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Method for preparing Mg nano particles under carbon source atmosphere

A nanoparticle and carbon source gas technology, applied in the field of metal preparation, can solve the problems of easy aggregation and growth of nanoparticles, less than 20% Mg content, and inability to achieve practical application, etc., achieves important application value, inhibits agglomeration, Defective effect

Inactive Publication Date: 2011-11-09
PEKING UNIV
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  • Summary
  • 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 , Synthetic Mg particles with a particle size of 40nm

[0015] (1) Put the Mg block in a plasma arc heating furnace, evacuated, pass in 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 evacuate. After the system cools down, air is slowly passed into the furnace for passivation, and the sample is taken out after 48 hours of passivation.

Embodiment 2

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

[0018] (1) Put the Mg block in a plasma arc heating furnace, evacuated, pass in 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 evacuate. After the system cools down, air is slowly passed into the furnace for passivation, and the sample is taken out after 48 hours of passivation.

Embodiment 3

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

[0021] (1) Place the Mg block in a plasma arc heating furnace, and after vacuuming, pass in 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 evacuate. After the system cools down, air is slowly passed into the furnace for passivation, and the sample is taken out after 48 hours of passivation.

[0023] figure 1 The XRD (X-ray powder diffraction) pattern of the product Mg nanoparticles of the above experiment can clearly see that the purity of the prepared Mg is relatively high.

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

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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 technical field of hydrogen storage, in particular to the preparation method and application of Mg with a particle size of less than 100 nm. Background technique [0002] Energy issues, environmental issues, and transportation issues are the three important issues facing the development of human society, as well as the three major problems that my country needs to solve in order to build a sustainable society. Among them, the energy problem is the most important, most urgent, and the most difficult problem to solve. Traditional fossil fuels have pollution problems such as carbon dioxide produced by combustion, 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 mankind, and it is hopeful that it will be widely used in the 21st ...

Claims

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Application Information

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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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