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Preparation of nano cobalt granule

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

Inactive Publication Date: 2008-11-05
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 preparation method of the nano-cobalt particles provided in this embodiment, the specific steps are as follows:

[0032] a) Preparation of template agent: add the third-generation product (3G) of polyamide-amine dendritic polymer with benzene ring as the core into twice distilled water, stir it at 15-30°C to dissolve it completely, and prepare 1mmol / L template solution;

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

[0034] c) Add 10ml of the above-prepared 40mmol / L cobalt chloride solution dropwise to 10ml of the above-prepared 1mmol / L templating agent solution at 15-30°C, and continue stirring for 1-3 hours, wherein: cobalt The molar ratio of salt to templating agent is 40:1;

[0035] d) Add NaBH4 into twice-distilled water at 15-30°C, and now prepare 10ml of 0.16mol / L sodium borohydride solution, quickly add it to the mixed...

Embodiment 2

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

[0041] a) Preparation of template agent: add the third-generation product (3G) of polyamide-amine dendritic polymer with benzene ring as the core into twice distilled water, stir it at 15-30°C to dissolve it completely, and prepare 1mmol / L template solution;

[0042] b) Preparation of cobalt salt solution: add cobalt chloride into double distilled water, stir at 15-30°C to dissolve it completely, and prepare 30mmol / L cobalt chloride solution;

[0043] c) Add 10ml of the above-prepared 30mmol / L cobalt chloride solution dropwise to 10ml of the above-prepared 1mmol / L templating agent solution at 15-30°C, and continue stirring for 1-3 hours, wherein: cobalt The molar ratio of salt to templating agent is 30:1;

[0044] d) At 15-30°C, NaBH 4Add 10ml of 0.12mol / L sodium borohydride solution into double distilled water, quickly add it into the mixed solution...

Embodiment 3

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

[0049] a) Preparation of template agent: add the third-generation product (3G) of polyamide-amine dendritic polymer with benzene ring as the core into twice distilled water, stir it at 15-30°C to dissolve it completely, and prepare 1mmol / L template solution;

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

[0051] c) Add 10ml of the above-prepared 20mmol / L cobalt chloride solution dropwise to 10ml of the above-prepared 1mmol / L template solution at 15-30°C, and continue stirring for 1-3 hours, wherein: Cobalt The molar ratio of salt to templating agent is 20:1;

[0052] d) At 15-30°C, NaBH 4 Add in double distilled water, now prepare 10ml of 0.08mol / L sodium borohydride solution, quickly add to the mixed sol...

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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 of cobalt 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, belonging 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, and activated sintering additives in the electronics industry, magnetism, hard alloys, 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 expensive and highly toxic cobalt carbonyl as the initial reactant, and the thermal decomposition temperature of the reaction is above 300°C; the precipitation-thermal decomposition method uses expensive high-purity electrolytic cobalt flakes or cobalt particles, which are treated with ...

Claims

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Application Information

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