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Preparation of nano cobalt granule

A technology of nano-cobalt and particles, which is applied in the field of preparation of nano-cobalt particles, can solve the problems of inability to obtain particle size, good dispersion, single composition, etc., and achieve the effect of pollution-free by-products, simple preparation method, and easy-to-obtain raw materials

Inactive Publication Date: 2011-03-23
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nano-cobalt particles that is easy to operate, low-cost and environmentally friendly for the defects in the above-mentioned prior art, so as to solve the problem that the liquid-phase reduction method cannot obtain small particle size, good dispersibility and high composition. The conundrum of a single cobalt nanoparticle

Method used

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  • Preparation of nano cobalt granule
  • Preparation of nano cobalt granule
  • Preparation of nano cobalt granule

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The specific steps of the method for preparing nano cobalt particles provided in this embodiment are as follows:

[0032] a) Preparation of template agent: Add the third-generation product (3G) of polyamide-amine dendrimer with benzene ring as the core to double distilled water, stir at 15~30℃ to completely dissolve it, and prepare 1mmol / L template agent solution;

[0033] b) Preparation of cobalt salt solution: add cobalt chloride to double distilled water, stir at 15-30°C to completely dissolve it, prepare 40mmol / L cobalt chloride solution;

[0034] c) At 15~30℃, add 10ml of the 40mmol / L cobalt chloride solution prepared above dropwise to 10ml of the 1mmol / L template solution prepared above, after dripping, continue to stir for 1~3 hours, where: cobalt The molar ratio of salt to template is 40:1;

[0035] d) Put NaBH at 15~30℃ 4 Add to double distilled water, make 10ml of 0.16mol / L sodium borohydride solution, and quickly add it to the mixed solution obtained in step c) aft...

Embodiment 2

[0040] The specific steps of the method for preparing nano cobalt particles provided in this embodiment are as follows:

[0041] a) Preparation of template agent: Add the third-generation product (3G) of polyamide-amine dendrimer with benzene ring as the core to double distilled water, stir at 15~30℃ to completely dissolve it, and prepare 1mmol / L template agent solution;

[0042] b) Preparation of cobalt salt solution: add cobalt chloride to twice-distilled water, stir at 15~30℃ to completely dissolve it, prepare 30mmol / L cobalt chloride solution;

[0043] c) At 15~30℃, add 10ml of the 30mmol / L cobalt chloride solution prepared above dropwise to 10ml of the 1mmol / L template solution prepared above, and continue to stir for 1 to 3 hours after dripping. The molar ratio of salt to template is 30:1;

[0044] d) Put NaBH at 15~30℃ 4 Add to double distilled water, make 10ml of 0.12mol / L sodium borohydride solution, and quickly add it to the mixed solution obtained in step c) after prepara...

Embodiment 3

[0048] The specific steps of the method for preparing nano cobalt particles provided in this embodiment are as follows:

[0049] a) Preparation of template agent: Add the third-generation product (3G) of polyamide-amine dendrimer with benzene ring as the core to double distilled water, stir at 15~30℃ to completely dissolve it, and prepare 1mmol / L template agent solution;

[0050] b) Preparation of cobalt salt solution: add cobalt chloride to twice-distilled water, stir at 15-30°C to dissolve it completely, and prepare 20mmol / L cobalt chloride solution;

[0051] c) At 15~30℃, add 10ml of the 20mmol / L cobalt chloride solution prepared above dropwise to 10ml of the 1mmol / L template solution prepared above, and continue to stir for 1 to 3 hours after dropping. The molar ratio of salt to template is 20:1;

[0052] d) Put NaBH at 15~30℃ 4 Add to double distilled water, make 10ml of 0.08mol / L sodium borohydride solution, and quickly add it to the mixed solution obtained in step c) after pr...

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Abstract

The invention discloses a preparation method of nano-particles of cobalt, which comprises the steps of: adopting polyamide-amine dendritic compounds taking benzene ring as core as a template agent to mix with cobalt salts, causing the Co<2+> to combine in the interior and the exterior of the empty cavity of the dendritic compound by utilizing the strong coordination of a plurality of aminoes existing in the polyamide-amine dendritic compound, restoring by adopting a reducing agent so that the bivalence Co to change into zero valency Co. The preparation method of the invention solves the difficulty that the existing liquid reduction method is unable to prepare the nano-particles of cobalt with small grain size, good dispersancy and simple component, realizes producing the nano-particles ofcobalt of even sphere shape with 4 to 10nm of mean grain size, good dispersancy and 99.5 to 99.9 percent of purity. Besides, the preparation method of the invention has simple preparation method, easy obtained materials, low cost, mild conditions and low demand on requirement, environment friendly process and the side products thereof are non-polluted and is applied to mass industrialized production.

Description

Technical field [0001] The invention relates to a method for preparing nano cobalt particles, and belongs to the technical field of nano metal materials. Background technique [0002] Nano-cobalt particles have many uses as high-performance magnetic recording materials, magnetic fluids, wave-absorbing materials, activation sintering additives, etc. in the electronic industry, magnetism, cemented carbide, surface spraying, chemical catalysis and other industrial fields. [0003] The preparation methods of nano cobalt particles include thermal decomposition method, precipitation-thermal decomposition method, hydrogen reduction method, microemulsion method and so on. The thermal decomposition method uses the expensive and highly toxic cobalt carbonyl as the initial reactant, and the reaction thermal decomposition temperature is above 300 ℃; the precipitation-thermal decomposition method uses expensive high-purity electrolytic cobalt flakes or cobalt pellets, treated with hydrochloric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 杨仕平金磊
Owner SHANGHAI NORMAL UNIVERSITY
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