A kind of preparation method of cobalt ferrite nano magnetic material

A nano-magnetic material, cobalt ferrite technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of easy agglomeration of magnetic materials and poor dispersion of magnetic nanoparticles, and achieve high saturation magnetization. The effect of uniform diameter distribution and high product purity

Inactive Publication Date: 2017-09-01
烟台鑫洋电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: in view of the nano-ferrite prepared by sol-gel method, co-precipitation method, etc., because the magnetic material is easy to agglomerate, the defect of poor dispersion of magnetic nanoparticles usually prepared, the present invention provides A kind of preparation method of cobalt ferrite nano magnetic material
The present invention cultivates Lactobacillus acidophilus through liquid fermentation, centrifuges to obtain bacterial fermentation liquid, and concentrates alcohol precipitation to obtain bacterial polysaccharides, which are added when cobalt nitrate and ferric nitrate sol-gel form cobalt ferrite, and on the surface of cobalt ferrite Form a protective film so that it will no longer agglomerate and increase and accelerate flocculation to obtain a gel. After high-temperature calcination, the bacterial polysaccharide is decomposed and removed to expose the coated cobalt ferrite, and the cobalt ferrite nano-magnetic material can be obtained, which solves the problem. At present, nano-ferrite prepared by sol-gel method and co-precipitation method are prone to agglomeration, which makes the dispersion of magnetic nanoparticles poor, and can be widely used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First, weigh 8g of beef extract, 8g of peptone, 3g of yeast extract, 1g of dipotassium hydrogen phosphate, 3g of sodium acetate, 1g of triammonium citrate, 18g of glucose and 15g of agar into 1000mL of distilled water, stir well and use a concentration of 1mol / L Adjust the pH to 6.0 with hydrochloric acid, and use a high-pressure steam sterilizer to sterilize at 120°C for 20 minutes to obtain a fermentation medium; then insert the activated Lactobacillus acidophilus into the above-mentioned fermentation medium according to the inoculum size of 10%, and in 35 Shake the flask for fermentation at 200r / min at 200°C for 28 hours. After the cultivation, refrigerate and centrifuge at 10,000r / min in a horizontal centrifuge at 4°C for 15 minutes, separate and remove the filter residue to obtain the upper layer of fermentation liquid; again concentrate the above fermentation liquid in a vacuum Concentrate to 1 / 3 of its original volume to obtain a fermented concentrate, add 5 times...

example 2

[0021]First weigh 9g of beef extract, 9g of peptone, 4g of yeast extract, 1g of dipotassium hydrogen phosphate, 4g of sodium acetate, 1g of triammonium citrate, 19g of glucose and 17g of agar into 1100mL of distilled water, stir well and use a concentration of 1mol / L Adjust the pH to 6.3 with hydrochloric acid, and use a high-pressure steam sterilizer to sterilize at 125°C for 25 minutes to obtain a fermentation medium; secondly, insert the activated Lactobacillus acidophilus into the above-mentioned fermentation medium according to the inoculum size of 10%, and in 37 Shake flask fermentation at 250r / min at ℃ for 30h. After the cultivation, refrigerate and centrifuge at 11000r / min in a horizontal centrifuge at 5℃ for 17min, separate and remove the filter residue to obtain the upper layer fermentation liquid; again concentrate the above fermentation liquid in vacuum Concentrate to 1 / 3 of its original volume to obtain a fermented concentrate, add 6 times its volume of absolute et...

example 3

[0024] First, weigh 10g of beef extract, 10g of peptone, 5g of yeast extract, 2g of dipotassium hydrogen phosphate, 5g of sodium acetate, 2g of triammonium citrate, 20g of glucose and 20g of agar into 1200mL of distilled water. Adjust the pH to 6.5 with hydrochloric acid, and use a high-pressure steam sterilizer to sterilize at 130°C for 30 minutes to obtain a fermentation medium; secondly, insert the activated Lactobacillus acidophilus into the above-mentioned fermentation medium according to the inoculum size of 10%, and in 40 Shake flask fermentation at 300r / min at 300°C for 32 hours. After the cultivation, refrigerate and centrifuge at 12,000r / min in a horizontal centrifuge at 6°C for 20 minutes, separate and remove the filter residue to obtain the upper layer of fermentation liquid; again concentrate the above fermentation liquid in a vacuum Concentrate to 1 / 3 of its original volume to obtain a fermented concentrated liquid, add absolute ethanol 7 times its volume to the c...

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Abstract

The invention relates to a preparation method of a cobalt ferrite nano magnetic material and belongs to the technical field of nano magnetic materials. Lactobacillus acidophilus is cultured through liquid fermentation, centrifugal separation is performed to obtain a bacterial fermentation liquor, bacterial polysaccharide is prepared through concentration and alcohol precipitation, cobalt nitrate and ferric nitrate are added during sol-gel cobalt ferrite forming, a layer of protective film is formed on the surface of cobalt ferrite, agglomeration increase occurs no longer, flocculation is accelerated to obtain gel, high-temperature calcination and decomposition are performed to remove the bacterial polysaccharide and make the wrapped cobalt ferrite exposed, namely the cobalt ferrite nano magnetic material is obtained, the problem that at present, the nano ferrite prepared by adopting a sol-gel method, a coprecipitation method and the like easily produces agglomeration and accordingly the magnetic nanoparticles are poor in dispersibility is solved, and the preparation method can be widely popularized and used.

Description

technical field [0001] The invention relates to a preparation method of a cobalt ferrite nano magnetic material, which belongs to the technical field of nano magnetic materials. Background technique [0002] Ferrite is a new type of non-metallic magnetic material that has developed rapidly since the 1940s. Compared with metal magnetic materials, ferrite has the advantages of large resistivity, high dielectric properties, and high magnetic permeability at high frequencies. Ferrite magnetic material can be used chemical formula MFe 2 o 4 express. Ferrite magnetic materials are manufactured by sintering mixtures of these metal compounds. The main characteristics of ferrite magnetic materials are that the resistivity is much larger than that of metal magnetic materials, which suppresses the generation of eddy currents and makes ferrite magnetic properties applicable to high-frequency fields. Cobalt ferrite magnetic powder has unique physical and chemical properties, catalyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
CPCC01G49/0018C01P2006/40C01P2006/42
Inventor 姜世亮颜廷宪逄玉涛陈先进
Owner 烟台鑫洋电子有限公司
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