Abstract

Strontium titanyl oxalate (STO) particles were synthesized with the co-precipitationmethod. Suspensions made by dispersing the STO particles in silicone oil exhibit anexcellent electrorheological (ER) effect with high yield stress, high shear stress at highershear rate, and low current density. By analyzing the Fourier transform infrared spectra ofSTO particles heated at different temperatures and measuring the yield stresses of thecorresponding ER fluids, it is confirmed that the polar molecules absorbed on the particlesplay a crucial role in the giant ER effect. The phenomena observed in STO ER fluids canbe explained by using the model of a polar molecule dominated electrorheological (PM-ER)effect.

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