Carbonyl Iron Suspension With Core–Shell Structured Fe3O4@SiO2 Nanoparticle Additives and its Magnetorheological Property
Shang Hao PiaoHyun Sik ChaeHyoung Jin Choi
Abstract
Magnetic Fe 3 O 4 @SiO 2 nanoparticles were initially synthesized by a sol-gel process and introduced to a soft magnetic carbonyl iron particle-based magnetorheological (MR) fluid to improve its MR properties and dispersion stability. Structure and properties of the core-shell Fe 3 O 4 @SiO 2 nanoparticles were characterized, showing that they are soft magnetic. MR characteristics of two MR fluid systems with and without Fe 3 O 4 @SiO 2 additives were investigated and compared under different magnetic field strengths using a rotational rheometer, exhibiting typical MR behaviors. Dispersion stability of the MR fluid was also characterized by an optical analyzer system of Turbiscan.
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