G0801 Brownian Dynamics Simulations on the Negative Magneto-Rheological Effect of a Suspension Composed of Rod-like Hematite Particles

Abstract

We have investigated the behaviors of rod-like hematite particles in a simple shear flow as well as in an applied magnetic field, in order to clarify the dependence of the negative magneto-rheological effect on particle aggregation and orientational distribution of particles. The present Brownian dynamics method has a significant advantage that it takes into account the spin rotational Brownian motion about the particle axis in addition to the ordinary translational and rotational Brownian motion. In contrast to the ferromagnetic rod-like particle that exhibits a single-peak-type orientational distribution, the present hematite particle has a linear-peak-type distribution with a much more gentle profile. However, this slightly reformed distribution makes a significant influence on the negative magnetorheological effect.