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Chemical method for preparing cobalt nickel nanoscale alloy powder

A technology of nano-alloy powder and cobalt-nickel, which is applied in the field of preparation of cobalt-nickel nano-alloy powder, can solve the problems of complex experimental process, long incubation time, and difficult control of product components, and achieve mild reaction conditions, simple process, and easy preparation low cost effect

Inactive Publication Date: 2012-07-25
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method obtains cobalt-nickel (CoNi) alloy particles with a particle size of 3 to 6 nm, but the particle size cannot be effectively adjusted, and the preparation process requires a long incubation time. The reducing agent sodium borohydride (NaBH) used 4 ) is expensive, which is not conducive to the realization of batch and industrial production of CoNi nano-alloy powder
[0006] According to the report of "Journal of Colloid and Interface Science" 2010, 350, 16-21, CoNi nano-alloy particles were prepared on the surface of highly oriented pyrolytic graphite substrate by vacuum co-evaporation deposition method, which can obtain nano-alloy particles uniformly distributed on the substrate surface particles, but during the evaporation process, metal cobalt (Co) is more likely to appear on the particle surface than nickel (Ni), resulting in a difference between the Co / Ni stoichiometric ratio in the product and the Co / Ni stoichiometric ratio of the reactant, and the product The composition is not easy to control, and the requirements for experimental equipment are high
[0007] According to the report of "Journal of Magnetism and Magnetic Materials" 2011, 323, 2271-2280, CoNi nano-alloy particles are prepared by reducing the precursor with polyols, and cobalt-nickel hydroxide (Co(OH) 2 , Ni(OH) 2 ) precursor, after the precursor is separated, cleaned, and dried, it is reduced with ethylene glycol as a reducing agent at 180 ° C to obtain CoNi nano-alloy particles. This method can obtain CoNi nano-alloy particles with a particle size of 17-25 nm Particles are evenly distributed, but the experimental process is complicated and the reaction time is long, which limits its industrial production

Method used

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  • Chemical method for preparing cobalt nickel nanoscale alloy powder
  • Chemical method for preparing cobalt nickel nanoscale alloy powder
  • Chemical method for preparing cobalt nickel nanoscale alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of reaction solution:

[0030] 1) Preparation of metal salt solution:

[0031] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0032]

[0033]

[0034] 2) Preparation of reducing agent solution:

[0035] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0036]

[0037] 2. Cobalt nanowire preparation:

[0038] ① Heat the solutions prepared by the above method to 90°C respectively;

[0039] ②Add the reducing agent solution dropwise into the metal salt solution;

[0040] ③React for 20 minutes until the reaction is complete;

[0041] ④Centrifugal separation solution and cobalt-nickel nano-alloy powder;

[0042] ⑤ Wash the cobalt-nickel nano-alloy powder 3 times with deionized water, acetone, and absolute ethanol successively;

[0043] ⑥ dry collection.

[0044] The obtained powder is spherical, uniformly distributed, and the average particle size is 187 nm. It looks like ...

Embodiment 2

[0046] 1. Preparation of reaction solution:

[0047] 1) Preparation of metal salt solution:

[0048] Prepare solutions in the following ratios using deionized water as solvent.

[0049]

[0050] 2) Preparation of reducing agent solution:

[0051] Prepare solutions in the following ratios using deionized water as solvent.

[0052]

[0053] 2. Cobalt nanowire preparation:

[0054] ① Heat the solutions prepared by the above method to 90°C respectively;

[0055] ②Add the reducing agent solution dropwise into the metal salt solution;

[0056] ③React for 20 minutes until the reaction is complete;

[0057] ④Centrifugal separation solution and cobalt-nickel nano-alloy powder;

[0058] ⑤ Wash the cobalt-nickel nano-alloy powder 3 times with deionized water, acetone, and absolute ethanol successively;

[0059] ⑥ dry collection.

[0060] The obtained powder is spherical, uniformly distributed, and the average particle size is 380 nm. It looks like figure 2 shown.

Embodiment 3

[0062] 1. Preparation of reaction solution:

[0063] 1) Preparation of metal salt solution:

[0064] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0065]

[0066] 2) Preparation of reducing agent solution:

[0067] Use ethylene glycol as solvent to prepare solutions in the following proportions.

[0068]

[0069] 2. Cobalt nanowire preparation:

[0070] ① Heat the solutions prepared by the above method to 90°C respectively;

[0071] ②Add the reducing agent solution dropwise into the metal salt solution;

[0072] ③React for 20 minutes until the reaction is complete;

[0073] ④Centrifugal separation solution and cobalt-nickel nano-alloy powder;

[0074] ⑤ Wash the cobalt-nickel nano-alloy powder 3 times with deionized water, acetone, and absolute ethanol successively;

[0075] ⑥ dry collection.

[0076] The obtained powder is spherical, uniformly distributed, and the average particle size is 95nm. It looks like image 3 shown...

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Abstract

A chemical method for preparing cobalt nickel nanoscale alloy powder uses hydrazine hydrate as reductants to prepare the cobalt nickel nanoscale alloy powder by a liquid phase reducing method. The method is characterized in that the particle size of the product can be adjusted by means of changing the process factors such as metal salt concentration, the adding quantity of the reductants, addition of surfactants and the like, and the stoichiometric ratio of Co / Ni of the product is controlled by the aid of the stoichiometric ratio of Co / Ni of initial salt, so that components of the CoNi nanoscale alloy powder are controlled. The prepared powder is spherical, the particle size of the prepared powder ranges from 50 nanometers to 700 nanometers, and the prepared powder is evenly distributed and is cobalt nickel mixed alloy powder. The method not only is simple in process and low in raw material cost, but also realizes economical macroscopic preparation, and facilitates practical use of the cobalt nickel nanoscale alloy powder.

Description

technical field [0001] The invention relates to the preparation of nano-powder materials by chemical methods, in particular to the preparation of cobalt-nickel (CoNi) nano-alloy powders. Background technique [0002] Due to their unique physical and chemical properties such as small size effect and surface effect, nanomaterials are widely used in energy materials, ecological environment materials, functional coating materials, high-performance electronic materials and other fields. Cobalt-nickel nanoalloy powder is a kind of magnetic nanoparticle, which has broad application prospects in the fields of microwave absorption, hyperthermia, catalysis, magnetic resonance imaging, drug delivery system, magnetic recording and magnetic sensor. At the same time, the magnetic properties, catalytic properties and microwave absorption properties of cobalt-nickel nano-alloy powders vary with the chemical composition and grain size of the particles. Choosing a certain preparation method ...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 俞宏英孙冬柏卢万恒孟惠民
Owner UNIV OF SCI & TECH BEIJING
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