Magnetorheology of carbonyl-iron suspension with iron/mcm-41 additive

Iron containg hexagonal mesoporous silica particle (Fe-MCM-41) was prepared and adopted into carbonyl-iron (CI) based magnetorheological (MR) suspension as an additive to improve the sedimentation problem of the CI based MR fluid. Structural properties and morphology of the synthesized Fe-MCM-41 particles were observed using SEM. Their MR properties such as oscillation characteristics and flow response (shear stress and shear viscosity) were examined via a rotational rheometer in parallel plate geometry equipped with a magnetic field supplier under external magnetic field strengths ranging from 0 to 257 kA/m. The addition of Fe-containing mesoporous particles into Cl suspension was found to improve not only MR behaviors but also sedimentation problem of the CI based MR fluid.