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Method for preparing nano cobalt ferrite

A technology of cobalt ferrite and nano-cobalt, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., and can solve problems such as poor crystallization

Inactive Publication Date: 2013-07-17
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

M.Rajendran et al. gave a method for co-precipitating iron salt and cobalt salt solution with NaOH and H2O2 mixed solution to prepare cobalt ferrite, but this method has poor crystallization at 20°C. See M.Rajendran, R.C. Pullar, A.K.Bhattacharya, D.Das S.N.Chintalapudi, C.K.Majumdar, Magnetic properties of nanocrystalline CoFe2O4 powders prepared at room temperature: variation with crystallitesize, Journal of Magnetism and Magnetic Materials, 232 (2001), 71–83

Method used

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  • Method for preparing nano cobalt ferrite
  • Method for preparing nano cobalt ferrite
  • Method for preparing nano cobalt ferrite

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) Weigh 0.1784g (0.00066mol) FeCl with a molar ratio of 2:1 3 .6H 2 O and 0.07815 g (0.00033 mol) CoCl 2 .6H 2 O, dissolved in 50ml of distilled water, fully stirred to dissolve, the metal ion concentration is 0.02M.

[0021] 2) Weigh 1.6g (0.04mol) NaOH and dissolve it in 20ml distilled water, the NaOH concentration is 2M. After stirring evenly, add N dropwise to it 2 h 4 .H 2 O (85% hydrazine hydrate) 10ml , N 2 h 4 .H 2 O concentration is 5.6 mol / L.

[0022] 3) at room temperature Down (20 o C) Stir rapidly under the condition, slowly drop the mixed solution of alkali and hydrazine hydrate prepared in step 2) into the Fe, Co salt solution, and react for 2 hours.

[0023] 4) Fully wash the black precipitate produced by the reaction in step 3) with distilled water to a pH value of about 7, then wash with ethanol 2 to 3 times, and then dry naturally or in vacuum to obtain CoFe2O4 particles.

[0024]The X-ray diffraction spectrum of the sample obtained in ...

Embodiment 2

[0026] 1) Weigh 0.1784g (0.00066mol) FeCl with a molar ratio of 2:1 3 .6H 2 O and 0.07815 g (0.00033 mol) CoCl 2 .6H 2 O, dissolved in 50ml of distilled water, fully stirred to dissolve, the metal ion concentration is 0.02M.

[0027] 2) Weigh 1.6g (0.04mol) NaOH and dissolve it in 20ml distilled water, the NaOH concentration is 2M. After stirring evenly, add N dropwise to it 2 h 4 .H 2 O (85% hydrazine hydrate) 10ml , N 2 h 4 .H 2 O concentration is 5.6 mol / L.

[0028] 3) at 40 o C Stir rapidly under water bath conditions, slowly add the mixed solution of alkali and hydrazine hydrate prepared in step 2) dropwise into the Fe and Co salt solution, and react for 2 hours.

[0029] 4) Fully wash the black precipitate produced by the reaction in step 3) with distilled water to a pH value of about 7, then wash with ethanol 2 to 3 times, and then dry naturally or in vacuum to obtain CoFe2O4 particles. The average particle size is 9nm, it is superparamagnetic at room tem...

Embodiment 3

[0032] 1) Weigh 0.1784g (0.00066mol) FeCl with a molar ratio of 2:1 3 .6H 2 O and 0.07815 g (0.00033 mol) CoCl 2 .6H 2 O, dissolved in 50ml of distilled water, fully stirred to dissolve, the metal ion concentration is 0.02M.

[0033] 2) Weighing 1.2g (0.03mol) NaOH was dissolved in 20ml of distilled water, the NaOH concentration was 1.5M. After stirring evenly, add N dropwise to it 2 h 4 .H 2 O (85% hydrazine hydrate) 14ml, N 2 h 4 .H 2 O concentration is 7mol / L.

[0034] 3) at 20 o C Stir rapidly under water bath conditions, and slowly drop the mixed solution of alkali and hydrazine hydrate prepared in step 2) into the solution of Fe and Co salts, and react for 3 hours.

[0035] 4) Fully wash the black precipitate produced by the reaction in step 3) with distilled water to a pH value of about 7, then wash with ethanol 2 to 3 times, and then dry naturally or in vacuum to obtain CoFe2O4 particles. The average particle size is 3nm, it is superparamagnetic at room ...

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Abstract

The invention discloses a method for preparing nano-powder of nano cobalt ferrite (CoFe2O4) with a spinel structure at a low temperature. The preparation method comprises the steps of weighing ferric trichloride and cobaltous chloride in proportion, and mixing to prepare water solution A; evenly mixing the prepared NaOH or HOK aqueous alkali, and then dropwise adding N2H4.H2O to obtain solution B; rapidly stirring the water solution A obtained in the step 1 at 20-40 DEG C, and slowly dropwise adding the mixed solution B prepared in the step 2 into the water solution A to react, so as to obtain cobalt ferrite (CoFe2O4) powder sediment with a black spinel structure.

Description

technical field [0001] The invention relates to a preparation method of nano-cobalt ferrite powder, in particular to a nano-cobalt ferrite CoFe with spinel structure 2 o 4 method of preparation. Background technique [0002] Spinel-type cobalt ferrite is a magnetic material with excellent performance, which has many advantages such as high saturation magnetization, excellent corrosion resistance and wear resistance. It has been widely used in magnetic recording, magnetic elements and magnetic fluids. In addition, due to its high resistivity and significant magneto-optical Kerr effect, it has great application potential in wave-absorbing materials and new magneto-optical recording materials. See: [1] "Cobalt Ferrite Preparation and Research", Zhang Chao, Master's Degree Thesis of Henan University; [2] Cobalt Ferrite Micropowder Chemical Preparation Process and Its Absorbing Performance, Che Renchao, Li Yongqing, etc. , "Aerospace Materials Technology", 1999, No. 6; [3] Sy...

Claims

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Application Information

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IPC IPC(8): C01G49/00B82Y30/00C04B35/26
Inventor 张旭东
Owner LANZHOU UNIVERSITY
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