It is established that a small additive of an antioxidant, tris(n-nonylphenyl) phosphite, gives rise to the formation of a polymerization-resistant magnetic fluid stabilized with linoleic acid. The coagulation stability of the fluid is studied with respect to isopropanol. For complete particle sedimentation, an alcohol concentration of 60% is required that is half as much as that for a fluid stabilized with oleic acid. The dispersed phase of the fluid is separated into coarse and fine fractions. Magneto-granulometric analysis of the fractions is carried out. The average magnetic moments of the particles in the fractions differ by approximately two times, and the initial susceptibilities differ by almost an order of magnitude at a close number concentrations of the particles. The temperature dependence of the viscosity of an isooctane-based finely dispersed sample is measured. The mobility of the samples remains preserved down to -100°C. The temperature dependence of the initial susceptibility of the coarse-dispersed sample exhibits a maximum in the region of -90°C. The results of the susceptibility measurement are compared with the available theoretical models.
展开▼
