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Method for preparing cobalt ferrite by coprecipitation

A technology of cobalt ferrite and co-precipitation method, which is applied in the field of preparing nano-cobalt ferrite, can solve problems affecting the application of magnetic materials, and achieve the effects of easy operation and control, good magnetic properties, and simple process

Inactive Publication Date: 2005-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to remove the surfactants wrapped around the ferrite nanoparticles in the microemulsion, which affects the application of magnetic materials.

Method used

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  • Method for preparing cobalt ferrite by coprecipitation
  • Method for preparing cobalt ferrite by coprecipitation
  • Method for preparing cobalt ferrite by coprecipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Co-precipitation method to prepare cobalt ferrite, such as figure 1 As shown, the steps are as follows:

[0027] 1). Weigh 21.6g FeCl 3 ·6H 2 O (0.08mol) and 9.5g CoCl 2 ·6H 2 O (0.04mol) was dissolved in 120ml of distilled water, the Fe / Co molar ratio was 2.0, stirred to obtain a mixed solution, and then the NaOH solution with a concentration of 6.0M was slowly poured under high-speed (3500r / min) stirring to adjust the pH of the solution value to 12.0, after stirring for 30min, a suspension A was formed;

[0028] 2). Soak the suspension A obtained in step 1) in a boiling water bath for 2 hours to obtain a precipitate;

[0029] 3). Wash the precipitate obtained in step 2) with deionized water for 15 times until the pH is 7.0, and filter to obtain a brown precipitate;

[0030] 4). Heat-treat the brown precipitate obtained in step 3) at 100°C for 2 hours, add distilled water after cooling and stir to form a suspension B;

[0031] 5). After dispersing the suspension...

Embodiment 2

[0033] Co-precipitation method to prepare cobalt ferrite, such as figure 1 As shown, the steps are as follows:

[0034] 1).Weigh 19.44gFeCl 3 ·6H 2 O (0.072mol) and 9.5g CoCl 2 ·6H 2 O (0.04mol) was dissolved in 100ml of distilled water, the Fe / Co molar ratio was 1.8, stirred to obtain a mixed solution, and then the KOH solution with a concentration of 5.0M was slowly poured under high-speed (2500r / min) stirring to adjust the pH of the solution value to 13.0, after stirring for 30min, a suspension A was formed;

[0035] 2). Soak the suspension A obtained in step 1) in a boiling water bath for 3 hours to obtain a precipitate;

[0036] 3). Wash the precipitate obtained in step 2) with deionized water for 10 times until the pH is 8.0, and filter to obtain a brown precipitate;

[0037] 4). Heat-treat the brown precipitate obtained in step 3) at 100°C for 3 hours, add distilled water after cooling and stir to form a suspension B;

[0038] 5). After dispersing the suspension ...

Embodiment 3

[0040] Co-precipitation method to prepare cobalt ferrite, such as figure 1 As shown, the steps are as follows:

[0041] 1).Weigh 23.76gFeCl 3 ·6H 2 O (0.088mol) and 9.5g CoCl 2 ·6H 2 O (0.04mol) was dissolved in 150ml of distilled water, the molar ratio of Fe / Co was 2.2, stirred to obtain a mixed solution, then slowly poured ammonia water under high-speed (3500r / min) stirring, adjusted the pH value of the solution to 11.0, and stirred for 60min After that, a suspension A is formed;

[0042] 2). Soak the suspension A obtained in step 1) in a boiling water bath for 1 hour to obtain a precipitate;

[0043] 3). Wash the precipitate obtained in step 2) with deionized water for 20 times until the pH is 6.0, and filter to obtain a brown precipitate;

[0044]4). Heat-treat the brown precipitate obtained in step 3) at 100°C for 1 hour, add distilled water after cooling and stir to form a suspension B;

[0045] 5). After dispersing the suspension B obtained in step 4) in a powerf...

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Abstract

A process for preparing nano-class cobaltic ferrite includes such steps as proportionally dissolving the water-soluble Fe salt and Co salt in water, high-speed stirring while slowly adding alkali or acid to regulate pH=11-13, stirring to become suspension, immersing in boiling water bath, washing with deionized water, filtering to obtain brown deposit, heat treating to become suspension, dispersing, and vacuum freeze drying to obtain granular cobaltic ferrite.

Description

technical field [0001] The invention relates to a method for preparing nano cobalt ferrite. Background technique [0002] In recent years, because spinel nano-ferrite has good electromagnetic properties and is widely used in information storage systems, medical diagnostic technology, magnetic fluid technology, magneto-caloric and refrigeration effects, people's research on this aspect is also growing concern. Of which cobalt ferrite CoFe 2 o 4 It has high magnetocrystalline anisotropy, high coercive force and magnetic saturation strength, which has attracted the interest of researchers. [0003] Currently, synthetic CoFe 2 o 4 There are many approaches to nanoparticles. Pileni et al. used O / W (oil-in-water type) colloidal particles to synthesize 2-5nm cobalt ferrite, and Shah and Ahn used W / O (water-in-oil type) microemulsion method to synthesize the particle size by heat treatment respectively. 50nm and 4.9nm nanoparticles; In addition, Morais et al. controlled the s...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/32C04B35/622
Inventor 戴红莲李世普邵海成王欣宇韩颖超黄福龙黄健王友法江昕
Owner WUHAN UNIV OF TECH
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