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Preparation method of CoFe2O4 magnetic nano material

A magnetic nano, cofe2o4 technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of long heat treatment time of reactants, environmental pollution, waste of resources, etc., and achieve short synthesis time, simple process flow, and high-quality products low cost effect

Inactive Publication Date: 2013-02-13
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) In this patent, the aging reaction time and calcination time are 2~3h and 6h respectively, and the heat treatment time of the reactant is too long, resulting in waste of resources
[0007] (2) Since a large amount of saturated organic acid solution is used in this patent, a large amount of organic waste liquid will be produced after the reaction, causing serious pollution to the environment

Method used

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  • Preparation method of CoFe2O4 magnetic nano material
  • Preparation method of CoFe2O4 magnetic nano material
  • Preparation method of CoFe2O4 magnetic nano material

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preparation example Construction

[0016] The present invention is CoFe 2 o 4 The preparation method of magnetic nanometer material, its step is:

[0017] (1) Weigh ferric nitrate and cobalt nitrate into water to prepare a mixed solution, the molar ratio of ferric nitrate and cobalt nitrate is 2:1;

[0018] (2) Weigh sodium hydroxide and add water to prepare a solution as a precipitant, heat to 60~92°C, the molar ratio of sodium hydroxide to cobalt nitrate is 9~16:1; the precipitant or the aqueous solution of dimethylamine , or an aqueous solution of triethylamine, or an aqueous solution of potassium hydroxide, the molar ratio of dimethylamine, triethylamine, potassium hydroxide and cobalt nitrate is 9~16:1;

[0019] (3) Add the mixed solution to the precipitant under stirring condition at a uniform speed within 30 minutes, maintain the temperature, and age for 30 to 120 minutes, filter and wash the precipitate until the filtrate is neutral, dry the obtained product, Grinding dark brown precursor;

[0020] ...

Embodiment 1

[0026] Weigh 3.6051g of NaOH and add 100ml of distilled water into a 500ml three-necked flask as a precipitant solution, which is heated to 92°C at a stirring rate of 1500r / min. Weigh 2.9086g Co(NO 3 ) 2 .6H 2 0 and 8.0809gFe(NO 3 ) 3 .9H 2 0 to prepare a 200ml mixed solution, put it in a constant pressure dropping funnel and add it to the 100ml precipitant prepared in advance at a uniform speed within 30min. After the precipitation is complete, keep the temperature at 92°C, age for 1 hour, filter and wash the precipitate until the pH of the filtrate is 7, dry the obtained product in a vacuum oven at 105°C, and grind to obtain a dark brown precursor.

[0027] Finally, the precursor was calcined at 800 °C for 1 h to obtain black CoFe 2 o 4 magnetic nanopowder.

[0028] Such as figure 1 As shown, all the characteristic peaks in the spectrum: 2θ=18.24°, 30.06°, 35.44°, 43.10°, 53.48°, 57.02°, 62.62°, 74.06° and 22-1086 (CoFe 2 o 4 ) The standard spectrum is consistent...

Embodiment 2

[0031] Weigh 6.4016g of NaOH and add 100ml of distilled water into a 500ml three-necked flask as a precipitant solution, and heat it to 92°C at a stirring rate of 1500r / min. Weigh 2.9114g Co(NO 3 ) 2 .6H 2 0 and 8.0821gFe(NO 3 ) 3 .9H 2 0 to prepare a 200ml mixed solution, put it in a constant pressure dropping funnel and add it to the 100ml precipitant prepared in advance at a uniform speed within 30min. After the precipitation is complete, keep the temperature at 92°C, age for 1 hour, filter and wash the precipitate until the pH of the filtrate is 7, dry the obtained product in a vacuum oven at 105°C, and grind to obtain a dark brown precursor.

[0032] Finally, the precursor was calcined at 800 °C for 1 h to obtain black CoFe 2 o 4 magnetic nanopowder.

[0033] 2. Different aging temperature:

[0034] name Precipitant dosage / mol Aging temperature / ℃ Aging time / min Calcination temperature / ℃ Saturation magnetization / emu.g -1 Coercivity / Oe E...

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Abstract

The invention provides a preparation method of a CoFe2O4 magnetic material. The preparation method comprises steps as follows: preparing a certain amount of ferric nitrate Fe(NO3)3.9H2O and a certain amount of cobalt nitrate Co(NO3)2.6H2O into a mixed solution; slowly adding to a NaOH solution with a certain concentration at a certain temperature; then agitating the reaction solution under reinforcement; maintaining the reaction temperature for a period of time; then filtering and washing until the filtrate is neutral; drying the product; grinding to obtain black brown precursors; and thermally processing the precursors for 1 hour at a certain temperature, so as to obtain the CoFe2O4 magnetic nano material.

Description

technical field [0001] The invention relates to a preparation method of magnetic nanometer material. Background technique [0002] Cobalt ferrite (CoFe 2 o 4 ) is a traditional spinel-type ferrimagnetic compound. Compared with other similar ferrites, CoFe 2 o 4 It has the characteristics of high coercive force, magnetocrystalline anisotropy constant and Curie point, moderate saturation magnetization, high resistivity, good chemical stability and high mechanical strength. These excellent properties make them have broad application prospects in permanent magnets, magnetic recording and magnetic fluids. Currently, synthetic CoFe 2 o 4 There are many methods for nanomaterials, such as oxide method, chemical co-precipitation method, sol-gel method, microemulsion method, etc. Among them, the chemical co-precipitation method has the advantages of simple experimental conditions, high activity of reactants, and fine particle size. [0003] Preparation of CoFe by co-precipitati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y30/00
Inventor 冯辉霞陈柏屹张德懿张建强雒和明陈姣郑翰
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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