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Graphene @Fe3O4 compound water base magnetorheological fluid and preparation method thereof

A magnetorheological fluid and graphene technology, applied in the petroleum industry, lubricating compositions, additives, etc., can solve the problems of difficulty in optimizing stability and magnetorheological effect at the same time, easy sedimentation of magnetorheological fluid, etc. Shear yield stress and magnetorheological effect, effect of high shear strain and low zero-field viscosity

Active Publication Date: 2015-06-03
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the contradictory problems that existing magnetorheological fluids are easy to settle, and the stability and magnetorheological effects are difficult to optimize simultaneously, and provides a graphene Fe 3 o 4 Composite water-based magnetorheological fluid and preparation method thereof

Method used

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  • Graphene @Fe3O4 compound water base magnetorheological fluid and preparation method thereof
  • Graphene @Fe3O4 compound water base magnetorheological fluid and preparation method thereof
  • Graphene @Fe3O4 compound water base magnetorheological fluid and preparation method thereof

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Effect test

Embodiment 1

[0021] Graphene Fe 3 o 4 The preparation method of composite water-based magnetorheological fluid comprises the following steps:

[0022] 1) Preparation of stable Fe 3 o 4 Water-based magnetic fluid:

[0023] 3.0g FeCl 2 4H 2 O and 6.3 g FeCl 3 ·6H 2 Dissolve O in 90mL of deionized water, place in a constant temperature water bath at 50°C, stir evenly, and slowly add 85mL of NaOH solution with a concentration of 1.34mol / L dropwise at a rate of 2 drops / second under vigorous mechanical stirring at 500r / min After the dropwise addition, continue to react for 80min, stop, and cool to room temperature; the above-mentioned reaction liquid is magnetically separated to remove the supernatant, and the obtained Fe 3 o 4 The black magnetic particles were dispersed in a certain volume of deionized water by ultrasound for 30 minutes, then centrifuged at 2000 rpm for 10 minutes, and the upper layer was taken to obtain stable Fe with a concentration of 30 mg / mL. 3 o 4 Water-based m...

Embodiment 2

[0029] Graphene Fe 3 o 4 The preparation method of composite water-based magnetorheological fluid comprises the following steps:

[0030] 1) Preparation of stable Fe 3 o 4 Water-based magnetic fluid:

[0031] 4.5g FeCl 2 4H 2 O and 7g FeCl 3 ·6H 2 Dissolve O in 90mL of deionized water, place in a constant temperature water bath at 50°C, stir evenly, and slowly add 90mL of NaOH solution with a concentration of 1.34mol / L dropwise at a rate of 3 drops / second under vigorous mechanical stirring at 500r / min ; Stop after the dropwise addition and continue to react for 90min, and cool to room temperature; the above-mentioned reaction liquid is magnetically separated to remove the supernatant, and the obtained Fe 3 o 4 The black magnetic particles were dispersed in a certain volume of deionized water by ultrasound for 30 minutes, then centrifuged at 2000 rpm for 10 minutes, and the upper layer was taken to obtain stable Fe with a concentration of 20 mg / mL. 3 o 4 Water-based ...

Embodiment 3

[0037] Graphene Fe 3 o 4 The preparation method of composite water-based magnetorheological fluid comprises the following steps:

[0038] 1) Preparation of stable Fe 3 o 4 Water-based magnetic fluid:

[0039] 3.5g FeCl 2 4H 2 O and 7.5 g FeCl 3 ·6H 2 Dissolve O in 90mL of deionized water, place it in a constant temperature water bath at 50°C, stir evenly, and slowly add 80mL of NaOH solution with a concentration of 1.34mol / L dropwise at a rate of 1 drop / second under vigorous mechanical stirring at 500r / min ; Stop after the dropwise addition and continue to react for 85min, and cool to room temperature; the above-mentioned reaction liquid is magnetically separated to remove the supernatant, and the obtained Fe 3 o 4 The black magnetic particles were dispersed in a certain volume of deionized water by ultrasound for 30 minutes, then centrifuged at 2000 rpm for 10 minutes, and the supernatant was taken to obtain stable Fe with a concentration of 50 mg / mL. 3 o 4 Water-b...

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Abstract

The invention relates to the field of intelligent magnetic materials and in particular relates to a graphene @Fe3O4 compound water base magnetorheological fluid and a preparation method thereof, solving the problems that existing magnetorheological fluids are easy to settle and the stability and magnetorheological effects of the magnetorheological fluids are difficult to optimize at the same time. The preparation method comprises the following steps: preparing a Fe3O4 water base magnetic fluid with FeCl2.4H2O and FeCl3.6H2O; sequentially adding concentrated sulfuric acid, potassium permanganate and hydrogen peroxide to natural flake graphite and sodium nitrate to prepare graphite oxide; and then carrying out ultrasonic dispersion on home-made graphite oxide to prepare graphene oxide, finally adding a surfactant, the Fe3O4 water base magnetic fluid and a reducing agent to graphene oxide, washing the solution with deionized water until the solution is neutral, and then dispersing graphene @Fe3O4 compound magnetic particles in the deionized water to undergo ultrasonic dispersion, removing the precipitates and taking the supernatant, namely the stable graphene @Fe3O4 compound water base magnetorheological fluid, wherein the magnetic particles are graphene @Fe3O4 and account for 5-35wt% of the whole. The method has the advantages of good stability, low zero field viscosity, high shear strain and wide operating temperature range.

Description

technical field [0001] The invention relates to the field of intelligent magnetic materials, specifically graphene Fe 3 o 4 Composite water-based magnetorheological fluid and its preparation method. Background technique [0002] Magneto-rheological fluid is a very typical intelligent magnetic material. It is usually a stable colloid formed by dispersing nano-scale magnetic powder evenly in the carrier liquid after surface activation treatment. When there is no external magnetic field, the magnetic particles in the magnetorheological fluid are in a disordered and disordered state due to Brownian motion, which is a well-flowing liquid. However, under the action of an external magnetic field, the apparent viscosity of the magnetorheological fluid can be in the It increases by at least 2 orders of magnitude in a short period of time (milliseconds), and exhibits mechanical properties similar to solids. Its strength is characterized by shear yield stress; its viscosity changes c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M173/02C10M125/10C10M177/00
Inventor 孙友谊刘亚青王妍于海林池慧娟赵贵哲
Owner ZHONGBEI UNIV
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