This study introduces magnetic MnFe₂O₄ nanoparticles and graphene oxide (GO) nanosheets to enhance magnetorheological (MR) properties and dispersion stability of the carbonyl iron (CI)-based MR fluid. The prepared CI/MnFe₂O₄/GO was transformed into CI/MnFe₂O₄/rGO through an annealing process and was used as an additive of the MR fluid. The shape, crystallinity, and magnetic properties of the composite were analyzed via SEM, TEM, EDS, XRD, and vibrating sample magnetometer. In addition, rotational rheometer and Turbiscan were used to examine the MR properties and dispersion stability of the MR fluid, respectively. The CI/MnFe₂O₄/rGO-based MR fluid exhibited higher shear stress, shear viscosity, and storage modulus than the CI-based MR fluid. The dispersion stability was enhanced due to GO with its low density and a large specific surface area, and the sedimentation ratio was improved approximately by 17% after 24 h owing to the reduced difference in the density between the magnetic particles and oil medium.

本研究介绍了磁性MnFe ₂ O ₄纳米颗粒和氧化石墨烯（GO）纳米片，以增强基于羰基铁（CI）的MR流体的磁流变（MR）特性和分散稳定性。通过退火工艺将所制备的CI / MnFe ₂ O ₄ / GO转化为CI / MnFe ₂ O ₄ / rGO，并用作MR流体的添加剂。通过SEM，TEM，EDS，XRD和振动样品磁力计分析了复合材料的形状，结晶度和磁性。此外，分别使用旋转流变仪和Turbiscan来检查MR流体的MR特性和分散稳定性。CI / MnFe ₂ O ₄/ rGO基MR流体比CI基MR流体表现出更高的剪切应力，剪切粘度和储能模量。由于GO的低密度和大比表面积，其分散稳定性得到了提高，并且 由于磁性颗粒和油介质之间的密度差减小，沉降率在24小时后提高了约17％。