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Method for preparing hexagonal boron nitride nanometer layer sheet

A hexagonal boron nitride and nano-layer technology, which is applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems of unfavorable long-term storage and easy slow aggregation, and achieve the effect of avoiding layer aggregation and sedimentation process

Inactive Publication Date: 2017-05-31
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since they are all carried out in the liquid phase, the prepared nanosheets exist in the form of dispersion liquid, while the hexagonal boron nitride nanosheets tend to slowly aggregate and settle in the liquid phase, forming micron or even millimeter-scale aggregates, which is not conducive to long-term growth. time saving

Method used

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  • Method for preparing hexagonal boron nitride nanometer layer sheet
  • Method for preparing hexagonal boron nitride nanometer layer sheet
  • Method for preparing hexagonal boron nitride nanometer layer sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0037] At an ambient temperature of 25°C, put 30mg of sodium cholate and 30mg of hexagonal boron nitride raw materials into a grinding jar with a volume of 45ml, then add 7 grinding balls with a diameter of 10mm, tighten the lid of the jar, and grind at a speed of 300rpm Grind for 0.5 hours. Grinding was stopped for 5 minutes to prevent temperature rise of the grind. After continuing to grind for 0.5 hour, the grinding powder is taken out to obtain the exfoliated hexagonal boron nitride nanosheet. The stripped hexagonal boron nitride nanosheets can be stored for a long time because no solvent is introduced, and can be taken and used at any time. The exfoliated hexagonal boron nitride nanosheets can be dispersed in water by shaking gently. The dispersion liquid is centrifuged under the centrifugal force of 1024g for 0.5 hour, and the nanosheets with larger thickness and size can be removed, so as to obtain hexagonal boron nitride nanosheets with narrow dimension distribution....

Embodiment 2

[0041] At an ambient temperature of 20°C, on the basis of Example 1, this example increases the amount of feed by 20 times, and the specific implementation is as follows: 1200mg sodium cholate and 600mg hexagonal boron nitride raw materials are placed in a grinding tank with a volume of 45ml , then add 7 grinding balls with a diameter of 10 mm, tighten the jar lid, and grind at a speed of 300 rpm for 0.5 hour, then stop grinding for 5 minutes to prevent the temperature of the ground material from rising. Repeat the above grinding (0.5 hour), stop (5 minutes) process until the grinding time reaches 6 hours. The grinding powder is taken out to obtain the exfoliated hexagonal boron nitride nanosheets. The stripped hexagonal boron nitride nanosheets can be stored for a long time because no solvent is introduced, and can be taken and used at any time. The exfoliated hexagonal boron nitride nanosheets can be dispersed in water by shaking gently. The dispersion liquid is centrifuge...

Embodiment 3

[0044] At an ambient temperature of 25°C, 30 mg of sodium dodecylbenzenesulfonate and 60 mg of hexagonal boron nitride raw materials are placed in a grinding tank with a volume of 45 ml, then 6 grinding balls with a diameter of 16 mm are added, and the tank cover is tightened. Grind at 400 rpm for 0.5 hour. Grinding was stopped for 5 minutes to prevent temperature rise of the grind. Repeat the process of grinding (0.5 hour) and stopping (5 minutes) until the grinding reaches 10 hours, then take out the grinding powder to obtain the exfoliated hexagonal boron nitride nanosheet. The stripped hexagonal boron nitride nanosheets can be stored for a long time because no solvent is introduced, and can be taken and used at any time. The exfoliated hexagonal boron nitride nanosheets can be dispersed in water by shaking gently. The dispersion liquid is centrifuged under the centrifugal force of 5000g for 1 hour, and the nanosheets with larger thickness and size can be removed, so as t...

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Abstract

The invention provides a method for preparing a hexagonal boron nitride nanometer layer sheet. The method comprises the following steps of uniformly mixing hexagonal boron nitride raw materials and exfoliant to obtain a mixture, wherein the exfoliant is selected from sodium cholate and sodium dodecyl benzene sulfonate; under the room temperature condition, the mixture is ground to obtain the hexagonal boron nitride nanometer layer sheet. The method has the advantages that the use of a solvent is avoided; the prepared hexagonal boron nitride nanometer layer sheet can be stored for a long time in a solid-state form; the layer sheet gathering and sedimentation process often occurring in the liquid phase is avoided; the effect of taking upon use is achieved.

Description

technical field [0001] The invention belongs to the field of preparation of nano-layered materials, in particular to a method for preparing hexagonal boron nitride nano-layers. Background technique [0002] Hexagonal boron nitride is called white graphite because of its graphite-like structure. Due to its unique structural characteristics and good lubricity, thermal conductivity, corrosion resistance, low dielectric and insulating properties, it has broad application prospects in optoelectronics, electronics industry, catalysis, energy storage and other fields. However, similar to graphene, the excellent physical and chemical properties of hexagonal boron nitride are closely related to the thickness of its layers. The usual methods for preparing hexagonal boron nitride, such as borax-urea method, hydrothermal synthesis method, chemical vapor deposition method, organic precursor method, etc., mostly obtain micron or even millimeter-sized hexagonal boron nitride aggregates (g...

Claims

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Application Information

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IPC IPC(8): C01B21/064B82Y40/00
Inventor 刘刚刘治田
Owner WUHAN INSTITUTE OF TECHNOLOGY
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