CN111943150A - Green stripping method for hexagonal boron nitride nanosheets - Google Patents
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052582 BN Inorganic materials 0.000 title claims abstract description 43
- 239000002135 nanosheet Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 41
- 230000005496 eutectics Effects 0.000 claims abstract description 37
- 239000006185 dispersion Substances 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 36
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 29
- 239000001257 hydrogen Substances 0.000 claims description 29
- 239000006228 supernatant Substances 0.000 claims description 22
- 238000003828 vacuum filtration Methods 0.000 claims description 14
- 238000005119 centrifugation Methods 0.000 claims description 10
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 239000001763 2-hydroxyethyl(trimethyl)azanium Substances 0.000 claims description 8
- 235000019743 Choline chloride Nutrition 0.000 claims description 8
- 229960003178 choline chloride Drugs 0.000 claims description 8
- SGMZJAMFUVOLNK-UHFFFAOYSA-M choline chloride Chemical group [Cl-].C[N+](C)(C)CCO SGMZJAMFUVOLNK-UHFFFAOYSA-M 0.000 claims description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- 239000004202 carbamide Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000000374 eutectic mixture Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 claims description 2
- 238000000967 suction filtration Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000011259 mixed solution Substances 0.000 abstract 2
- 239000002244 precipitate Substances 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000001291 vacuum drying Methods 0.000 description 6
- 239000002608 ionic liquid Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical class [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/064—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with boron
- C01B21/0648—After-treatment, e.g. grinding, purification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
Abstract
The invention discloses a method for green stripping of hexagonal boron nitride nanosheets, which comprises the steps of firstly preparing a eutectic solvent, mixing boron nitride with the eutectic solvent, stirring the obtained mixed solution under a magnetic stirrer, then carrying out ultrasonic treatment on the mixed solution to obtain a dispersion liquid, and centrifuging and drying the dispersion liquid to obtain the hexagonal boron nitride nanosheets. The method has the advantages of simple process, low cost, green and nontoxic eutectic solvent, and few defects and complete structure of the obtained hexagonal boron nitride nanosheet.
Description
Technical Field
The invention relates to the field of two-dimensional nano materials, in particular to a method for green stripping of hexagonal boron nitride nanosheets.
Technical Field
Since the successful preparation of graphene in 2004, the layered two-dimensional material attracts much attention due to its unique physicochemical properties, and the hexagonal boron nitride nanosheet, as a new nanomaterial, is a powder which is white, loose, soft and smooth in appearance, and many properties of which are similar to those of graphite, so that it is called "white graphite". Although hexagonal boron nitride has a similar crystal structure to graphene, it has many excellent physical and chemical properties that graphene does not have, such as: high electrical insulation performance, high heat conduction performance, chemical corrosion resistance, excellent dielectric property and the like. The excellent properties also endow the hexagonal boron nitride nanosheet with wide application prospects in various fields of adsorption, hydrogen storage, materials and the like.
The existing methods for preparing hexagonal boron nitride nanosheets include chemical vapor deposition, micromechanical stripping, liquid phase stripping and the like. The preparation method of the hexagonal boron nitride nanosheet is simple, but the general yield is low, and the size and the shape of the obtained hexagonal boron nitride nanosheet are uncontrollable and have certain contingency and limitation. The chemical vapor deposition method has harsh operating conditions, high energy consumption and complex process, so the liquid phase stripping method is considered as the most promising preparation method. The method utilizes the interaction between solvent molecules and the surface of boron nitride and assists long-time ultrasonic stripping to obtain the hexagonal boron nitride nanosheet. However, most of the used solvents are toxic and easily damage the environment, so that a green and environment-friendly solvent is found for preparing the hexagonal boron nitride nanosheet, and the bottleneck problem to be solved in the field is urgently needed.
Eutectic Solvents (DES) are another new class of green solvents with similar characteristics to ionic liquids, also known as ionic liquid analogues. But the eutectic solvent is different from the traditional ionic liquid, and the eutectic solvent also has the excellent characteristics which the ionic liquid does not have, such as low toxicity, even no toxicity, environmental protection, biodegradability and the like. The eutectic solvent is often formed by a Hydrogen Bond Acceptor (HBA) and a Hydrogen Bond Donor (HBD) under certain environment, and ultrasonic stripping of boron nitride by taking the eutectic solvent as a solvent is not reported. Therefore, the method for efficiently producing the hexagonal boron nitride nanosheet with the qualified quality by using the green solvent is the direction for exploration and research of technical personnel.
Disclosure of Invention
The invention aims to provide a method for green stripping of hexagonal boron nitride nanosheets. The preparation method has the characteristics of environmental protection, low price and the like; the obtained hexagonal boron nitride nanosheet has a lamellar structure, a complete crystal structure, high thermal stability and good water dispersibility.
