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Preparation method of uniform-grain-size spherical nano cobalt

A technology of nano-cobalt and particle size, applied in the field of preparation of spherical nano-cobalt with uniform particle size, can solve problems such as product agglomeration

Inactive Publication Date: 2013-12-11
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the nano-cobalt products obtained by the traditional electroless plating process have a wide particle size distribution, and due to its large specific surface area and its own magnetism, the product agglomeration phenomenon is relatively serious

Method used

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  • Preparation method of uniform-grain-size spherical nano cobalt

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: Prepare uniform particle size spherical nano-cobalt according to the following steps

[0020] (1) Prepare 1L each of 0.01mol / L cobalt sulfate aqueous solution and 0.011mol / L sodium carbonate aqueous solution, and mix the prepared cobalt sulfate aqueous solution and sodium carbonate aqueous solution to obtain basic cobalt carbonate suspension;

[0021] (2) Next, add 0.03 mol of reducing agent sodium hypophosphite to the above suspension, and raise the temperature of the mixture to the reaction temperature of 25°C at 2°C / min under the stirring condition of 250 rpm;

[0022] (3) Then add 0.0001mol trace complexing agent sodium citrate;

[0023] (4) After reacting for 0.5 hours, the product was separated, and the product was washed several times with ethanol and deionized water to obtain a black precipitate, which was dried at 70°C to obtain spherical nano-cobalt with uniform particle size.

Embodiment 2

[0024] Embodiment 2: Prepare spherical nano-cobalt with uniform particle size according to the following steps

[0025] (1) Prepare 1 L of 0.055 mol / L cobalt sulfate aqueous solution and 0.0687 mol / L sodium carbonate aqueous solution respectively, and mix the prepared cobalt sulfate aqueous solution and sodium carbonate aqueous solution evenly to form a basic cobalt carbonate suspension;

[0026] (2) Next, add 0.22mol of reducing agent hydrazine hydrate to the above suspension, and raise the temperature of the mixture to the reaction temperature of 47°C at 3.5°C / min under the stirring condition of 375 rpm;

[0027] (3) Then add 0.00055 mol trace complexing agent sodium tartrate;

[0028] (4) After reacting for 1.25 hours, the product was separated, and the product was washed several times with ethanol and deionized water to obtain a black precipitate, which was dried at 70°C to obtain spherical nano-cobalt with uniform particle size.

Embodiment 3

[0029] Embodiment 3: Prepare uniform particle size spherical nano-cobalt according to the following steps

[0030] (1) Prepare 1L each of 0.1 mol / L cobalt sulfate aqueous solution and 0.15 mol / L sodium carbonate aqueous solution, and mix the prepared cobalt sulfate aqueous solution and sodium carbonate aqueous solution evenly to form a basic cobalt carbonate suspension;

[0031] (2) Next, add 0.5 mol of reducing agent potassium borohydride to the above suspension, and raise the temperature of the mixture to the reaction temperature of 70°C at 5°C / min under the stirring condition of 500 rpm

[0032] (3) Then add 0.001mol trace complexing agent thiourea;

[0033] (4) After reacting for 2 hours, the product was separated, and the product was washed several times with ethanol and deionized water to obtain a black precipitate, which was dried at 70°C to obtain spherical nano-cobalt with uniform particle size.

[0034] The transmission electron micrograph of the uniform particle si...

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Abstract

The invention discloses a preparation method of uniform-grain-size spherical nano cobalt. The preparation method comprises the following steps: adding traces of complexing agent into a mixed system of a cobalt source which adopts basic cobaltous carbonate, and adequate reducing agent; finally, obtaining the uniform-grain-size spherical nano cobalt, wherein the grain diameter of the spherical nano cobalt is 60nm. The preparation method is simple in process, simple and convenient to operate, low in raw material price and low in cost, and is very suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of spherical nano-cobalt with uniform particle size. Background technique [0002] As a high-performance magnetic recording material, magnetic fluid, and wave-absorbing material, nano-metal cobalt is widely used in fields such as hard alloys, batteries, catalytic materials, and permanent magnets. Therefore, the research on the synthesis method of nano-metal cobalt has attracted much attention. Wu Chengyi et al. (ZL 200410068855.4 and 200510011735.5) used CoO x and Co(OH) 2 As a precursor material, it is then reduced in a high-temperature hydrogen environment through a tube furnace to obtain spherical nano-cobalt. Nie Zuoren et al. (ZL 200610067164.1) dissolved cobalt oxalate in ammonia water to obtain a clear cobalt-ammonia complex solution, which was then pre-frozen in liquid nitrogen, followed by vacuum drying to obtain a precursor, and hydrogen reduction was ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 程志鹏徐继明仲慧赵宜江褚效中张莉莉黄辉殷竟洲许永艾
Owner HUAIYIN TEACHERS COLLEGE
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