Physicochemical properties and composition of a magnetic kerosene-based fluid

The speed and absorption coefficient for the longitudinal propagation of ul trasound in a kerosene-based magnetic fluid (MF) and pure kerosene were stu died over the frequency range 12-132 MHz. The disperse phase of MF was comp rised of Fe3O4 magnetite particles stabilized by oleic acid. The parameters of progagation of longitudinal sound were measured in the temperature rang es 213-373 and 233-333 K for the MF and kerosene, respectively. The density and shear viscosity of the MF alone and kerosene were determined as functi ons of temperature. The temperature dependences of the experimentally measu red parameters were discussed. The volume fractions of the MF components (k erosene, magnetite, and oleic acid) were calculated and the volume fraction s of oleic acid sorbed at the surface of magnetite particles and dissolved in the dispersion liquid were estimated.