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Method for preparing boron nitride nanorod by using precursor conversion method

A technology of precursor conversion and boron nitride, applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems of no reports, etc., and achieve the effect of low production cost, high purity and simple process

Active Publication Date: 2011-07-13
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on boron nitride nanorods with a diameter (<50nm) has not been reported at home and abroad.

Method used

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  • Method for preparing boron nitride nanorod by using precursor conversion method
  • Method for preparing boron nitride nanorod by using precursor conversion method
  • Method for preparing boron nitride nanorod by using precursor conversion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Soak the carbon nanotubes in concentrated nitric acid at 60°C for 10 hours, wash them with water and dry them;

[0025] (2) Dissolve polyalkylaminoborazine in xylene to prepare a solution with a concentration of 30% by mass. Immerse the dried carbon nanotubes in the mixed solution for 15 hours by vacuum impregnation, and separate the solid and liquid by suction filtration under reduced pressure;

[0026] (4) Put the solid obtained in step (2) into a vacuum oven and dry at 100°C for 3 hours;

[0027] (5) Put the cooled solid into a high-temperature furnace in dry ammonia at 80°C for 1 hour;

[0028] (6) Raise the temperature to 1000°C at a rate of 300°C / h and keep it warm for 3h to crack the alkylamino borazine and remove carbon elements at the same time to prepare BN nanorods with a diameter of 30-50 nm.

Embodiment 2

[0030] (1) Soak the carbon nanotubes in concentrated nitric acid at 60°C for 15 hours, wash them with water and dry them;

[0031] (2) Dissolve polyalkylaminoborazine in toluene, an organic solvent, and prepare a mass percent concentration of

[0032] Materials, wave-transparent materials, etc., have broad application prospects.

specific Embodiment approach

[0033] The present invention will be further described below in conjunction with embodiment. However, the examples should not be construed as limiting the protection scope of the present invention, and methods equivalent thereto are within the protection scope of the present invention.

[0034] Example 1:

[0035] (1) Synthesize the polyalkylaminoborazine precursor with the following structural formula according to the prior art: (for synthesis see Chinese Chem. Lett. , 21, 1079 (2010), its softening point is about 75℃,

[0036]

[0037] (2) Grind the polyalkylaminoborazine precursor in a glove box under the protection of Ar gas, and sieve it with 1000 mesh; put the sieved precursor powder in a graphite boat, and in a tube furnace, In a high-purity nitrogen atmosphere, heat up to 150°C at a heating rate of 4°C / min, with a nitrogen flow rate of 60ml / min, and keep warm for 1h; then heat up to 600°C at a heating rate of 5°C / min, and keep warm for 2h; Min heating rate, cont...

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Abstract

The invention relates to a method for preparing a boron nitride nanorod by using a precursor conversion method. The method for preparing the boron nitride nanorod comprises the following steps of: soaking a carbon nanotube in concentrated nitric acid at 60 DEG C for 10-24h, washing and drying; dissolving poly(alkylamino) borazine in an organic solvent, and soaking the dried carbon nanotube in a mixed solution; and filtering at a reduced pressure, then carrying out solid-liquid separation, placing solid in a high temperature finance and preserving the temperature for 0.5-5h at 60-200 DEG C in ammonia gas, then heating to 800-1500 DEG C in a heating speed of 60-450DEG C / min, preserving the temperature for 0.5-5h, and removing carbon element while pyrolyzing to obtain the boron nitride nanorod. The prepared boron nitride nanorod has the diameter of 50nm, has the advantages of simple process, no need of catalyst, high purity, low production cost and high efficiency and is easy to realize large-scale production. The prepared boron nitride nanorod can be applied to materials with the functions of hydrogen storage, catalysis, structure reinforcement and high-temperature resistance and has wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing boron nitride nanorods by a precursor conversion method. Background technique [0002] The existing preparation methods of boron nitride nanomaterials mainly include arc discharge method, mechanical ball milling method, inorganic reaction method, template method and electrospinning method. The output of the arc method is very low, and the product forms are various. The mechanical ball milling method takes a long time, usually more than 100 hours, and a large amount of impurities will be introduced during the ball milling process. At the same time, the structure of the product is disordered, and the diameter of the product is not easy to control. Boron nitride nanomaterials prepared by the inorganic reaction method often use a large amount of catalysts, the yield and purity are very low and contain many impurities, which is not conducive to the application of the product in composite materials. The prepa...

Claims

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Application Information

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IPC IPC(8): C01B21/064B82Y40/00
Inventor 王应德雷永鹏
Owner NAT UNIV OF DEFENSE TECH
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