Research on the rheological properties of a silicone oil-based ferrofluid

IF 2.2 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2023-08-21 DOI:10.1007/s13367-023-00065-y

Jiajia Zhang, Hongchao Cui, Shida Han, Zhenkun Li, Jingjing Lu

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Abstract

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.

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硅油基铁磁流体流变特性研究

为了研究硅油基铁磁流体的整体流变特性，采用化学共沉淀法制备硅油基铁磁流体，并利用透射电镜(TEM)和振动样品磁强计(VSM)对其进行表征。Fe3O4磁性颗粒的平均尺寸为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、磁粘性效应和粘弹性。结果表明:在外加磁场作用下硅油基铁磁流体发生了明显的剪切变薄，在连续剪切速率下，用H-B模型拟合流动曲线无法准确得到铁磁流体的屈服应力。在不同的剪切速率和温度下，可以观察到较强的磁粘性效应。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，基于磁颗粒链模型和基载液的粘温特性，分析了温度对磁粘效应的不同影响机制。最后，通过对硅油基铁磁流体的粘弹性分析，探讨了模量随频率变化的铁磁流体微观结构演化机理。

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来源期刊

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.