To study the overall rheological characteristics of the silicone oil-based ferrofluid, a chemical co-precipitation method was adopted for preparation, and transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) were used for characterization. The average size of Fe₃O₄ magnetic particles was 10.4 nm and the saturation magnetization of the ferrofluid was 5.98 emu/g. Then, the fluidity, magnetoviscous effect and viscoelasticity of the ferrofluid were studied using a rotational rheometer. The results showed obvious shear thinning of the silicone oil-based ferrofluid under an external magnetic field, and the yield stress of the ferrofluid could not be accurately obtained by fitting the flow curve with an H–B model at a continuous shear rate. A strong magnetoviscous effect could be observed at different shear rates and temperatures. The magnetoviscous parameter R increased with the increase of temperature and its variation decreased with the increase of shear rate. Moreover, based on the magnetic particle chain model and the viscosity–temperature characteristics of the base carrier liquid, different mechanisms of temperature influence on the magnetoviscous effect were analyzed. Finally, a discussion of the microstructure evolution mechanism of the ferrofluid in the modulus changing with frequency was presented through the viscoelastic analysis of the silicone oil-based ferrofluid.

为了研究硅油基铁磁流体的整体流变特性，采用化学共沉淀方法制备，并使用透射电子显微镜（TEM）和振动样品磁力计（VSM）进行表征。_{Fe 3} O ₄平均粒径磁性颗粒为10.4 nm，铁磁流体的饱和磁化强度为5.98 emu/g。然后，利用旋转流变仪研究了铁磁流体的流动性、磁粘效应和粘弹性。结果表明，硅油基铁磁流体在外磁场作用下发生了明显的剪切稀化，并且在连续剪切速率下用H-B模型拟合流动曲线无法准确获得铁磁流体的屈服应力。在不同的剪切速率和温度下可以观察到强的磁粘效应。磁粘性参数R随温度的升高而增大，随剪切速率的增大而减小。此外，基于磁性颗粒链模型和基础载液的粘温特性，分析了温度对磁粘效应影响的不同机制。最后，通过对硅油基铁磁流体的粘弹性分析，讨论了铁磁流体模量随频率变化的微观结构演变机制。