Effect of the filler composition on the electrorheological response of dielectric suspensions in an enlarged temperature range

Abstract

In this article, we present the results of creation of fillers for electrosensitive rheological fluids, the rheological characteristics of which depend only on the electric field strength and are independent of the change in temperature. The material of the electrorheological fluid filler, nanosized titanium dioxide modified by aluminum cation, was synthesized by the sol-gel method. The rheological properties of electrorheological fluids on the base of synthetic MOBIL oil with TiO₂ particles alloyed with 7, 9, and 12 mol% of Al were investigated in the electric field strength varying from 0 to 3.5 kV/mm. The shear stress (τ > τ₀) of electrorheological fluids was determined by a Physica MCR-301 rheometer. The highest shear stress at T = 20°C was reached in electrorheological fluid with TiO₂ particles alloyed with 12 mol% of Al. Comparison of shear stress for electrorheological fluids with TiO₂ particles (12 mol% Al) annealed at T_an = 600°C, 700°C, and 800°C shows that the highest result was obtained for electrorheological fluid-3 (T_an = 700°C). The most stable values of shear stress in the temperature range from 5°C to 80°C were obtained for electrorheological fluid with TiO₂ particles alloyed with 12 mol% Al annealed at T_an = 800°C.