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Perfluor polyether oil-based magnetic liquid

A technology of perfluoropolyether oil and magnetic liquid, which is applied in the direction of magnetic liquid, organic material/organic magnetic material, etc., can solve the problems of inapplicability, limited application field, and inability to withstand radiation.

Inactive Publication Date: 2014-03-26
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above information, the surfactant and the base carrier liquid are all hydrocarbon organic substances, and the prepared magnetic liquid is unstable, unable to resist acid and alkali, high and low temperature, and the applicable field is limited.
[0004] Ester-based, kerosene-based, gasoline-based, and water-based magnetic fluids have reached a mature and practical stage, but with the expansion of the scope of application of these types of magnetic fluids, their disadvantages have become increasingly prominent, such as: cannot be used in high and low temperature environments, cannot It is resistant to acid and alkali, cannot seal corrosive media, cannot withstand radiation, cannot be used in extreme special environments such as space stations, etc., and perfluoropolyether oil-based magnetic fluids are both fluorine ethers because their surfactants and base carrier liquids are Its chemical properties are stable, it has many special properties, it can overcome the use defects of the above-mentioned special environment, and it has a strong application value

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Bare Fe 3 o 4 Preparation of Magnetic Nanoparticles

[0045] Weigh 5.40g FeCl 3 Dissolve in 400ml of deionized water, prepare a 0.05mol / L solution at room temperature for use, and control the temperature of the water bath at 32°C. Pour the configured Fe into the three-neck bottle 3+ Solution, the stirring speed is 300r / min, when the temperature is close to the preparation reaction temperature of 32°C, add 1.98g FeCl 2 For powder, reduce the stirring speed to 100r / min and continue stirring to dissolve evenly. Monitor the internal temperature of the iron-salt mixture at any time. When the temperature reaches 31-32°C, slowly pour in 20ml of 25% concentrated ammonia water, and the reaction solution will immediately turn black. Adjust the rotating speed to be 200r / min, and the reaction time is 30min to prepare bare Fe 3 o 4 magnetic nanoparticles.

[0046] (2) Effect of perfluoropolyether carboxylic acid surfactants on bare Fe 3 o 4 Coating Modification of Magne...

Embodiment 2

[0053] (1) Bare Fe 3 o 4 Preparation of Magnetic Nanoparticles

[0054] Weigh 54.0g FeCl 3 Dissolve in 400ml of deionized water, prepare a 0.5mol / L solution at room temperature for use, and control the temperature of the water bath at 42°C. Pour the configured Fe into the three-neck bottle 3+ Solution, the stirring speed is 300r / min, when the temperature is close to the preparation reaction temperature of 42°C, add 27.80g FeSO 4 For powder, reduce the stirring speed to 100r / min and continue to stir and dissolve evenly. Monitor the internal temperature of the iron-salt mixture at any time. When the temperature reaches 41-42°C, slowly pour in 120ml of 25% concentrated ammonia water, and the reaction solution will immediately turn black. Adjust the rotating speed to be 400r / min, and the reaction time is 15min to prepare bare Fe 3 o 4 magnetic nanoparticles.

[0055] (2) Effect of perfluoropolyether carboxylic acid surfactants on bare Fe 3 o 4 Coating Modification of Magn...

Embodiment 3

[0062] (1) Bare Fe 3 o 4 Preparation of Magnetic Nanoparticles

[0063] Weigh 54.0g FeCl 3 Dissolve in 400ml of deionized water, prepare a 0.5mol / L solution at room temperature for use, and control the temperature of the water bath at 52°C. Pour the prepared F into the three-neck bottle e 3+ Solution, the stirring speed is 300r / min, when the temperature is close to the preparation reaction temperature of 52°C, add 27.80g FeSO 4 For powder, reduce the stirring speed to 100r / min and continue to stir and dissolve evenly. Monitor the internal temperature of the iron-salt mixture at any time. When the temperature reaches 51-52°C, slowly pour in 150ml of 25% concentrated ammonia water, and the reaction solution will immediately turn black. Adjust the rotating speed to 400r / min, and the reaction time is 10min to prepare bare Fe 3 o 4 magnetic nanoparticles.

[0064] (2) Effect of perfluoropolyether carboxylic acid surfactants on bare Fe 3 o 4 Coating Modification of Magneti...

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Abstract

The invention discloses a perfluor polyether oil-based magnetic liquid. The magnetic liquid is composed of bare Fe[3]O[4] magnetic nano-particles, a perfluor polyether carboxylic acid surface active agent and a perfluor polyether oil-based carrier liquid, the ratio of the bare Fe[3]O[4] magnetic nano-particles (g) to the perfluor polyether carboxylic acid surface active agent (ml) is 40:1-1:1, and the ratio of the modified bare Fe[3]O[4] magnetic nano-particles (g) to the perfluor polyether carboxylic acid surface active agent (ml) is 1:20-2:1. The saturation magnetization of the perfluor polyether oil-based magnetic liquid is 14-600 Gs, the magnetic liquid has the excellent special performance of resisting to chemical corrosion, high temperature, low temperature resistance and radiation and never burning, and can work stably for a long time at the temperature of 40 DEG C below zero-200 DEG C at the pH value of 1-14, a magnetic liquid of a conventional type can not achieve the effect, and the perfluor polyether oil-based magnetic liquid is particularly suitable for space stations, aeronautics and astronautics and other military industry fields.

Description

technical field [0001] The invention relates to a magnetic liquid, in particular to a perfluoropolyether oil-based magnetic liquid. Background technique [0002] Magnetic liquid is a new type of nano-functional material, which is highly dispersed magnetic particles coated with surfactants in the base carrier liquid to form a colloidal suspension with nano-scale, "solid-liquid" two-phase homogeneous and stable mixing , in the gravitational field, magnetic field, electromagnetic, centrifugal field does not occur layered settlement. Because it has both the magnetism of solid materials and the fluidity of liquid materials, it can be quickly magnetized under the action of an external magnetic field to become magnetic. When the external magnetic field is removed, the magnetism disappears immediately, without coercive force and residual magnetism, that is, it shows Excellent superparamagnetism, so it has a series of special physical and chemical properties, nano characteristics an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F1/42
Inventor 李德才崔红超张志力
Owner BEIJING JIAOTONG UNIV
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