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A particle coating method for preparing magnetic liquid

A technology of magnetic particles and magnetic liquid, applied in the direction of magnetic liquid, inorganic material magnetism, ferrous oxide, etc., can solve the problem that high stability and high saturation magnetization cannot be taken into account at the same time.

Inactive Publication Date: 2017-01-18
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to make up for the current situation that the high stability and high saturation magnetization of the existing water-based magnetic liquid cannot be taken into account at the same time, the present invention provides a particle coating method for preparing magnetic liquid

Method used

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  • A particle coating method for preparing magnetic liquid
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Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Nano Fe 3 o 4 Preparation of Magnetic Particles: Configuring Fe 2+ and Fe 3+ The mixed solution, where Fe 2+ and Fe 3+ The molar ratio is 1:2, put the mixed solution in a constant temperature water bath at 40°C, add NH 3 ·H 2 O adjust the pH to 10, stir and ultrasonically disperse, the reaction time is 20min, place the reacted suspension under a magnetic field to settle the particles, and clean the separated magnetic particles;

[0026] (2) Coating the first layer of surfactant: disperse 2g of the cleaned magnetic particles into 100ml of deionized water to obtain a suspension, place the suspension in a constant temperature water bath at 40°C, add NH 3 ·H 2 O to adjust the pH to 10, add 7ml of oleic acid, stir and disperse ultrasonically for 30min, place the reacted suspension under a magnetic field to settle the particles, and clean the separated magnetic particles;

[0027] (3) Coating the second layer of surfactant: disperse the particles obtained in step ...

Embodiment 2

[0030] (1) Nano Fe 3 o 4 Preparation of Magnetic Particles: Configuring Fe 2+ and Fe 3+ The mixed solution, where Fe 2+ and Fe 3+ The molar ratio is 1:1, put the mixed solution in a constant temperature water bath at 50°C, add NH 3 ·H 2 O adjust the pH to 11, stir and ultrasonically disperse, the reaction time is 30min, place the reacted suspension under a magnetic field to settle the particles, and clean the separated magnetic particles;

[0031] (2) Coating the first layer of surfactant: disperse 5g of the cleaned magnetic particles into 100ml of deionized water to obtain a suspension, place the suspension in a constant temperature water bath at 50°C, add NH 3 ·H 2 O adjust the pH to 11, add 10ml oleic acid, stir and disperse by ultrasonic for 40min, place the reacted suspension under a magnetic field to settle the particles, and clean the separated magnetic particles;

[0032] (3) Coating the second layer of surfactant: disperse the particles obtained in step (2) in...

Embodiment 3

[0035] (1) Nano Fe 3 o 4 Preparation of Magnetic Particles: Configuring Fe 2+ and Fe 3+ The mixed solution, where Fe 2+ and Fe 3+ The molar ratio is 1.5:1, put the mixed solution in a constant temperature water bath at 50°C, add NH 3 ·H 2 O adjust the pH to 11, stir and ultrasonically disperse, the reaction time is 40min, place the reacted suspension under a magnetic field to settle the particles, and clean the separated magnetic particles;

[0036] (2) Coating the first layer of surfactant: disperse 10g of the cleaned magnetic particles into 100ml of deionized water to obtain a suspension, place the suspension in a constant temperature water bath at 60°C, add NH 3 ·H 2 O adjust the pH to 11, add 20ml oleic acid, stir and disperse ultrasonically for 50min, place the reacted suspension under a magnetic field to settle the particles, and clean the separated magnetic particles;

[0037] (3) Coating the second layer of surfactant: disperse the particles obtained in step (2...

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Abstract

The invention relates to a particle coating method for preparing magnetic liquid. The method comprises the following steps: preparing Fe3O4 magnetic nano particles by using a co-precipitation method; coating the Fe3O4 magnetic nano particles with three layers of surfactants, namely oleic acid, polyethylene glycol and agar, successively under the condition with certain temperature and certain pH value; and finally preparing the magnetic fluid. By using the method provided by the invention, the problem that the existing water-based magnetic fluid cannot have high stability and high saturation magnetization intensity at the same time is solved.

Description

technical field [0001] The invention relates to a particle coating method for preparing magnetic liquid, belonging to the technical field of magnetic materials. Background technique [0002] The magnetic liquid is a uniform and stable colloidal system formed by dispersing magnetic nanoparticles coated with surfactants into the base carrier liquid. There are three parts that make up the magnetic liquid, magnetic nanoparticles, surfactant and base carrier liquid. When classifying magnetic liquids, they are mainly distinguished according to the following two aspects: [0003] (1) Magnetic nanoparticles: Magnetic nanoparticles generally have ferrite particles (such as Fe 3 o 4 、MeFe 2 o 4 (Me=Co, Mn, Ni, etc.), metals and their alloys (Fe, Co, Ni and their alloys) particles, iron nitride particles, etc. Among them, the chemical stability of ferrite particles is better, and the saturation magnetization of iron nitride particles is the highest. Fe 3 o 4 nanoparticles. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/11H01F1/44C01G49/08
Inventor 边秀房郭同晓杨春成
Owner SHANDONG UNIV
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