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Electrorheological (ER) fluids are suspensions of polarizable semiconductor particles in dielectric liquids. The viscoplastic properties of ER fluids depend on the strength of the applied electric field up to the total loss of fluidity [1, 2]. The loss of fluidity of the ER fluid in an electric field occurs due to polarization interactions, leading to structuring of the dispersed phase. The formation of chain or pillar structures from separate particles and closing of the interelectrode gap occurs within milliseconds. The presence of a limiting value of the electric field strength is typical for the electrorheological effect, after which the structure formation takes place and the fluid enhances its viscoplastic properties. The magnitude of the ER effect is significantly affected by such factors as polarization, dielectric constant, conductivity, the applied electric field strength, the size, shape and structure of particles [3–9]. Another important factor affecting the properties of ER fluids is the water content in the dispersed phase [10]. Obviously, the aggregate functional properties of an ER fluid are determined by the composition and nature of the components. The barium titanyl acylates complexes are considered promising among other fillers of ER fluids [11–14]. The yield strength of an ER fluid based on barium titanyl oxalate, with the surface of nanoparticles covered by adsorption layer of urea molecules, can exceed 100 kPa in a 4 kV/mm field [15–17]. At the same time, the yield strength of barium titanate suspension obtained by calcination of acylate complexes in an electric field of 4 kV/mm does not exceed 1 kPa [18]. Thus, the ER efficiency of the acylate complexes is significantly reduced during calcination. Apparently, this occurs as a result of polar organic group elimination from the material, leading to a decrease in the polarizability of the filler particles. This work aims to reveal the influence of thermal treatment of acylate gels – the precursors of barium titanate and orthotitanate, used as ER fluid fillers, on the magnitude of the ER effect.

Influence of thermal treatment of nanometer-sized titanate and barium orthotitanate precursors on the electrorheological effect