Aqueous magnetorheological (MR) suspensions of composite carbonyl iron particles (CCIPs) were prepared with carbonyl iron particles and an organic reagent coating (N-polyether, N, N, N,-acetyloxy) 2, 6-aminion-1, 3, 4-thiadiazole dimer (EAMTD). The properties of the CCIPs, including morphology, structure, and magnetic behaviors, were characterized using scanning electron microscopy (SEM) and a vibrating sample magnetometer (VSM). The MR properties of the aqueous MR suspensions were analyzed via a strain-controlled parallel disk rheometer equipped with a magnetic field source. The results show that the stability and redispersibility of the aqueous MR suspensions were greatly improved, and the yield stress is influenced by the EAMTD coating layer of the CCIPs.

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