To analyze the effect of magnetite Fe3O4 disk-shaped nanoparticles with flake-shaped microparticles in water-based magneto rheological (MR) suspension, the rheological properties were studied using a parallel plate rheometer. The morphology, crystallinity, and magnetic property of the prepared MR suspensions were examined by field emission scanning electron microscopy (FESEM), X-ray diffraction, and vibrating sample magnetometer, respectively. In the presence of a magnetic field, micron-sized carbonyl iron (CI) particles lead to form a robust columnar structure with Fe3O4 nanoparticles and enhanced the magnetorheological performances. The magnetorheological performances of MR suspensions were examined in shear rate, shear strain, and shear stress testing sweep modes with and without a magnetic field. It was observed that adding the 1 wt% of Fe3O4, the magnetorheological performance of MR suspension enhanced. The MR fluid with CI/Fe3O4 nanoparticle mixture showed significantly higher shear viscosity and shear stress and yielded stresses than pure CI-based MR fluid. The yield stresses were higher in the shear rate sweep mode than strain and stress sweep testing modes.

中文翻译：

---

Fe钪僌钪纳米粒子对片状羰基铁水基悬浮液磁流变性能的影响


为了分析磁铁矿 Fe3O4 盘状纳米颗粒与片状微粒在水基磁流变 (MR) 悬浮液中的影响，使用平行板流变仪研究了其流变特性。分别通过场发射扫描电子显微镜（FESEM）、X射线衍射和振动样品磁力计检查了所制备的MR悬浮液的形貌、结晶度和磁性能。在磁场存在下，微米级的羰基铁 (CI) 颗粒与 Fe3O4 纳米颗粒形成坚固的柱状结构，增强了磁流变性能。在有和没有磁场的剪切速率、剪切应变和剪切应力测试扫描模式下检查了磁流变悬浮液的磁流变性能。结果表明，添加 1 wt% 的 Fe3O4 后，磁流变悬浮液的磁流变性能得到增强。与纯 CI 基 MR 流体相比，含有 CI/Fe3O4 纳米粒子混合物的 MR 流体表现出显着更高的剪切粘度、剪切应力和屈服应力。剪切速率扫描模式下的屈服应力高于应变和应力扫描测试模式。