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High specific saturated magnetizing strengh Fe3O4 micro particles and its preparing method

A magnetization, high-ratio technology, used in inductor/transformer/magnet manufacturing, iron oxide, inorganic material magnetism, etc., can solve problems such as lower than saturation magnetization, achieve good magnetic responsiveness, simple preparation process, and dosage. less effect

Inactive Publication Date: 2004-02-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to overcome Fe 3 o 4 Confinement and defects of particles with lower than saturation magnetization, providing a high specific saturation magnetization Fe 3 o 4 Microparticles and methods for their preparation, such Fe 3 o 4 Microparticles have the characteristics of high specific saturation magnetization, small particle size, uniform particle size distribution, good dispersibility, and high stability, and can be used to prepare magnetic liquids, magnetic microbeads, magnetic drugs, etc.

Method used

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  • High specific saturated magnetizing strengh Fe3O4 micro particles and its preparing method
  • High specific saturated magnetizing strengh Fe3O4 micro particles and its preparing method

Examples

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Effect test

Embodiment 1

[0017] Embodiment 1: Prepare high specific saturation magnetization Fe according to the following steps 3 o 4 particle

[0018] 1. The air in the 1000ml four-neck garden bottom flask equipped with stirring, filling inert gas, constant pressure dropping funnel, and vacuum device is replaced with nitrogen;

[0019] 2. Weigh 3.2g FeCl respectively 3 ·6H 2 O(AR) and 1.7g FeSO 4 ·7H 2 Put O(AR) into the reactor prepared in step 1, add 50 times the weight of deoxygenated pure water to dissolve, and stir to form a uniform solution;

[0020] 3. Weigh 4g NaOH (AR), dissolve it with 400ml deoxygenated pure water to form an aqueous NaOH solution of about 3M, add it to a constant pressure dropping funnel, and stir it under N 2 It was dripped into the reactor under air protection, and a black solution was obtained after the dripping was completed.

[0021] 4. Add an aqueous solution containing 0.5 g of oleic acid to the black solution obtained in step 3, and stir for 1-2 hours.

[...

Embodiment 2

[0026] Embodiment 2: Prepare high specific saturation magnetization Fe according to the following steps 3 o 4 particle

[0027] 1. The air in the 1000ml four-necked round bottom flask equipped with stirring, filling inert gas, constant pressure dropping funnel and vacuum device is replaced with argon;

[0028] 2. Weigh 3.2g FeCl respectively 3 ·6H 2 O(AR) and 1.2g FeCl 2 4H 2 Put O(AR) into the reactor prepared in step 1, add 50 times the weight of deoxygenated pure water to dissolve, and stir to form a uniform solution;

[0029] 3. Weigh 5g of NaOH(AR), dissolve it with 400ml of deoxygenated pure water into about 3M NaOH aqueous solution, add a constant pressure dropping funnel, drop it into the reactor under stirring and Ar gas protection, and get a black solution after dropping .

[0030] 4. Add an aqueous solution containing 0.6 g of sodium oleate to the black solution obtained in step 3, and stir for 1 to 2 hours.

[0031] 5. Add the product obtained in step 4 int...

Embodiment 3

[0035] Embodiment 3: Prepare high specific saturation magnetization Fe according to the following steps 3 o 4 particle

[0036] 1, the air in the 1000ml four-neck garden bottom flask equipped with stirring, filling inert gas, constant pressure dropping funnel, and vacuum device is replaced with nitrogen;

[0037] 2. Weigh 4.0g NaOH(AR), put it into the reactor prepared in step 1, add 40 times the weight of deoxygenated pure water to dissolve NaOH, and stir to form a uniform solution;

[0038] 3. Weigh 3.2g FeCl respectively 3 ·6H 2 O(AR) and 1.7g FeSO 4 ·7H 2 O(AR), dissolved into an aqueous solution with 1000ml of deoxygenated pure water, added to a constant pressure dropping funnel, stirred and N 2 It was dripped into the reactor under air protection, and a black solution was obtained after the dripping was completed.

[0039] 4. Add an aqueous solution containing 0.7 g of sodium dodecylbenzenesulfonate to the black solution obtained in step 3, and stir for 1 to 2 hou...

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Abstract

A sort of high specific saturation magnetized Fe3O4 particle can be prepared through adding an organic surfactant to nano Fe3O4 solution obtained by traditional process feeding them to a nano mill, grinding and reacting the particles with the organic surfactant. After surface treatment the Fe3O4 particles are provided with less size, higher dispersion, higher stability. Its specific saturation magnetization is higher than 80emu / g and it is suitable for making magnetized liquid, magnetized particle and magnetized drug.

Description

technical field [0001] The present invention relates to Fe 3 o 4 Particles and preparation methods thereof, in particular to a nano-Fe with high specific saturation magnetization 3 o 4 Microparticles and methods for their preparation. Background technique [0002] Fe 3 o 4 As magnetic particles, it is widely used in the preparation of magnetic liquids, magnetic microbeads, magnetic drugs, etc. Such as the use of highly magnetic nano-Fe 3 o 4 The magnetic liquid made of particles is used in dynamic sealing of rotating shafts, loudspeakers, damping devices, mineral separation, precision grinding, etc. Magnetic microspheres are used in magnetic chemiluminescence immunoassay, cell separation, protein purification, nucleic acid separation, targeted drug delivery etc., have great application value. Fe 3 o 4 An important indicator for the use of particles in the above fields is the specific saturation magnetization, the higher the requirement, the better. However, curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01G49/08H01F1/11H01F41/02
Inventor 程海斌袁润章
Owner WUHAN UNIV OF TECH
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