The invention is realized by the following technical scheme:
a green stripping method of hexagonal boron nitride nanosheets comprises the following steps:
(1) preparing a eutectic solvent: the eutectic solvent is heated and melted by a hydrogen bond donor and a hydrogen bond acceptor to obtain a eutectic mixture combined in a hydrogen bond form.
(2) Preparing a first dispersion: adding boron nitride powder into the eutectic solvent, and uniformly stirring to obtain a first dispersion liquid;
(3) carrying out ultrasonic treatment on the first dispersion liquid to obtain a second dispersion liquid;
(4) centrifuging the second dispersion liquid to obtain a supernatant;
(5) and (4) adding a second solvent into the supernatant obtained in the step (4), uniformly stirring, and performing ultrasonic treatment to obtain a third dispersion.
(6) And carrying out suction filtration on the third dispersion liquid, and drying to obtain the hexagonal boron nitride nanosheet.
In the step (1), the hydrogen bond acceptor is choline chloride, and the hydrogen bond donor is one of triethanolamine, glycerol, ethylene glycol and urea.
In the step (1), the molar ratio of the hydrogen bond donor to the hydrogen bond acceptor of the eutectic solvent is 1: 1-7, preferably 1: 2.
the mass-to-volume ratio of the boron nitride to the eutectic solvent in the step (2) is 1 g: 100ml of
And (3) adding the boron nitride powder into the eutectic solvent in the step (2) and stirring at the stirring speed of 800-1000 r/min for 30-60 min.
The ultrasonic treatment in the step (3) is carried out in an ultrasonic cleaning machine, and the power of the ultrasonic is 150W +/-2W; the ultrasonic frequency is 40 +/-2 kHz; the ultrasonic treatment time is 2-10 h.
The rotating speed of the centrifugal machine adopted in the centrifugation in the step (4) is 4000 +/-100 rpm; the centrifugation time is 10-30 min.
In the step (5), the stirring speed is 800-1000 r/min, and the stirring time is 10-20 min. The ultrasonic treatment is carried out in an ultrasonic cleaning machine, and the power of the ultrasonic is 150W +/-2W; the ultrasonic frequency is 40 +/-2 kHz; the ultrasonic treatment time is 30-60 min, and the second solvent is absolute ethyl alcohol.
And (4) performing vacuum filtration by using deionized water to remove impurities in the step (6), and performing vacuum drying on the obtained product at 70 ℃ for 12 hours.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method, the eutectic solvent is taken as a solvent, the eutectic solvent is adsorbed on the surface of boron nitride through ultrasonic dispersion, and the shear force drives the eutectic solvent to move under the action of an external shear force, so that the nano-sheets slide to fall off.
The eutectic solvent adopted by the invention is cheap and easy to obtain, nontoxic and biodegradable, and reduces the pollution to the environment.
The method for stripping the hexagonal boron nitride nanosheets in a green manner is low in cost, simple and easy to control in operation, and the obtained hexagonal boron nitride nanosheets are few in defects and complete in structure.
Drawings
Fig. 1 is a dispersion solution (after standing for one week) of hexagonal boron nitride nanosheets prepared in example 1 in a eutectic solvent.
Fig. 2 is a Scanning Electron Microscope (SEM) photograph of hexagonal boron nitride nanoplates prepared in example 1.
Fig. 3 is a Transmission Electron Microscope (TEM) photograph of hexagonal boron nitride nanosheets prepared in example 1.
FIG. 4 is Transmission Electron Microscope (TEM) photographs of hexagonal boron nitride nanosheets prepared in example 2.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
Example 1
Approximately 9 grams of choline chloride as a hydrogen bond acceptor and triethanolamine as a hydrogen bond donor were mixed in a 1: 2 molar ratio, stirring continuously at 80 ℃ until a transparent and clear liquid is formed, the liquid is a eutectic solution, 0.1 g of hexagonal boron nitride powder is dispersed in the eutectic solution, and stirring is carried out for 1h at 1000rpm/min under a magnetic stirrer. And (2) uniformly stirring to obtain a white dispersion, carrying out ultrasonic treatment on the obtained dispersion with the ultrasonic power of 150W and the ultrasonic time of 10h, standing overnight, centrifuging two thirds of the dispersion, centrifuging for 30min at 4000 rpm, collecting supernatant after centrifugation, adding 50ml of absolute ethyl alcohol into the collected supernatant, putting the supernatant into an ultrasonic cleaning machine for ultrasonic treatment with the power of 150W, stirring the obtained solution with stirring at 1000rpm/min for 10min, carrying out vacuum filtration on the obtained solution, collecting precipitates after vacuum filtration, and drying the precipitates in a vacuum oven at 70 ℃ for 24h to obtain the hexagonal boron nitride nanosheets. To analyze the sample, 1 mg of hexagonal boron nitride nanosheets were dispersed in 10ml of absolute ethanol by 10min ultrasonic dispersion treatment, a few drops of the dispersion were added to a carbon-coated copper mesh, and observed by Transmission Electron Microscopy (TEM).
