Method for preparing Mg nano particles under carbon source atmosphere

A nanoparticle and atmosphere technology, applied in the field of Mg preparation, can solve the problems of easy aggregation and growth of nanoparticles, Mg content less than 20%, and failure to reach practical applications, etc., achieve important application value, inhibit agglomeration, and have many defects Effect

Inactive Publication Date: 2014-09-10
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Mg particles are very active, and the obtained nanoparticles are easy to aggregate and grow, and are easy to hydrolyze and oxidize.
Therefore, there are few reports on Mg with a particle size below 100nm. The reports have been found in Chem.Mater.19, 6052 (2007) and Chem.Mater.20, 376 (2008). Unfortunately, the Mg particles prepared in these reports Contains a large number of impurities, the actual Mg content is less than 20%, far from the requirements of practical application

Method used

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  • Method for preparing Mg nano particles under carbon source atmosphere
  • Method for preparing Mg nano particles under carbon source atmosphere
  • Method for preparing Mg nano particles under carbon source atmosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 , Synthesized Mg particles with a particle size of 40nm

[0015] (1) Put the Mg block in a plasma arc heating furnace. After vacuuming, introduce Ar gas with a pressure of 360 Torr and acetylene gas with a pressure of 100 Torr, and apply 160A DC arc plasma to obtain Mg nanoparticles.

[0016] (2) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

Embodiment 2

[0017] Example 2 , Synthesized Mg particles with a particle size of 40nm

[0018] (1) Put the Mg block in a plasma arc heating furnace, after vacuuming, introduce Ar gas with a pressure of 360 Torr and acetylene gas with a pressure of 60 Torr, and apply 200A DC arc plasma to obtain Mg nanoparticles.

[0019] (2) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

Embodiment 3

[0020] Example 3 , Synthesized Mg particles with a particle size of 40nm

[0021] (1) Put the Mg block in a plasma arc heating furnace, after vacuuming, introduce Ar gas with a pressure of 360 Torr and acetylene gas with a pressure of 60 Torr, and apply 120A DC arc plasma to obtain Mg nanoparticles.

[0022] (2) Stop heating and vacuumize. After the system cools down, slowly pass air into the furnace for passivation, and take out the sample after 48 hours of passivation.

[0023] figure 1 It is the XRD (X-ray powder diffraction) pattern of the product Mg nanoparticles of the above experiment, and it can be clearly seen that the prepared Mg has a high purity.

[0024] figure 2 It is a TEM (transmission electron microscope) picture of the above-mentioned experimental product Mg nanoparticles, and it can be seen that the size of the Mg nanoparticles is about 40nm.

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Abstract

The invention discloses a method for preparing Mg nano particles under a carbon source atmosphere. An Mg block is heated to evaporate through an electric arc under the mixed atmosphere of an inert gas and a carbon source gas, the Mg steam is separated from a heating area, nucleated and condensed to form Mg nano particles, and the Mg nano particles are passivated to form nano Mg particles in a particle diameter distribution range of 20 to 50 nanometers. The carbon source gas is decomposed under the action of arc plasma in the method, and the generated carbon is covered on the surface of the magnesium particles to inhibit the generation of magnesium oxide and inhibit the agglomeration of the magnesium particles, and meanwhile, the shape and the structure of the magnesium nano particles can be controlled by adjusting the content of the carbon source gas. The method is simple in equipment, high in synthesis speed and low in cost; and the prepared Mg nano particles have high purity and excellent mechanical property in hydrogen absorption and release when being used as a hydrogen storage material.

Description

technical field [0001] The invention relates to the field of metal preparation and the field of hydrogen storage technology, especially the preparation method and application of Mg with particle size less than 100nm. Background technique [0002] Energy issues, environmental issues and traffic issues are the three major issues facing the development of human society, and they are also the three major problems that my country needs to solve in building a sustainable society. Among them, the energy problem is the most important, the most urgent, and the most difficult to solve. Traditional fossil fuels have pollution problems such as carbon dioxide and other pollution, and their reserves are limited. The energy density of hydrogen energy is very high, the calorific value is three times that of gasoline, and it is clean and pollution-free. It is the most ideal clean secondary energy for human beings, and it is very hopeful that it will be widely used in the 21st century. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/28B22F1/00
Inventor 张旋洲杨鋆智杨容郑捷田文怀李星国
Owner PEKING UNIV
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