Characteristic features of the rheological behavior of dielectric layered-structure suspensions of hydrated metal oxides in an electric field

Abstract

In this paper suspensions containing hydrated oxides of magnesium and iron were objects of rheological studies. The different content of the “stoichiometric” water in fillers is attributable to the conditions of their precipitation and aging. According to the results of TGA - DTA “super-stoichiometric” water of all the samples was removed in the temperature range 130 - 150°C, indicating its strong bond with the surface. Filler ER activity is determined by the change in the shear stress of the ER-suspensions containing them under the external electric field. The important role in the manifestation of the ER effect is played not only by the quantity of “super-stoichiometric” water in the interlayer space of the disperse phase particles, but also by the steric conditions.