▎ 摘　　要

In this study, the influence of particle geometry on electrorheological (ER) activity is examined by varying the aspect ratio of graphene oxide (GO)-wrapped silica materials. The GO-wrapped silica material-based ER fluid exhibits a high shear stress as the aspect ratio of the particle increases; this is attributed to the flow resistance and mechanical stability of the fluid. Additionally, the dielectric loss model is used to investigate the dielectric properties of ER fluids, which have been shown to be associated with the enhancement of ER activity. The GO-wrapped silica material with a higher aspect ratio exhibits a higher dielectric constant and shorter relaxation times for interfacial polarization, due to greater polarizability. Thus, the aspect ratio of GO-wrapped silica materials plays a prominent role in the enhancement of ER performance.