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Method for preparing magnetic nanosheet

A magnetic nanometer and magnetic material technology, applied in nanotechnology, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problem of low yield of nanoparticles, and achieve the effect of easy removal or recycling, low cost and wide variety

Active Publication Date: 2014-12-03
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In 2006, Professor Liu Ping of The University of Texas at Arlington led his team to prepare monodisperse rare earth permanent magnetic nanoparticles by surfactant-assisted ball milling and centrifugation of the supernatant. , this method can prepare magnetic nanoparticles with a uniform particle size distribution and a particle size of less than 30nm (partially 2-8nm), but the yield of nanoparticles obtained by centrifugation is very low
Chinese patent (Patent No. Publication No. CN 103231066A) discloses a method for preparing rare earth-transition permanent magnet alloy micro / nanoparticles using low temperature plus surfactant-assisted ball milling. This method can improve the coercive force of the material, but the obtained The scale range of nanomaterials is still 50-150nm

Method used

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  • Method for preparing magnetic nanosheet
  • Method for preparing magnetic nanosheet
  • Method for preparing magnetic nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] 1. Weigh the coarsely crushed PrCo 5 Put 5g of material (particle size less than 100μm) into a stainless steel ball mill jar, then add 100g of stainless steel balls (20g of 8mm, 80g of 5mm), then add 15g of NaCl solid particles (particle size of 100μm) and 1ml of oleic acid And 1ml of oleylamine as surfactant, finally add 100ml of n-heptane organic solvent.

[0070] 2. Seal the ball mill tank containing raw materials, grinding balls, surfactants, solid particles, and organic solvents in a glove box.

[0071] 3. Put the sealed ball mill jar on a GN-2 high-energy ball mill, and mill it at a voltage of 50v (about 300 rpm) for 20 hours. Take out the balls, pour the milled product into a centrifuge tube, shake and stir for 10 minutes, then let stand for 10 hours, as figure 2 (b) shown.

[0072] 4. Use a straw to remove the upper liquid and solid particle layer, leaving only the bottom layer of black PrCo 5 The nanosheet precipitate was washed five times with n-heptane, ...

Embodiment 2

[0096] 1. Weigh the coarsely crushed powdered PrCo 5 5g of material (its particle size is less than 100μm), put it into a stainless steel ball mill jar, then add 100g of stainless steel grinding balls (20g for 8mm, 80g for 5mm), and then add 15g of Al 2 o 3 Solid particles (particle size 100 μm) and 4ml of oleic acid are used as surfactants, and finally 100ml of n-heptane organic solvent is added.

[0097] 2. Seal the ball mill tank containing raw materials, grinding balls, surfactants, solid particles, and organic solvents in a glove box.

[0098] 3. Put the sealed ball mill jar on a GN-2 high-energy ball mill, and mill it for 10 hours at a voltage of 55v (about 350 rpm). Take out the balls, pour the milled product into a centrifuge tube, shake and stir for 10 minutes, and then let stand for 10 hours. It is also seen that solid particles and PrCo after ball milling 5 Clear separation of rare earth compounds.

[0099] 4. Use a pipette to remove the upper layer and the sol...

Embodiment 3

[0102] 1. Weigh the coarsely crushed powdered PrCo 5 Material 5g (particle size is less than 100μm), put into stainless steel ball mill tank, then add 100g of stainless steel balls (20g of 8mm, 80g of 5mm) and 1ml of oleic acid and 1ml of oleylamine surfactant; finally add 100ml of normal heptane.

[0103] 2. Seal the ball mill tank containing raw materials, grinding balls, surfactants and organic solvents in a glove box.

[0104] 3. Put the sealed ball mill jar on the GN-2 high-energy ball mill, and ball mill for 5 hours at a voltage of 50v (about 300 rpm). Then take out the ball mill jar, open the ball mill jar in the glove box, and add 15 g of NaCl solid particles (particle size 100 μm), and then seal it. The packaged ball mill jars were placed on a GN-2 high-energy ball mill to continue ball milling for 15 hours. Take out the balls, pour the milled product into a centrifuge tube, shake and stir for 10 minutes, and then let stand for 10 hours. A clear separation of soli...

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Abstract

The invention relates to a method for preparing a magnetic nanosheet. During ball milling, solid particles and a surface active agent are added to assist ball milling. The solid particles adopt NaCl, CaCl2, NdCl3, KF, CaF2, NdF3, DyF3, Al2O3, Nd2O3 or random combinations thereof. The surface active agent adopts a cationic, anionic, or non-ionic surface active agent including but not limited to oleic acid, oleylamine and the like. During ball milling, the solid particles work with the surface active agent to stop a nanosheet from being further cold welded and reunited, so that magnetic particles are further crushed, and an ultrathin magnetic nanosheet with a texture is prepared. The thickness of the nanosheet ranges from 10 to 50 nm, and the average thickness is about 20 nm. The magnetic nanosheet with a texture or magnetic anisotropy is used for preparing a high-performance permanent magnet, or for a high-performance soft / hard magnetic coupling magnet and a double (multi) principal phase hard magnetic coupling magnet, or in microwave absorption and the preparation of magnetic refrigeration materials.

Description

technical field [0001] The method relates to a preparation method of a magnetic nanometer material. Background technique [0002] Magnetic nanomaterials can be widely used as ordinary magnetic materials in fields such as life, medical treatment, and military affairs, and because of their unique nano-effects, they can also prepare high-performance soft / hard magnetic coupling magnets and dual hard magnetic main phase coupling magnets. , high coercivity nano permanent magnets, etc. Because nano-magnetic materials have small particle size and large specific surface area, they can reduce eddy current loss and enhance heat exchange, and can also be used in the fields of microwave absorption and magnetic refrigeration. [0003] However, since most magnetic materials are composed of highly reducing rare earth elements or transition metals, they are easily oxidized in the air, especially when their particle size enters the nanoscale range, they may spontaneously ignite due to strong...

Claims

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Application Information

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IPC IPC(8): B22F9/04H01F41/00B82Y40/00
Inventor 左文亮沈保根胡凤霞孙继荣
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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