Preparation method of porous boron nitride nanofibers

A technology of nanofibers and boron nitride, which is applied in the direction of chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems of inability to obtain nanofibers, high cost, low yield, etc., achieve non-toxic methods, reduce energy consumption and Production cost, effect of high specific surface area

Active Publication Date: 2015-04-22
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a nanofiber with a diameter of less than 100 nanometers in view of the shortcomings of the current preparation technology of porous boron nitride, which has high cost, the need to use toxic raw materials, low yield, and the inability to obtain nanofibers with a high aspect ratio. Green, low-cost, high-yield and high-quality preparation method of porous boron nitride nanofibers

Method used

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  • Preparation method of porous boron nitride nanofibers
  • Preparation method of porous boron nitride nanofibers
  • Preparation method of porous boron nitride nanofibers

Examples

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Embodiment 1

[0029] (1) Dissolve melamine and boric acid in water to obtain a mixed solution of melamine-boric acid-water, the concentration of which is to contain 0.012 grams of melamine and 0.018 grams of boric acid per milliliter of water, then stir for 2 hours and add to a reactor with a reflux device , preheat to 85°C to dissolve and keep it warm for 5 hours; then cool the solution to 25°C at a rate of 1°C per minute, and a white precipitate precipitates, keep the temperature for 8 hours, and filter to obtain a solid precipitate;

[0030] (2) Put the precipitate obtained in step (1) into a 95° C. drying oven and keep it warm for 8 hours to obtain a white solid;

[0031] (3) Add the white solid obtained in step (2) into water, wherein, add 0.006 g of white solid per milliliter of water, then preheat to 85° C. to dissolve it and keep it warm for 2 hours;

[0032](4) Add the solution prepared in step (3) into a spray kettle, spray it into a container equipped with liquid nitrogen, and th...

Embodiment 2、 example 3

[0036] Change the concentration of melamine in step (1) in Example 1 into 0.005 gram and 0.05 gram melamine in every milliliter of water respectively. Other operations are the same as in Example 1, and the product obtained is the same as in Example 1.

Embodiment 4、 example 5

[0038] The concentration of step (1) boric acid in embodiment 1 is changed to contain 0.005 gram, 0.5 gram boric acid respectively in every milliliter of water, and other each operation is all identical with embodiment 1, and the product that obtains is with embodiment 1.

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Abstract

The invention relates to a preparation method of porous boron nitride nanofibers. The preparation method mainly utilizes a three-step synthesis method, namely (1) synthesizing melamine diboronic acid precursor powder from boric acid and melamine in a hydrothermal manner; (2) rapidly freezing and cooling a hot water solution of a melamine diboronic acid precursor with liquid nitrogen by virtue of a freeze-drying method, then drying, and synthesizing melamine diboronic acid nanofibers; and (3) carrying out high-temperature thermal cracking on the melamine diboronic acid nanofibers in protective atmosphere, so as to obtain the porous boron nitride nanofibers. According to the preparation method, molecular crystals of melamine diboronic acid are rapidly separated and nucleated by virtue of a freeze drying technique, so that the growth of the crystals is avoided; the diameters of the prepared porous boron nitride nanofibers reach a nanometer scale, and the porous boron nitride nanofibers are high in purity, uniform in shape, high in slenderness ratio and large in specific surface area.

Description

technical field [0001] The technical solution of the present invention relates to the technical synthesis field of boron nitride nanomaterials, specifically a method for synthesizing porous boron nitride nanofibers. Background technique [0002] The molecular formula of hexagonal boron nitride crystal is BN, which is a graphite-like layered structure material composed of nitrogen (N) atoms and boron (B) atoms. It has excellent electrical insulation, high temperature resistance, oxidation resistance, and chemical resistance. Corrosion and high thermal conductivity are widely used in high-tech fields such as machinery, metallurgy, electronics, and aerospace. [0003] Porous hexagonal boron nitride nanofibers are a class of boron nitride nanofiber materials with a network structure of interpenetrating or closed pores. Porous boron nitride nanofibers combine the advantages of porous boron nitride and nanofibers, not only have a large specific surface area, rich pore structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
Inventor 林靖许璐璐黄阳李杰王伟佳
Owner HEBEI UNIV OF TECH
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