A preparation method of an electromagnetic rheological material with shear thinning

Abstract

The invention belongs to the technical field of functional composite materials and relates to a preparation technology of a material with a shear thinning electromagnetorheological property. Comparedwith other single component materials, the prepared composite material of a core-shell structure by taking ferriferrous oxide as a core and molybdenum disulfide as a shell and modifying molybdenum disulfide with titanium dioxide has obviously excellent electrorheological and magnetorheological properties. The preparation method is simple in preparation process and convenient to operate; titanium dioxide and molybdenum disulfide have excellent electrorheological properties and can generate a relatively high shear yield stress under the action of an electric field, and meanwhile, magnetic ferriferrous oxide has a relatively high magnetizing saturated degree and can generate a relatively high shear yield stress under the action of a magnetic field. Molybdenum disulfide has an excellent lubricating property, so that the material is low in cost, clean and non-toxic and relatively short in reaction time, and has wide application value.

Description

Technical field: [0001] The invention belongs to the technical field of functional composite materials, and relates to a preparation technology of a material with shear-thinning rheological properties; the prepared core is molybdenum disulfide with ferric oxide as the core and titanium dioxide modified on molybdenum disulfide Composite materials with shell structure have significantly better electrorheological and magnetorheological properties than their single-component materials. Background technique: [0002] Electrorheological fluid is a new type of smart material, which generally consists of polarizable particles dispersed in an insulating medium. Under the action of the electric field, the dispersed particles are polarized to form a fibrous structure, and the shear stress gradually increases with the increase of the electric field. When the electric field is removed, the fibrous structure will quickly return to a disordered state; the magnetic current Variable fluid i...

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Problems solved by technology

Due to the low yield stress and high leakage current density of electrorheological fluid, it will be broken down at a low electric field strength, which seriously limits the wide application of electrorheological fluid.

For this magnetorheological fluid, there is a large density difference between the particles and the carrier, which is prone to sedimentation, which severely limits the commercial application of magnetorheological fluid.

Due to the complex composition of ERFs and MRFs, there is still a lack of effective mechanisms to describe the ERF and MRF effects

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