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A kind of rod-shaped cobalt ferrite powder and preparation method thereof

A technology of cobalt ferrite powder and cobalt ferrite, which is applied in the field of material science, can solve the problems of small specific surface area and poor dispersion of cobalt ferrite particles, and achieve the effect of increasing specific surface area, uniform shape and low equipment operation requirements

Active Publication Date: 2018-11-02
西安方科新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the CoFe prepared by the solid phase method 2 o 4 Larger particles, nano-scale grain size, CoFe prepared by sol-gel method 2 o 4 Smaller than the solid phase method, but the specific surface area is smaller, and the cobalt ferrite particles prepared by the hydrothermal method have poor dispersibility

Method used

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  • A kind of rod-shaped cobalt ferrite powder and preparation method thereof
  • A kind of rod-shaped cobalt ferrite powder and preparation method thereof
  • A kind of rod-shaped cobalt ferrite powder and preparation method thereof

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preparation example Construction

[0029] A rod-shaped CoFe 2 o 4 and preparation method thereof, comprising the following steps:

[0030] Step 1: CoFe 2 o 4 According to the molar ratio, respectively weigh the Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, with 1 mmol of CoFe 2 o 4 In total, add 40-80mL of water and 2mmol of citric acid, mix and stir magnetically to fully dissolve to obtain a reddish-brown mixed solution A; the role of citric acid is a complexing agent to slowly release metal ions, It also acts as a dispersant.

[0031] Step 2: Slowly add ammonia solution dropwise to the reddish-brown mixed solution A, adjust the pH value of the mixed solution A between 6.5 and 7.5, and continue stirring for 4 to 8 hours after obtaining the dark red suspension B;

[0032] Step 3: Transfer the suspension B to a larger beaker, place it in an oven at 160-200°C, and perform a sol-gel reaction for 2-3 hours to dehydrate it and remove organic matter;

[0033] Step 4: After the oven is cooled to room temperatu...

Embodiment 1

[0041] A rod-shaped CoFe 2 o 4 and preparation method thereof, comprising the following steps:

[0042] (1) According to CoFe 2 o 4 In the molar ratio, respectively weigh the Co(NO 3 ) 2 ·6H 2 O, 2mmol of Fe(NO 3 ) 3 9H 2 O, 40mL of water and 2mmol of citric acid were mixed and then magnetically stirred to fully dissolve to obtain mixed solution A;

[0043] (2) Slowly add ammonia solution dropwise to the mixed solution A, adjust the pH value of the mixed solution A to 6.5, and after obtaining the dark red suspension B, continue stirring for 4 h;

[0044] (3) Pour the suspension B into a larger beaker and place it in an oven at 160°C for 2 hours to dehydrate and remove organic matter;

[0045] (4) After the oven is cooled to room temperature, put the powder obtained after drying into a high-temperature furnace and burn at 900° C. for 1 hour to obtain cobalt ferrite powder.

[0046] (5) Mix 1 mg of the cobalt ferrite powder obtained in (4) and 500 mL of N,N-dimethylfo...

Embodiment 2

[0052] A rod-shaped CoFe 2 o 4 and preparation method thereof, comprising the following steps:

[0053] (1) According to CoFe 2 o 4 In the molar ratio, respectively weigh the Co(NO 3 ) 2 ·6H 2 O, 2mmol of Fe(NO 3 ) 3 9H 2 O, 50mL of water and 2mmol of citric acid, magnetically stirred after mixing, fully dissolved to obtain mixed solution A;

[0054] (2) Slowly add ammonia solution dropwise to the mixed solution A, adjust the pH value of the mixed solution A to 7, and after obtaining the dark red suspension B, continue stirring for 5.5 hours;

[0055] (3) Pour the suspension B into a larger beaker and place it in an oven at 170°C for 140 minutes to dehydrate and remove organic matter;

[0056] (4) After the oven is cooled to room temperature, put the powder obtained after drying into a high-temperature furnace and burn at 1000° C. for 2 hours to obtain cobalt ferrite powder.

[0057] (5) Mix 1 mg of the cobalt ferrite powder obtained in (4) and 600 mL of N,N-dimethy...

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Abstract

The invention discloses rod-like cobalt ferrite powder and a preparation method thereof. The preparation method comprises the following steps: taking Co(NO3)2.6H2O and Fe(NO3)3.9H2O as raw materials, preparing granular cobalt ferrite powder by adopting a sol-gel method, then taking N,N-dimethyl formamide as a solvent, hydrazine hydrate as a reducing agent and methyl mercaptoacetate as a complexing agent, and under the protection of nitrogen, further corroding the cobalt ferrite powder by adopting a one-step corrosion method, so that cobalt ferrite with a rod-like structure is obtained. The rod-like cobalt ferrite powder disclosed by the invention has the advantages that preparation process is simple in operation, and the period is short; and the prepared rod-like cobalt ferrite has the diameter about 90-100nm and the length about 600-700nm and is uniform in size, and the rod-like structure enables the specific surface area of cobalt ferrite to be increased.

Description

【Technical field】 [0001] The invention belongs to the field of material science, and relates to a rod-shaped cobalt ferrite powder and a preparation method thereof. 【Background technique】 [0002] Spinel-type cobalt ferrite (CoFe 2 o 4 ) is a kind of ferrimagnetic oxide. As a typical magnetic material, it has great research significance in basic science and technical applications. Ferrimagnetism means that when there is no external magnetic field, the magnetic moments inside the magnetic domains are in a partially offset and ordered state due to the exchange of electrons. Similar to ferromagnets, there are some remaining spontaneous magnetic moments. have the same essence. CoFe 2 o 4 Has its unique physical properties, chemical properties, catalytic properties and magnetic properties. For example, cobalt ferrite has unique properties such as large magnetocrystalline anisotropy constant, high Curie temperature, low energy loss at high frequency, high hardness, high coer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/00
CPCC01G51/00C01P2002/32C01P2002/72C01P2004/03C01P2004/16
Inventor 林营王晶晶
Owner 西安方科新材料科技有限公司
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