Preparation method of boron nitride nano tube with controllable dimension

A boron nitride nanotube and size technology, which is applied in nanostructure manufacturing, chemical instruments and methods, nitrogen compounds, etc., can solve the problems of attenuation of preparation efficiency, high preparation cost, equipment corrosion, etc., and achieve shortening of ball milling time and preparation process Simple, responsive effects

Inactive Publication Date: 2010-01-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method cannot change the tube diameter by changing the process and composition, but can only obtain a product with a approximate single tube diameter; and the obtained boron nitride nanotube body is filled with a large amount of magnesium / silicon and its oxides, It brings great difficulties to the subsequent purification; in addition, the system will generate a large amount of gaseous magnesium / silicon during the reaction process and deposit it in the reactor, resulting in a rapid decline in the preparation efficiency, and serious corrosion of the equipment. Materials and containers need to be replaced frequently, so the overall preparation cost is higher

Method used

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  • Preparation method of boron nitride nano tube with controllable dimension
  • Preparation method of boron nitride nano tube with controllable dimension
  • Preparation method of boron nitride nano tube with controllable dimension

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 1) Put the raw materials boron and ferrous chloride in a plastic bottle at a weight ratio of 1:0.02, add zirconia balls and dimethylformamide, raw materials (boron and ferrous chloride), zirconia balls and dimethylformamide The weight ratio of formamide is 1:5:5, ball milled for 8 hours, and after drying, pass through a 100-mesh sieve;

[0020] 2) Put the mixture sieved in step 1) into an alumina porcelain boat and place it in the constant temperature zone of a horizontal tube furnace, feed 50 sccm of argon gas, start to heat up, when the temperature reaches 1000°C, turn off the argon gas and Pass into 100sccm nitrogen, constant temperature 5 hours;

[0021] 3) Close the exhaust port and the air inlet successively at the end of the constant temperature, and cool down to room temperature with the furnace. The product in the porcelain boat is an off-white powder with static electricity. After ultrasonic washing with nitric acid to remove iron-containing impurities, the pr...

Embodiment 2

[0023] 1) Put the raw materials boron and ferrous chloride in a plastic bottle in a weight ratio of 1:0.01, add zirconia balls and dimethylformamide, raw materials (boron and ferrous chloride), zirconia balls and dimethylformamide The weight ratio of formamide is 1:5:5, ball milled for 8 hours, and after drying, pass through a 100-mesh sieve;

[0024] 2) Put the mixture sieved in step 1) into an alumina porcelain boat and place it in the constant temperature zone of a horizontal tube furnace, feed 50 sccm of argon gas, start to heat up, when the temperature reaches 1000°C, turn off the argon gas and Pass into 100sccm nitrogen and 10sccm ammonia gas, constant temperature 2 hours;

[0025] 3) Close the exhaust port and the air inlet successively at the end of the constant temperature, and cool down to room temperature with the furnace. The product in the porcelain boat is an off-white powder with static electricity. After ultrasonic washing with nitric acid to remove iron-contai...

Embodiment 3

[0027] 1) Put the raw materials boron and ferrous sulfate in a plastic bottle at a weight ratio of 1:0.03, add zirconia balls and hexane, the weight ratio of raw materials (boron and ferrous sulfate), zirconia balls and dimethylformamide is 1:5:5, ball mill for 12 hours, after drying, pass through a 100-mesh sieve;

[0028] 2) Put the mixture sieved in step 1) into an alumina porcelain boat and place it in the constant temperature zone of a horizontal tube furnace, feed 50 sccm of argon gas, start to heat up, when the temperature reaches 1150°C, turn off the argon gas and Pass into 100sccm nitrogen and 20sccm ammonia gas, constant temperature 3 hours;

[0029] 3) Close the exhaust port and the air inlet successively at the end of the constant temperature, and cool down to room temperature with the furnace. The product in the porcelain boat is an off-white powder with static electricity. After ultrasonic washing with nitric acid to remove iron-containing impurities, the product...

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Abstract

The invention belongs to the field of inorganic nano material. The prior preparation method of a boron nitride nano tube has the problems of low production rate, high cost, complicated technology, difficult dimension control and the like. The preparation method comprises the steps: putting boron and a catalyst on the basis of weight ratio of 1 to (0.01 to 0.05) into a plastic bottle; using a nonaqueous solvent as a medium; ball-milling the boron and the catalyst for 8 to 24 hours; sieving the boron and the catalyst in a screen of 100 meshes after drying; heating a sieved mixture under the protection of argon gas; stopping leading the argon gas and leading nitrogen gas or the mixed gas of ammonia gas and the nitrogen gas when the temperature reaches 1000 DEG C to 1300 DEG C; keeping the temperature for 0.5 to 5 hours; reducing the temperature to room temperature after the constant temperature is finished; adding an obtained product to nitric acid for ultrasonic processing; removing the remained catalyst; and obtaining the boron nitride nano tube. The preparation method has the advantages of low cost, simple preparation technology, good repeatability and easy control and amplification of reaction; and the obtained boron nitride nano tube has the advantages of high production efficiency, easy purification, controllable tube diameter, controllable length and the like.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, in particular to a method for preparing boron nitride nanotubes. Background technique [0002] Boron nitride nanotubes are rolled up from layered hexagonal boron nitride, which is very similar to carbon nanotubes in structure. Boron nitride nanotubes not only have mechanical properties and thermal conductivity comparable to carbon nanotubes, but also have excellent oxidation resistance, chemical stability and thermal stability. In terms of electrical properties, boron nitride nanotubes behave as wide bandgap semiconductors with stable bandwidth and are not affected by tube diameter and chirality, which is quite different from carbon nanotubes. In addition, since the B-N bond that constitutes boron nitride nanotubes is a polar covalent bond, it is easier to disperse into solvents than carbon nanotubes, so it has better processability. These unique properties make boron nitride nanotu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82B3/00
Inventor 李永利张久兴
Owner BEIJING UNIV OF TECH
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