Giant electrorheological fluid and preparation method thereof

Abstract

The invention provides a giant electrorheological fluid and a reparation method thereof. The giant electrorheological fluid is prepared from urea coated metal salt composite nanoparticles, a dispersing agent and an insulation base fluid, wherein each molecule of the dispersing agent contains a hydrophilic end and an oleophilic end; the metal salt composite nanoparticles are suspended in the insulation base fluid, the molecules of the dispersing agent are adsorbed on a solid liquid interface formed by the metal salt composite nanoparticles and the insulation base fluid, the hydrophilic ends tend to be adsorbed on the surfaces of the metal salt composite nanoparticles, and the oleophilic ends tend to extend to the insulation base fluid. By adding the amphiphilic dispersing agent, size of theagglomerated particles is reduced remarkably, settlement resistance is further improved, hardening of the nanoparticles is prevented effectively, so that stability of the giant electrorheological fluid is improved, and breakdown resistance of the giant electrorheological fluid is improved effectively.

Description

Technical field [0001] The invention relates to the field of electrorheological fluid materials, in particular to a giant electrorheological fluid and a preparation method thereof. Background technique [0002] Electrorheological Fluids (Electrorheological Fluids) is abbreviated as ER fluid, which is prepared by dispersing micro-nano solid particles with low conductivity and high dielectric constant in an insulating liquid with low dielectric constant. Normally, it is a suspension, and a liquid-solid transition can occur under the action of an electric field. Specifically, when an electric field of 1-5kV / mm is applied, the ER liquid exhibits solid-like properties, such as being able to transmit shear stress; the transition time from liquid-like properties to solid-like properties is about 1-10ms, And this state transition is reversible when the electric field is removed. This phenomenon is called the ER effect. [0003] Giant electrorheological fluid is a new type of smart mater...

AI Technical Summary

Problems solved by technology

[0006] (3) Poor redispersibility of giant electrorheological fluid

[0007] (4) The current density of giant electrorheological fluid is too high, and it is easy to break down under high electric field or high temperature state, which affects the normal operation of giant electrorheological devices and shortens the service life of giant electrorheological devices

At the same time, higher current density means higher energy consumption

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