title: Static yield stress of a magnetorheological fluid containing Pickering emulsion polymerized Fe2O3/polystyrene composite particles.
abstract: The flow behaviors of magnetorheological (MR) suspensions containing Pickering emulsion polymerized Fe2O3/polystyrene (PS) composite particles were reanalyzed 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 can describe the structural reformation process of the aligned fibers at various shear rates. Unlike the dynamic yield stress obtained from the Cho-Choi-Jhon (CCJ) model, the static yield stresses obtained from the Seo-Seo model exhibit the same quadratic dependence on the magnetic field strength for both pure Fe2O3 particle suspension and Fe2O3/PS particle suspensions, which is in agreement with the predictions of the polarization model. The static yield stress plausibly explains the difference in underlying mechanism of MR fluids.
authors.affiliation: RIAM, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Kwanakro-1, Kwanakgu, Seoul 151-744, Republic of Korea.
authors.forename: Youngwook P
authors.initials: YP
authors.lastname: Seo
authors.affiliation: Hybrid Materials Center, Korea Institute of Science and Technology (KIST), Hawolgokro 39, Sungbukku, 130-650, Republic of Korea.
authors.forename: Soonjong
authors.initials: S
authors.lastname: Kwak
authors.affiliation: Department of Polymer Science and Engineering, Inha University, Yonghyun4dong, Namku, Incheon 402-751, Republic of Korea. Electronic address: hjchoi@inha.ac.kr.
authors.forename: Hyoung Jin
authors.initials: HJ
authors.lastname: Choi
authors.affiliation: RIAM, Department of Materials Science and Engineering, College of Engineering, Seoul National University, Kwanakro-1, Kwanakgu, Seoul 151-744, Republic of Korea. Electronic address: ysseo@snu.ac.kr.
authors.forename: Yongsok
authors.initials: Y
authors.lastname: Seo
keywords: MR fluid activity; Seo–Seo model; Static yield stress