Example 2
About 10 grams of choline chloride as a hydrogen bond acceptor and triethanolamine as a hydrogen bond donor were mixed in a 1: 1 mol ratio, stirring continuously at 80 ℃ until a transparent and clear liquid is formed, the liquid is eutectic solution, 0.5 g of hexagonal boron nitride powder is dispersed in the eutectic solution, and stirring is carried out for 1h at 1000rpm/min under a magnetic stirrer. And (2) uniformly stirring to obtain a white dispersion, carrying out ultrasonic treatment on the obtained dispersion with the ultrasonic power of 300W for 8h, standing overnight, centrifuging two thirds of the dispersion, centrifuging for 20min at 5000 rpm, collecting supernatant after centrifugation, adding 50ml of absolute ethyl alcohol into the collected supernatant, putting the supernatant into an ultrasonic cleaning machine for ultrasonic treatment with the power of 300W, stirring the obtained solution with stirring at 1000rpm/min for 10min, carrying out vacuum filtration on the obtained solution, collecting the precipitate after vacuum filtration, and drying the precipitate in a vacuum oven at 70 ℃ for 24h to obtain the hexagonal boron nitride nanosheet.
Example 3
Approximately 10 grams of choline chloride as a hydrogen bond acceptor and ethylene glycol as a hydrogen bond donor were mixed in a 1: 2 mol ratio, stirring continuously at 80 ℃ until a transparent and clear liquid is formed, the liquid is eutectic solution, 0.3 g of hexagonal boron nitride powder is dispersed in the eutectic solution, and stirring is carried out for 0.5h at 1000rpm/min under a magnetic stirrer. And (2) uniformly stirring to obtain a white dispersion, carrying out ultrasonic treatment on the obtained dispersion with the ultrasonic power of 400W and the ultrasonic time of 10h, standing overnight, centrifuging two thirds of the dispersion, centrifuging for 30min at 4000 rpm, collecting supernatant after centrifugation, adding 50ml of absolute ethyl alcohol into the collected supernatant, putting the supernatant into an ultrasonic cleaning machine for ultrasonic treatment for 20min with the power of 400W, stirring the obtained solution with the stirring power of 1000rpm/min for 10min, carrying out vacuum filtration on the obtained solution, collecting precipitates after the vacuum filtration, and drying the precipitates in a vacuum oven at 70 ℃ for 24h to obtain the hexagonal boron nitride nanosheets.
Example 4
About 9.9 grams of choline chloride as a hydrogen bond acceptor and glycerol as a hydrogen bond donor, 1: 2 molar ratio, stirring continuously at 80 ℃ until a transparent and clear liquid is formed, the liquid is a eutectic solution, 0.2 g of hexagonal boron nitride powder is dispersed in the eutectic solution, and stirring is carried out for 2 hours at 1000rpm/min under a magnetic stirrer. And (2) uniformly stirring to obtain a white dispersion, carrying out ultrasonic treatment on the obtained dispersion with the ultrasonic power of 300W for 8h, standing overnight, centrifuging two thirds of the dispersion, centrifuging for 10min at 6000 rpm, collecting supernatant after centrifugation, adding 50ml of absolute ethyl alcohol into the collected supernatant, putting the supernatant into an ultrasonic cleaning machine for ultrasonic treatment with the power of 300W, stirring the obtained solution with stirring at 1000rpm/min for 20min, carrying out vacuum filtration on the obtained solution, collecting precipitates after vacuum filtration, and drying the precipitates in a vacuum oven at 70 ℃ for 24h to obtain the hexagonal boron nitride nanosheets.
Example 5
Approximately 9 grams of choline chloride as a hydrogen bond acceptor and urine as a hydrogen bond donor were mixed in a 1: 3 mol ratio, stirring continuously at 80 ℃ until a transparent and clear liquid is formed, the liquid is eutectic solution, 0.4 g of hexagonal boron nitride powder is dispersed in the eutectic solution, and stirring is carried out for 0.5h at 1000rpm/min under a magnetic stirrer. And (2) uniformly stirring to obtain a white dispersion, carrying out ultrasonic treatment on the obtained dispersion with the ultrasonic power of 150W and the ultrasonic time of 6h, standing overnight, centrifuging two thirds of the dispersion, centrifuging for 30min at 5000 rpm, collecting supernatant after centrifugation, adding 50ml of absolute ethyl alcohol into the collected supernatant, putting the supernatant into an ultrasonic cleaning machine for ultrasonic treatment with the power of 150W, stirring the obtained solution with the stirring power of 1000rpm/min for 10min, carrying out vacuum filtration on the obtained solution, collecting precipitates after the vacuum filtration, and drying the precipitates in a vacuum oven at 70 ℃ for 24h to obtain the hexagonal boron nitride nanosheets.
