G704 Negative Magneto-Rheological Effect of a Dispersion Composed of Spindle-like Hematite Particles

Abstract

We have investigated the negative magneto-rheological effect of a dispersion composed of spindle-like hematite (α-Fe_2O_3) particles by means of the experimental method. The spindle-like hematite particles were synthesized by aging a solution of FeCl_3 and KH_2PO_4 for 72 hours at 373K. In the present study we have considered a glycerol-water-based dispersion in order to clarify the influences of the shear rate and the magnetic field strength on the negative magneto-rheological effect. The measurement of the viscosity was carried out using the rotational-type rheometer in an external magnetic field generated by the Helmholtz coils.