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Method for modifying boron nitride nanosheet surface with polydopamine

A polydopamine and nanosheet technology, which is applied in the field of new materials, can solve the problems of unfavorable industrial production, storage and application of boron nitride nanosheets, easy agglomeration of boron nitride nanosheets, complicated post-processing process, etc., and achieves difficult agglomeration. Settling, easy operation, long-lasting effect

Inactive Publication Date: 2017-04-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN103626141 A discloses a method of preparing hexagonal boron nitride nanosheets by chemical exfoliation. In the later stage of the reaction, the acid solution needs to be washed repeatedly until the pH is between 6 and 8, and the post-treatment process is relatively cumbersome.
The above methods have prepared boron nitride nanosheets to a certain extent, but the boron nitride nanosheets are prone to agglomeration, and the surface of boron nitride nanosheets has strong inertness and hydrophobicity.
In addition, when boron nitride nanosheets are prepared by mechanical exfoliation, the selected dispersion liquid has a great influence on the exfoliation effect of boron nitride nanosheets, such as water, isopropanol, absolute ethanol, N,N-di Methylformamide, dodecylpyrrolidone, dimethylformamide, N-methylformamide and other single solvents can mechanically exfoliate h-BN to prepare boron nitride nanosheets, but the obtained boron nitride nanosheets Sheets are prone to agglomeration, keep dispersed state for a short time, and low yield, so it is not conducive to large-scale industrial production, storage and application of boron nitride nanosheets

Method used

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  • Method for modifying boron nitride nanosheet surface with polydopamine
  • Method for modifying boron nitride nanosheet surface with polydopamine
  • Method for modifying boron nitride nanosheet surface with polydopamine

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: First, take a certain quality of isopropanol and deionized water, so that the mass ratio of isopropanol and deionized water is 3:2, prepare a mixed solvent of polar organic solvent and water; then, take 3 g of hexagonal nitrogen Add the boron powder into the reaction vessel, then add 300 mL of the mixed solvent of isopropanol-deionized water prepared at a mass ratio of 3:2 into the reaction vessel, mix and stir evenly; finally, the reaction system is ultrasonically The stripping temperature was 20-50°C, and the power was 1350 W, and the reaction was performed for 2 hours first; after the ultrasonic stripping was completed, the mixture was centrifuged at a centrifugal speed of 3000 rpm, and the supernatant was collected for pumping and washing (without Washing with water and ethanol for 2 to 3 times), drying, and finally obtaining hexagonal boron nitride nanosheets. The suction filter membrane is an organic membrane with a pore size of 0.22 μm.

Embodiment 2

[0034]Example 2: First, take a certain mass of N,N-dimethylformamide and deionized water so that the mass ratio of N,N-dimethylformamide and deionized water is 3:2, and prepare a polar organic A mixed solvent of solvent and water; then, take 3 g of hexagonal boron nitride powder and add it to the reaction vessel, and then add 300 mL of N,N-dimethylformaldehyde prepared at a mass ratio of 3:2 to the reaction vessel The mixed solvent of amide-deionized water was mixed and stirred evenly; finally, the reaction system was reacted for 2 hours under the conditions of ultrasonic stripping temperature of 20-50°C and power of 1350 W; after the ultrasonic stripping was completed, the mixed solution was centrifuged Centrifuge at a rate of 3000 rpm, collect the supernatant for pumping, washing (2 to 3 times with deionized water, 2 to 3 times with absolute ethanol), and drying to finally obtain hexagonal boron nitride nanosheets. The suction filter membrane is an organic membrane with a po...

Embodiment 3

[0035] Example 3: First prepare 300 mL of 0.01 mol / L Tris-Cl buffer solution (pH=8.5), take 2 g of boron nitride nanosheets prepared according to the method of Example 1 of the present invention, place them in a beaker, and then pour them into the beaker Add 100 mL of absolute ethanol, then add 300 mL of Tris-Cl buffer solution with a concentration of 0.01 mol / L, stir well, then add 600 mg of dopamine hydrochloride and stir well, and finally put the reaction system at a speed of about 400 rpm Under the condition of magnetic stirring, the reaction was carried out at room temperature for 6 hours. The obtained product was suction filtered, washed (3 to 5 times with deionized water, 3 to 5 times with absolute ethanol), and dried to obtain polydopamine-modified boron nitride nanosheets. membrane.

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Abstract

The invention relates to a method for modifying a boron nitride nanosheet with polydopamine. The invention aims to provide a method of using a mixed solvent of a polar organic solvent and water to conduct ultrasonic stripping of hexagonal boron nitride and modifying a boron nitride nanosheet surface with polydopamine. The boron nitride nanosheet obtained by the method provided by the invention has the characteristics of good dispersibility in the mixed solvent of the polar organic solvent and water, high yield and long storage time. The polydopamine surface modified boron nitride nanosheet prepared by the method has easy storage properties and good dispersibility in a solvent. The method for modifying a boron nitride nanosheet with polydopamine provided by the invention has the advantages of simple operation, safety and low cost, etc.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for modifying the surface of boron nitride nanosheets with polydopamine. [0002] technical background [0003] Boron nitride (BN) has good oxidation resistance, electrical insulation and corrosion resistance, and has various crystal forms such as amorphous, cubic and hexagonal. Among them, hexagonal boron nitride (h-BN) is composed of alternating B and N atoms sp 2 The hexagonal two-dimensional honeycomb lattice structure composed of hybridization, the layered structure is similar to graphite, so the chemical properties are the most stable. Hexagonal boron nitride nanosheets exhibit many excellent properties, such as good mechanical properties (Young's modulus 700-900GPa, fracture strength 120-160GPa, fracture strain 0.28-0.33%), high thermal stability (oxidation resistance temperature ~ 850 ℃) and high thermal conductivity (in-plane thermal conductivity at room ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K9/00C08K7/00C08K3/38
CPCC08K3/38C08K7/00C08K9/00C08K9/04C08K2003/385C08K2201/011
Inventor 王金合施利毅赵迪邹雄毛琳
Owner SHANGHAI UNIV
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