Magnetic fluid phase separation in an electric field

Abstract

The phase separation and structural organization of a thin layer of a magnetic fluid under the influence of a constant electric field are investigated. It is shown that the action of an electric field leads to the appearance of labyrinth structures in a thin layer of a magnetic fluid, which subsequently leads to the formation of a free charge at the boundary of this layer with the rest of the liquid volume. The results of the study of the current strength on the shear rate dependence made it possible to estimate the value of the surface charge density and the time of its formation in the near-electrode space. By artificially increasing the electrical conductivity of the initial magnetic fluid, it is shown that the formation of labyrinth structures in a magnetic fluid in an electric field occurs at a certain critical value of its electrical conductivity.

The Influence of Magnetic Fields on Electrophoretic Processes in Magnetic Colloids with Different Stabilization Mechanisms

“…2 from the original test. To do this, 5 mg of iodine per 10 mL of the sample was added to the system according to protocols published earlier [43,58]. This operation led to an increase in the electrical conductivity value from γ = 1.2 × 10 −6 S/m to γ = 1.4 × 10 −6 S/m.…”

Typical dampers and energy harvesters based on characteristics of ferrofluids

“…The second assumption is that although the solid-phase particles in ferrofluids are very dense, their total volume is less than 10% of that of the ferrofluids. Thus, they are considered a sparse phase [70].…”