Static Yield Stress of a Magnetorheological Fluid Containing Pickering Emulsion Polymerized Fe2O3/Polystyrene Composite Particles
Seo Youngwook Peter (1), Chuah Wei Huan (2), Seo Yongsok (3)*
(1) Dep. Mat. Sci., Seoul National University - Kwanakro 1, Kwanakku, Seoul - Korea, (2) Dep. Mat. Sci. Eng., Seoul National University, Kwanakro1 - Seoul - Korea, (3) Dept. Mat. Sci., Seoul National University - Kwanakro 1, Kwanakku, Seoul - Korea
The flow behaviors of magnetorheological (MR) suspensions containing Pickering emulsion polymerized Fe2O3/polystyrene (PS) composite particles were analyzed using the Seo-Seo model. The experimental shear stress data obtained experimentally from the magnetorheological fluid fit well to the Seo-Seo model, indicating that this model described the structural reformation process of the aligned fibers at various shear rates. Unlike the dynamic yield stress behaviors obtained from the Cho-Choi-Jhon (CCJ) model, the static yield stresses obtained from the Seo-Seo model applied to both both pure Fe2O3 particle suspension and Fe2O3/PS particle suspensions exhibited the same quadratic dependence on the magnetic field strength, in agreement with the predictions of the polarization model.