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
CN104528671AActive Publication Date: 2015-04-22HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI UNIV OF TECH
Publication Date
2015-04-22

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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.
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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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