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A method for preparing hexagonal boron nitride nanosheets using molten alkali and ultrasonic stripping technology

A technology of hexagonal boron nitride and nanosheets, applied in the field of materials, can solve problems such as low yield

Active Publication Date: 2021-12-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong ionic bonding between layers of hexagonal boron nitride, the yield of h-BNNs prepared by traditional liquid phase exfoliation is actually very low.

Method used

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  • A method for preparing hexagonal boron nitride nanosheets using molten alkali and ultrasonic stripping technology
  • A method for preparing hexagonal boron nitride nanosheets using molten alkali and ultrasonic stripping technology
  • A method for preparing hexagonal boron nitride nanosheets using molten alkali and ultrasonic stripping technology

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preparation example Construction

[0084] Typically, the preparation method comprises the following steps:

[0085] 1) Grinding and stirring sodium hydroxide and potassium hydroxide to form a mixed alkali, and then mixing the mixed alkali and hexagonal boron nitride powder to form a mixture;

[0086] 2) Transfer the prepared mixture to a polytetrafluoroethylene crucible and put it into an autoclave, react at a high temperature for 1-5 hours, and then cool naturally to room temperature;

[0087] 3) Disperse the obtained reactants in deionized water for ultrasonic stripping, then filter the obtained product, wash with deionized water, redisperse in deionized water, and then centrifuge, collect the upper dispersion liquid and dry it to obtain the hexagonal nitriding Boron nanosheets;

[0088] 4) Disperse the centrifugal precipitate obtained in the above steps in deionized water, add sodium hydroxide and potassium hydroxide for ultrasonic stripping, then filter the obtained product, wash with deionized water, redi...

Embodiment 1

[0109] (1) Weigh 2.5g of sodium hydroxide and potassium hydroxide respectively, grind and mix well to form a mixed alkali, and then mix the mixed alkali with 5g of hexagonal boron nitride powder (about 3-18um in particle size).

[0110] (2) The obtained mixture was transferred to a polytetrafluoroethylene crucible and placed in an autoclave, reacted at 180° C. for 1 h, and then cooled naturally to room temperature.

[0111] (3) Disperse the reaction product in the reaction kettle in deionized water, and perform 160W ultrasonic stripping on the obtained mixed solution for 1 hour. The ionic water is washed several times in order to wash away the lye and borate (such as the mixture of sodium borate and potassium borate). After washing the product, redisperse the obtained product in deionized water and then centrifuge (centrifugation speed is 1700 rpm, centrifugation time is 30min), collect the upper layer dispersion liquid and dry (drying treatment temperature is 80°C, treatment ...

Embodiment 2

[0124] With embodiment 1, difference is: the add-on of sodium hydroxide and potassium hydroxide is respectively 3g and 2g in the step (1) and (4).

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Abstract

The invention relates to a method for preparing hexagonal boron nitride nanosheets by using molten alkali and ultrasonic stripping technology. Specifically, the method adopts molten alkali pretreatment technology combined with ultrasonic stripping technology to prepare hexagonal boron nitride nanosheets. The invention also discloses the hexagonal boron nitride nanosheet prepared by the method. The method has the characteristics of simple process, low cost, safety and pollution-free, and can rapidly and efficiently prepare hexagonal boron nitride nanosheets.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing hexagonal boron nitride nanosheets by using molten alkali and ultrasonic stripping technology. Background technique [0002] Two-dimensional layered materials (material thickness between 1nm and 100nm) in nanomaterials have special physical and chemical properties and many potential applications, so more and more people pay attention to them. Among these two-dimensional layered nanomaterials, hexagonal boron nitride nanosheets (h-BNNs) have received extensive attention due to their structural similarity to graphene, and their excellent chemical and thermal stability. Therefore, h-BNNs have better performance than graphene in some fields, such as the preparation of high thermal conductivity ceramic devices, thermal conductivity and insulation composite materials, and recyclable adsorbents. [0003] So far, there are not many methods for preparing h-BNNs, mainly inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/0648C01P2002/82C01P2004/03C01P2004/04C01P2004/60
Inventor 林正得江南傅力王婷代文虞锦洪
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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