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Method for preparing metal nanoparticles

A metal nanoparticle and metal technology, which is applied in the field of metal nanomaterials, can solve the problems that it is difficult to prepare metal nanoparticles with uniform dispersion characteristics, and achieves the effects of low cost of raw materials, low purity of raw materials and fast preparation speed.

Active Publication Date: 2013-09-25
赵远云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the porous self-assembly tendency of the target metal atoms, this method has been difficult to be used to prepare metal nanoparticles with uniform dispersion characteristics.

Method used

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  • Method for preparing metal nanoparticles
  • Method for preparing metal nanoparticles
  • Method for preparing metal nanoparticles

Examples

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Embodiment 1

[0042] This embodiment provides an example of preparing nano-copper particles, and the preparation method includes the following steps:

[0043] (1) The molecular formula of the selected formula is Mg 45 Zn 3 Cu 35 Gd 15 Ca 2 According to the formula, the raw materials are weighed, and after smelting, a solid granular precursor alloy is prepared, and the particle size of the particles is less than 0.25mm. .

[0044] (2) At room temperature, submerge 0.5 g of the precursor alloy fine material prepared in step (1) into 35 mL of aqueous hydrochloric acid solution with a concentration of 0.5 mol / L for dealloying reaction. The frequency is 40KHz. During the reaction process, magnesium, rare earth, calcium, and zinc atoms preferentially react with hydrogen ions to become ions and enter the solution, while copper atoms are dissociated, and the porous self-assembly tendency of the dissociated copper atoms is effectively suppressed under shaking conditions, about 45 Minutes, the...

Embodiment 2

[0051] This embodiment provides an example of preparing nano-nickel particles, and the preparation method includes the following steps:

[0052] (1) The molecular formula of the selected formula is Mg 44 Al 5 Ni 33 Nd 16 Ca 2 According to the formula, the raw material is weighed, and after melting, it is prepared into a solid fine chip precursor alloy, and the thickness of the fine chip is not more than 0.3mm.

[0053] (2) At room temperature, submerge 0.5 g of the precursor alloy fines prepared in step (1) into 90 mL of aqueous hydrochloric acid solution with a concentration of 0.2 mol / L for dealloying reaction. The frequency is 40KHz. During the reaction process, magnesium, aluminum, rare earth, and calcium atoms preferentially react with hydrogen ions to become ions and enter the solution, while nickel atoms are released, and the porous self-assembly tendency of the free nickel atoms is effectively suppressed under shaking conditions, about 60 Minutes, the reaction is...

Embodiment 3

[0057] This embodiment provides an example of preparing mixed nanoparticles of copper and silver, and the preparation method includes the following steps:

[0058] (1) The molecular formula of the selected formula is Mg 47 Cu 18 Ag 18 Gd 15 Ca 2 According to the formula, the raw materials are weighed, and after smelting, a solid granular precursor alloy is prepared, and the particle size of the particles is less than 0.25 mm.

[0059] (2) At room temperature, submerge 0.5 g of the precursor alloy fine material prepared in step (1) into 30 mL of ethanol hydrochloric acid solution with a concentration of 0.5 mol / L for dealloying reaction. The oscillation frequency is 40KHz. During the reaction process, magnesium, rare earth, and calcium atoms preferentially react with hydrogen ions to become ions and enter the solution, while copper atoms and silver atoms are freed. After 45 minutes, the reaction was completed, and uniformly dispersed nano-copper particles and silver parti...

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Abstract

The invention provides a method for preparing metal nanoparticles. By a dealloying method, firstly, precursor alloy solid fine materials containing target metal elements are prepared, secondly, the precursor alloy solid fine materials and acid solution containing hydrogen ions are in dealloying reaction under the condition of violent oscillation, the concentration of the hydrogen ions in the acid solution is controlled in the reaction process, magnesium, rare earth and other relatively active atoms preferentially react with the hydrogen ions and change into ions entering the solution, target metal atoms are freed out, and porous self-assembly and conglobation trend of the target metal atoms is effectively restrained under the condition of violent oscillation, so that uniformly scattered target metal nanoparticles are obtained. Compared with an existing method, the method is low in cost, simple in operation, green, environmentally friendly, high in preparation efficiency, high in by-product value and suitable for large-scale production, and accordingly has a fine application prospect.

Description

technical field [0001] The invention belongs to the technical field of metal nanomaterials, and in particular relates to a preparation method of metal nanoparticle. Background technique [0002] Metal nanoparticles, such as nanoparticles of copper, nickel, cobalt, silver, gold, etc., have special surface effects, quantum size effects, quantum tunneling effects, and Coulomb blocking effects, etc., in optics, electricity, magnetism, and catalysis. It shows many unique properties different from traditional materials, so it is widely used in many fields such as optoelectronic devices, absorbing materials, high-efficiency catalysts, lubricants, conductive pastes, combustion aids and activated sintering materials, and has been widely recognized by people. focus on. [0003] At present, the methods for preparing metal nanoparticles mainly include physical methods and chemical methods. Among them, the physical method mainly includes: 1) physical vapor deposition method: use high-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00
Inventor 赵远云李润伟王新敏常春涛满其奎
Owner 赵远云
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