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Preparation for binary magnetic fluid

A magnetic liquid and liquid technology, applied in the field of materials, can solve problems such as the reduction of the quality of magnetic liquids

Inactive Publication Date: 2009-07-22
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, ferromagnetic or ferrimagnetic nanoparticles inevitably form self-assembled structures such as short chains and closed rings in the synthesis due to the static magnetostatic interaction, which reduces the quality of the magnetic liquid.

Method used

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example 1

[0049] Example 1. CoFe 2 o 4 —p-NiFe 2 o 4 Preparation of Binary Magnetic Liquid

[0050] Step 1: CoFe 2 o4 Magnetic liquid (A liquid) and p-NiFe 2 o 4 Preparation of Paramagnetic Liquid (B Liquid).

[0051] (1) Prepare ferrimagnetic CoFe by co-precipitation method 2 o 4 nanoparticles, and then synthesize φ A = 1.2% CoFe 2 o 4 Magnetic liquid mother liquor, its Q A = 0.16.

[0052] (2) Prepare paramagnetic Ni(OH) by co-precipitation method 2 2Fe(OH) 3 Nanoparticles (because of Ni(OH) 2 2Fe(OH) 3 is the preparation of NiFe 2 o 4 material precursors. Therefore Ni(OH) 2 2Fe(OH) 3 Nanoparticles are abbreviated as p-NiFe 2 o 4 nanoparticles). Then synthesize φ B = 1.2% virgin p-NiFe 2 o 4 Paramagnetic liquid mother liquor, its Q B = 0.16.

[0053] Step 2: Take V A =V B The A and B mother liquids are mixed to obtain a binary magnetic liquid containing A and B particles. its φ AB and φ AB，A , φ AB，B for:

[0054] φ AB = 1.2%

[0055] φ AB，A = φ ...

example 2

[0056] Example 2. γ-Fe 2 o 3 —p-MgFe 2 o 4 Preparation of Binary Magnetic Liquid

[0057] Step 1: γ-Fe 2 o 3 Magnetic liquid (A liquid) and p-MgFe 2 o 4 Preparation of Paramagnetic Liquid (B Liquid).

[0058] (1) Preparation of ferrimagnetic γ-Fe by co-precipitation method 2 o 3 nanoparticles, and then synthesize φ A = 2% γ-Fe 2 o 3 Magnetic liquid mother liquor, its Q A = 0.14.

[0059] (2) Prepare paramagnetic Mg(OH) by co-precipitation method 2 2Fe(OH) 3 Nanoparticles (due to Mg(OH) 2 2Fe(OH) 3 is the preparation of MgFe 2 o 4 The precursor of the substance, so the Mg(OH) 2 2Fe(OH) 3 Nanoparticles are abbreviated as p-MgFe 2 o 4 nanoparticles). Then synthesize φ B = 2% p-MgFe 2 o 4 Paramagnetic liquid mother liquor, its Q B = 0.16.

[0060] The second step: Dilute A mother liquor into φ A ′ = 1.0 % The secondary A mother liquor, dilute the B mother liquor in...

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Abstract

The invention relates to a manufacturing method for binary magnetic liquid, which comprises the following steps; firstly, ferrimagnetic nanoparticle with ferromagnetism, which is particle A, and weak magnetic paramagnetic nanoparticle, which is particle B, are produced respectively by a method of chemical coprecipitation, so that two nanoparticles with different magnetism are produced; secondly, the particle A and the particle B are made into ferromagnetic liquid A and paramagnetic liquid B having the same volume fraction phiA equaling phiB equaling phi0 with Q value within the range of 0.12-0.20 respectively by a Massart method; thirdly, liquid A and liquid B are mixed into a binary magnetic liquid. In the binary ionic magnetic liquid, field structure and field physical effects mainly originate from the ferromagnetic part, and weak magnetic part can generate modulation effect.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a magnetic liquid based on the coexistence of strong magnetic nanoparticles and weak magnetic nanoparticles in a base liquid. Background technique [0002] The magnetic liquid is a colloidal suspension composed of magnetic nanoparticles with a particle size of about 10 nm dispersed in the base liquid as a suspended phase. The physical properties of this liquid magnetic nanomaterial have the characteristic of responding to an external magnetic field. In order to prevent particle agglomeration, the French Massart proposed a method in 1980 to make ferrite MFe2O4 (M=Fe, Co, Mn and other divalent metals) nanoparticles adsorb charged groups on the surface and rely on electrostatic repulsion to keep the particles dispersed. . This magnetic liquid is called "ionic magnetic liquid" or "galvanic double layer magnetic liquid". For adsorbed H + The ionic magnetic liquid for...

Claims

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Application Information

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IPC IPC(8): H01F1/44H01F41/02
Inventor 李建高荣礼韩芍娜张廷珍文榜才
Owner SOUTHWEST UNIVERSITY