Abstract
Electrophysical and rheological characteristics of ER fluids with TiO2 particles doped with alumi-num and phosphorus and having anatase structure are considered in an extended temperature range (5 - 100 ° C). The mechanisms of leakage currents in the ER fluid in electric fields up to 3.5 kV/mm are determined. Conduction mechanisms such as thermionic ionization, electron injection from an electrode, thermal excitation of charges, field emission of electrons from an electrode, thermionic emission of electrons from an electrode, and field emission of electrons from traps are identified. Based on the analysis of the current-voltage characteristics of the ER fluid, the positive role of the additional doping of the dispersed phase particles with phosphorus compared with the known results for ER fluid with TiO2/Al particles was established. The use of double doping of particles of the dispersed phase made it possible to obtain stable dependences of the shear stress of electrorheological fluids on the electric field strength in the range of the temperature effects under study.
Highlights
Features of the Mechanisms of Conductivity of the ElectrorheologicalElectrophysical and rheological characteristics of ER fluids with TiO2 particles doped with aluminum and phosphorus and having anatase structure are considered in an extended temperature range (5–100◦C)
A distinctive feature and the most important advantage of electrorheological fluids (ERF) is their controllability with the help of external electric fields, which allows their use for the creation of adaptive electromechanical devices of new generation
Analysis of the electrical conductivity of the investigated compositions of ER fluids containing TiO2 particles doped with aluminum showed that high leakage currents in strong electric fields with strengths up to 3.0 kV/mm in the temperature range from 5 to 80◦C are caused by mechanisms such as thermal excitation of charge carriers, thermoelectronic ionization, as well as the injection of electrons from the electrode and Schottky emission
Summary
Electrophysical and rheological characteristics of ER fluids with TiO2 particles doped with aluminum and phosphorus and having anatase structure are considered in an extended temperature range (5–100◦C). The mechanisms of leakage currents in the ER fluid in electric fields up to 3.5 kV/mm are determined. Conduction mechanisms such as thermionic ionization, electron injection from an electrode, thermal excitation of charges, field emission of electrons from an electrode, thermionic emission of electrons from an electrode, and field emission of electrons from traps are identified. The use of double doping of particles of the dispersed phase made it possible to obtain stable dependences of the shear stress of electrorheological fluids on the electric field strength in the range of the temperature effects under study
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