A mechanical exfoliation method of functionalized boron nitride nanosheets

A technology of mechanical exfoliation and boron nitride, applied in the direction of chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems of BNNSs low crystallinity, pollution, waste of raw materials, etc., to save experimental raw materials, save energy, and produce The effect of cost reduction

Active Publication Date: 2021-11-23
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low crystallinity of prepared BNNSs, waste of raw materials and easy environmental pollution, the present invention provides an efficient, safe and green synthesis method of BNNSs with high crystallinity

Method used

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  • A mechanical exfoliation method of functionalized boron nitride nanosheets
  • A mechanical exfoliation method of functionalized boron nitride nanosheets
  • A mechanical exfoliation method of functionalized boron nitride nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step (1): 80 g of boric acid and 10 g of commercial hexagonal boron nitride block (Bulk h-BN) were uniformly ground, put into an autoclave, and treated at 220° C. for 12 hours to obtain a hard white solid A. After the sample A was repeatedly washed with deionized water to remove free boric acid, an intermediate product of BO-h-BN was obtained, which was used for performance testing of pretreated samples.

[0032] Step (2): Put the product A obtained in the step (1) into a ball mill jar, and process it for 6 hours at 580 rpm to obtain product B.

[0033] Step (3): The product B obtained in step (2) is washed with deionized water to remove free boric acid components in the liquid to obtain a high-concentration and stable BNNSs dispersion product; or the wet product obtained by centrifugal cleaning is extracted by freezing Dry to obtain the powder product of functionalized BNNSs.

[0034] Step (4): The supernatant obtained by centrifugal washing in step (3) is processed b...

Embodiment 2、3、4、5

[0038] Change the consumption of boric acid and commercial hexagonal boron nitride into 72g and 18g respectively in embodiment 1 step (1); 75g and 12.5g; 80g and 8g; :1; 6:1; 10:1; 12:1). Other operations are the same as in Example 1, and high crystallinity and functionalized BNNSs dispersion products or powder products can also be prepared. High-quality functionalized BNNSs products could also be prepared by further increasing the amount of boric acid added, but the relative yield decreased.

Embodiment 6、7、8、9、10、11、12、13、14、15

[0040] The autoclave treatment temperature in step (1) in Examples 1-5 was changed to 200° C. and 240° C. respectively. Other operations are the same as in Example 1, and high crystallinity and functionalized BNNSs dispersion products or powder products can also be prepared. The temperature above 200 ° C can realize boric acid dehydration and change into corrosive boron oxide. Purpose of etching and fixing commercial blocks of hexagonal boron nitride.

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Abstract

The invention is a mechanical stripping method of functionalized boron nitride nanosheets. The method adopts boric acid and commercial hexagonal boron nitride as raw materials, and synthesizes them through the following three steps: taking boric acid and commercial hexagonal boron nitride in a mortar After uniform mixing, high-temperature pretreatment is carried out, so that the commercial block hexagonal boron nitride is corroded by dehydration boric acid and fixed by boron oxygen, and a uniformly reacted solid mixture is obtained; the solid mixture obtained after the reaction is roughly ground and placed in a ball mill tank In the process, mechanical ball milling is carried out; the white powder obtained after ball milling is dissolved and dispersed in deionized water, and washed repeatedly to ensure that the free boric acid is completely washed away, and the functionalized boron nitride nanosheet dispersion product is obtained; or The product obtained by centrifugal washing is dried to obtain a functionalized boron nitride nanosheet powder product. The method is simple to operate, does not require harsh experimental conditions, boric acid and deionized water can be recycled, and the obtained product has high crystallinity and functionalization degree.

Description

technical field [0001] The invention relates to an efficient mechanical stripping method for preparing functionalized boron nitride nanosheets with abundant functional groups. Background technique [0002] As an important multifunctional two-dimensional material, boron nitride nanosheets (BNNSs) have very similar lattice constants to graphene, and the lattice difference between them is only 2%. In addition, BNNSs has mechanical properties, thermal conductivity, and high specific surface area comparable to graphene, and compared with graphene, BNNSs has higher thermal stability, stronger oxidation resistance, and better corrosion resistance. Excellent properties such as resistance and electrical insulation. Therefore, it has broad application prospects in the fields of ceramics, electronics, petroleum, nuclear industry, aerospace, machinery, polymers, metals, optical glass and cosmetics. Among them, BNNSs is added to the polymer matrix as an inorganic filler to prepare poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064B82Y40/00
CPCB82Y40/00C01B21/0648C01P2004/24C01P2004/62C01P2004/64C01P2006/22
Inventor 薛彦明杨靖文曹超超唐成春
Owner HEBEI UNIV OF TECH
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