度。剪切应力随着剪切速率的增加而增加，而粘度随着剪切速率的增加而降低。这表明水基磁性流体具有假塑性液的性质。更重要的是，作为表面活性剂的聚乙二醇的磁性流体的粘度低于其他两个磁性流体，并且在短时间内易于以低剪切速率达到稳态。

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