Preparation method of hexagonal boron nitride nanospheres with layered cavitation structure

A technology of hexagonal boron nitride and nanospheres, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of high risk factor, poor uniformity, and large cavitation center volume.

Active Publication Date: 2020-08-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although there are some reports on the synthesis of hollow boron nitride nanospheres, most of them have some problems, such as relatively poor uniformity, the drugs used are explos

Method used

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  • Preparation method of hexagonal boron nitride nanospheres with layered cavitation structure
  • Preparation method of hexagonal boron nitride nanospheres with layered cavitation structure
  • Preparation method of hexagonal boron nitride nanospheres with layered cavitation structure

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Example Embodiment

[0029] Example 1

[0030] (1) Trimethyl borate is used as the boron source and ammonia gas is used as the nitrogen source. Because the trimethyl borate is volatile, the trimethyl borate is carried into the reaction temperature zone by nitrogen bubbling to synthesize hexagonal spherical boron nitride. Firstly, ammonia gas is introduced into the stainless steel tube at a flow rate of 400 mL / min. The first tube furnace is heated to 1000 °C at a rate of 5 °C / min, while the second tube furnace is heated to 500 °C at a rate of 5 °C / min. ℃, after reaching the temperature, continue to scrub for 30 minutes. Then use N with a flow rate of 400 mL / min in the form of nitrogen bubbling 2 The volatile B(OCH 3 ) 3 Brought into the stainless steel pipe and NH 3 The reaction is carried out to obtain the boron nitride nanosphere precursor.

[0031] (2) Place the boron nitride nanosphere precursor obtained in step (1) in the corundum ark, and then put it into the alumina tube, and pass in the flow ra...

Example Embodiment

[0032] Example 2

[0033] The hydrogen-nitrogen mixed gas introduced in step (2) in Example 1 was changed to a hydrogen-argon mixed gas (hydrogen volume 10%), and the other operations were the same as in Example 1, to obtain a secondary treated hydrogen-argon mixed gas Boron nitride nanospheres.

Example Embodiment

[0034] Example 3

[0035] The hydrogen-nitrogen mixed gas introduced in step (2) in Example 1 was changed to nitrogen, and the other operations were the same as those in Example 1, to obtain boron nitride nanospheres with secondary nitrogen treatment.

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Abstract

The invention relates to a preparation method of hexagonal boron nitride nanospheres with a layered cavitation structure. The method takes trimethyl borate as a raw material, and comprises the following two steps: step 1, carrying trimethyl borate into a reaction zone in a nitrogen bubbling manner, reacting trimethyl borate with ammonia gas at a high temperature, and preparing a solid boron nitride nanosphere precursor by a chemical vapor deposition method; and 2, respectively carrying out annealing treatment on the prepared boron nitride nanosphere precursor in different atmospheres such as hydrogen-argon mixed gas, nitrogen and hydrogen-nitrogen mixed gas at a high temperature to obtain the boron nitride nanospheres which can be controlled by subsequent treatment atmospheres and have different layered cavitation structures. The method is simple to operate, safe in experiment and capable of realizing large-batch synthesis, and controllability of the internal cavitation structure of the boron nitride nanosphere is realized.

Description

technical field [0001] The invention relates to a method for preparing hexagonal boron nitride nanospheres with a layered cavitation structure. Background technique [0002] Hexagonal boron nitride (h-BN), which has a layered structure similar to graphene, is usually white powder, commonly known as "white graphite". In the layer is an infinitely extended hexagonal network structure in which N atoms and B atoms are alternately arranged, and the layers are arranged alternately in the form of ABAB, which has high thermal stability, high thermal conductivity, electrical insulation properties, wave transparency, excellent lubrication performance and Excellent physical and chemical properties such as low dielectric constant have broad application prospects in composite materials, luminescent materials, electronic materials, etc. [0003] In recent years, boron nitride nanospheres have attracted widespread attention due to their isotropic properties. Existing studies have shown t...

Claims

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Application Information

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IPC IPC(8): C01B21/064
CPCC01B21/064C01P2002/72C01P2002/78C01P2004/03C01P2004/04C01P2004/34C01P2004/52C01P2004/62
Inventor 唐成春薛彦明刘超泽
Owner HEBEI UNIV OF TECH
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