Example 6
Approximately 10 grams of choline chloride as a hydrogen bond acceptor and urea as a hydrogen bond donor were mixed in a 1: 2 molar ratio, stirring continuously at 80 ℃ until a transparent and clear liquid is formed, the liquid is a eutectic solution, 0.3 g of hexagonal boron nitride powder is dispersed in the eutectic solution, and stirring is carried out for 2 hours at 1000rpm/min under a magnetic stirrer. And (2) uniformly stirring to obtain a white dispersion, carrying out ultrasonic treatment on the obtained dispersion with the ultrasonic power of 300W for 12h, standing overnight, centrifuging two thirds of the dispersion, centrifuging for 30min at 6000 rpm, collecting supernatant after centrifugation, adding 50ml of absolute ethyl alcohol into the collected supernatant, putting the supernatant into an ultrasonic cleaning machine for ultrasonic treatment with the power of 300W, stirring the obtained solution with the stirring power of 1000rpm/min for 10min, carrying out vacuum filtration on the obtained solution, collecting precipitates after the vacuum filtration, putting the precipitates into a vacuum oven, and drying the precipitates at 60 ℃ for 48h to obtain the hexagonal boron nitride nanosheets.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (9)
1. A green stripping method of hexagonal boron nitride nanosheets is characterized by comprising the following steps:
(1) preparing a eutectic solvent: the eutectic solvent is heated and melted by a hydrogen bond donor and a hydrogen bond acceptor to obtain a eutectic mixture combined in a hydrogen bond form;
(2) preparing a first dispersion: adding boron nitride powder into the eutectic solvent, and uniformly stirring to obtain a first dispersion liquid;
(3) carrying out ultrasonic treatment on the first dispersion liquid to obtain a second dispersion liquid;
(4) centrifuging the second dispersion liquid to obtain a supernatant;
(5) adding a second solvent into the supernatant obtained in the step (4), uniformly stirring, and performing ultrasonic treatment to obtain a third dispersion;
(6) and carrying out suction filtration on the third dispersion liquid, and drying to obtain the hexagonal boron nitride nanosheet.
2. The method as claimed in claim 1, wherein in step (1), the hydrogen bond acceptor is choline chloride, and the hydrogen bond donor is one of triethanolamine, glycerol, ethylene glycol and urea.
3. The method as claimed in claim 1, wherein in step (1), the molar ratio of hydrogen bond donor to hydrogen bond acceptor in eutectic solvent is 1: 1 to 7.
4. The method as claimed in claim 1, wherein in step (2), the mass-to-volume ratio of boron nitride to eutectic solvent is 1 g: 100 ml.
5. The method as claimed in claim 1, wherein in the step (2), the boron nitride powder is added into the eutectic solvent and stirred at the rotation speed of 800-1000 r/min for 30-60 min.
6. The method as claimed in claim 1, wherein in step (3), the ultrasonic treatment is carried out in an ultrasonic cleaning machine, and the power of the ultrasonic treatment is 150W +/-2W; the ultrasonic frequency is 40 +/-2 kHz; the ultrasonic treatment time is 2-10 h.
7. The method as claimed in claim 1, wherein in the step (4), the rotation speed of a centrifugal machine used for centrifugation is 4000 ± 100 rpm; the centrifugation time is 10-30 min.
8. The method as claimed in claim 1, wherein in step (5), the stirring speed is 800-1000 r/min, and the stirring time is 10-20 min. The ultrasonic treatment is carried out in an ultrasonic cleaning machine, and the power of the ultrasonic is 150W +/-2W; the ultrasonic frequency is 40 +/-2 kHz; the ultrasonic treatment time is 30-60 min, and the second solvent is absolute ethyl alcohol.
9. The method as claimed in claim 1, wherein in step (6), deionized water is used for vacuum filtration to remove impurities, and the obtained product is dried in vacuum at 70 ℃ for 12 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979869A (en) * | 2021-03-01 | 2021-06-18 | 武汉科技大学 | Hexagonal boron nitride nanosheet hydrogel composite material, and preparation method and application thereof |
| CN114805925A (en) * | 2022-04-25 | 2022-07-29 | 西安理工大学 | Preparation method of h-BN/HQ/GO heat-conducting composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979869A (en) * | 2021-03-01 | 2021-06-18 | 武汉科技大学 | Hexagonal boron nitride nanosheet hydrogel composite material, and preparation method and application thereof |
| CN114805925A (en) * | 2022-04-25 | 2022-07-29 | 西安理工大学 | Preparation method of h-BN/HQ/GO heat-conducting composite material |
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