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Graphene @Fe3O4 compound organic 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 easy sedimentation of magnetorheological fluid, difficulty in simultaneously optimizing stability and magnetorheological effect, and achieve shear High strain, improved shear yield stress and magnetorheological effect, and wide temperature range

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 organic magnetorheological fluid and preparation method thereof

Method used

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  • Graphene @Fe3O4 compound organic magnetorheological fluid and preparation method thereof
  • Graphene @Fe3O4 compound organic magnetorheological fluid and preparation method thereof
  • Graphene @Fe3O4 compound organic magnetorheological fluid and preparation method thereof

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Effect test

Embodiment 1

[0022] Graphene Fe 3 o 4 The preparation method of composite organic magnetorheological fluid comprises the following steps:

[0023] 1) Preparation of stable Fe 3 o 4 Organic magnetic liquid:

[0024] 3.0g FeCl 2 4H 2 O and 6.8 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 90mL 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 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 Add a certain amount of organic solvent acetone to the black particles, stir at a speed of 400r / min, and ultrasonically disperse for 5 minutes at the same time, remove the supernatant by magnetic separation, then use acetone to ultrasonically disperse, magnetically se...

Embodiment 2

[0030] Graphene Fe 3 o 4 The preparation method of composite organic magnetorheological fluid comprises the following steps:

[0031] 1) Preparation of stable Fe 3 o 4 Organic magnetic liquid:

[0032] 4.5g 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 80mL 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 83min, and cool to room temperature; the above reaction liquid is magnetically separated to remove the supernatant, and the obtained Fe 3 o 4 Add a certain amount of organic solvent tetrahydrofuran to the black particles, stir at a speed of 400r / min, and ultrasonically disperse for 5 minutes at the same time, remove the supernatant by magnetic separation, and then use tetrahydrofuran to ultrasonically disperse, mag...

Embodiment 3

[0038] Graphene Fe 3 o 4 The preparation method of composite organic magnetorheological fluid comprises the following steps:

[0039] 1) Preparation of stable Fe 3 o 4 Organic magnetic liquid:

[0040] 3.5g FeCl 2 4H 2 O and 5.8 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 100mL 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 ; Stop after the dropwise addition and continue to react for 95min, and cool to room temperature; the above-mentioned reaction liquid is magnetically separated to remove the supernatant, and the obtained Fe 3 o 4 Add a certain amount of organic solvent absolute ethanol to the black particles, stir at a speed of 400r / min, and ultrasonically disperse for 5 minutes at the same time, remove the supernatant by magnetic separation, then use absolute ethanol to ultrasonically d...

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Abstract

The invention relates to the field of intelligent magnetic materials and in particular relates to a graphene @Fe3O4 compound organic 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: adding an organic solvent to FeCl2.4H2O and FeCl3.6H2O to prepare a Fe3O4 organic magnetic fluid; adding cellulose or imidazole to the organic solvent to prepare a homogeneous solution, then adding expanded graphite and carrying out ultrasonic dispersion to prepare a graphene organic solution; finally adding a surfactant, the Fe3O4 organic magnetic fluid and an organic radical carrier fluid to the graphene organic solution and carrying out ultrasonic dispersion, thus obtaining the stable graphene @Fe3O4 compound organic magnetorheological fluid, wherein magnetic particles are graphene @Fe3O4 and account for 10-30wt% of the graphene @Fe3O4 compound organic magnetorheological fluid. 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 organic 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 conti...

Claims

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Application Information

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IPC IPC(8): C10M125/10C10M161/00C10M141/06C10M141/10C10M177/00
Inventor 孙友谊刘亚青田小勇王妍于海林池慧娟赵贵哲
Owner ZHONGBEI UNIV
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