Viscosity and dispersion state of magnetic suspensions

► Viscosity behavior of magnetic suspensions in which nanomagnetic particles are discrete in polyacrylic liquid. ► Particle concentration and shear dependence of suspension viscosity examined. ► Low shear properties found to be sensitive to formation of particle aggregates. ► Viscosity behavior due to particle aggregation agrees with dispersion stability measured by sedimentation experiment. ► Viscosity actions of magnetic delay found to be quite correct and useful in evaluating discrete state of magnetic particles.