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Preparation method of boron nano-particles

A nanoparticle, butaborane technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as boron nanoparticles that have not yet been seen, and achieve high output, simple production process, The effect of uniform size distribution

Inactive Publication Date: 2013-01-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The Chinese patent with the publication number CN 10155946A discloses a device for preparing silicon nanoparticles by using plasma. The device includes a tubular plasma chamber. One end of the plasma chamber is connected to the inlet pipe, and the other end is connected to the collector. The collector is connected to the vacuum pump. The plasma chamber is covered with a heating jacket for heating the plasma chamber, and the heating jacket is equipped with an excitation device for exciting the plasma, but there is no report on the preparation of boron nanoparticles by the plasma method.

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  • Preparation method of boron nano-particles

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Experimental program
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Effect test

Embodiment 1

[0025] Turn on the vacuum pump, purge the plasma chamber and gas path with nitrogen, and evacuate to reduce the pressure in the plasma system to about 1Pa. Argon (Ar) gas is first introduced into the plasma chamber from the outer tube of the gas inlet pipe at a flow rate of 500 sccm (sccm means 1 cubic centimeter per minute at 0° C. and 1 standard atmospheric pressure). Turn on the radio frequency source, adjust the power to 200W, and generate argon plasma; then pass into the diborane (B 2 h 6 ) gas, the air pressure in the plasma chamber is controlled at 500Pa, and the RF source matching box is adjusted so that the load power and the load power are fully matched. The prepared boron nanoparticles were collected by filter bags.

[0026] figure 1 The transmission electron micrograph (TEM) photo and the diffraction picture of the boron nanopowder collected, the result shows that the average size of the boron nanoparticle is 11nm, and the standard deviation of the size distribu...

Embodiment 2

[0029] Turn on the vacuum pump, purge the plasma chamber and gas path with nitrogen, and evacuate to reduce the pressure in the plasma system to about 1Pa. Helium (He) gas is introduced into the plasma cavity from the outer tube of the intake pipe at a flow rate of 100 sccm. Turn on the radio frequency source, adjust the power to 80W, and generate helium plasma; Then, the tetraborane (B 4 h 10 ) gas, the air pressure in the plasma chamber is controlled at 1200Pa, and the RF source matching box is adjusted so that the load power and the load power are fully matched. The prepared boron nanoparticles were collected by filter bags.

[0030] The prepared nanoparticles can be determined as amorphous boron nanoparticles through transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, plasma mass spectrometry and other analysis methods. The average size of boron nanoparticles is 46nm, and the standard deviation of the size distribution is 18% of its av...

Embodiment 3

[0032] Turn on the vacuum pump, purge the plasma chamber and gas path with nitrogen, and evacuate to reduce the pressure in the plasma system to about 1Pa. Argon gas (Ar) is first introduced into the plasma cavity from the outer pipe of the gas inlet pipe at a flow rate of 3000 sccm. Turn on the radio frequency source, adjust the power to 850W to generate argon plasma; then pass into the diborane (B 2 h 6 ) and hydrogen (H 2 ), wherein diborane (B 2 h 6 ) and hydrogen (H2 ) with a volume ratio of 7:2, and the air pressure in the plasma chamber was controlled at 4000Pa. Adjust the RF source matching box to make the load power fully match the loading power. The prepared boron nanoparticles were collected by filter bags.

[0033] The prepared nanoparticles can be determined as amorphous boron nanopowder particles through transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, plasma mass spectrometry and other analysis methods. The average siz...

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Abstract

The invention discloses a preparation method of boron nano-particles. The preparation method comprises the following steps: letting a mixed gas containing an inert gas and a boron-containing gas source into a plasma chamber, and exciting the mixed gas through using a radio frequency source to decompose the boron-containing gas source to generate the boron nano-particles, wherein the boron nano-particles are separated and collected through taking out of the plasma chamber through a gas flow. The method for preparing the boron nano-particles through utilizing a plasma technology in the invention has the following beneficial effects: 1, the dimension in a range of 1-100nm is adjustable, and the dimension distribution standard deviation is less than 30% of an average dimension; 2, the surfaces of the particles are passivated by hydrogen, and the purities of the boron nano-particles are not less than 99.99wt%; and 3, the production technology is simple, so it is convenient to realize large-scale production.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to the plasma gas phase synthesis and preparation of boron nanoparticles. Background technique [0002] Among all chemical elements, boron has the highest volumetric heat of combustion (140kJ cm -3 ) and the third highest mass heat of combustion (59kJ g -1 , second only to hydrogen and beryllium), which are 3 times and 1.4 times that of hydrocarbon fuels, respectively. However, due to the insufficient combustion and low efficiency caused by the high refractory point of boron (2800K), the application of boron in energetic materials is largely restricted. One of the ways to solve this problem is to greatly increase the specific surface area of ​​the material. For this reason, people try to prepare small-sized boron particles. [0003] Boron particles are considered to be used as boron-rich solid fuels because of their high specific surface area and combustion value, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/02B82Y30/00
Inventor 皮孝东周述杨德仁
Owner ZHEJIANG UNIV
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