CN113200526B - Method for preparing boron nitride nanosheets by stripping method and boron nitride nanosheets - Google Patents
Method for preparing boron nitride nanosheets by stripping method and boron nitride nanosheets Download PDFInfo
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- 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
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- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
Abstract
The invention provides a method for preparing a boron nitride nano sheet by a stripping method, and a boron nitride nano sheet, and a method for stripping hexagonal boron nitride h-BN into boron nitride nano sheets BNNS by using CPs as a ball grinding agent. Comprising the following steps: (1) h-BN, CPs and agate pellets are added into a ball milling tank and ball milled for 2-24 hours at a speed of 500 rpm. (2) The mixture obtained after ball milling was dispersed in isopropanol and sonicated for 1h. (3) And removing the unpeeled h-BN and CPs by centrifugation to obtain the boron nitride nanosheets. According to the invention, the CPs are subjected to phase transformation by utilizing shearing force and heat generated under the action of ball milling, so that the CPs are transformed into molten liquid from a crystalline state, ion-like liquid is formed, and the liquid is intercalated between h-BN in the form of ion fragments to assist in h-BN stripping to prepare BNNS. The CPs used in the present invention comprise only systems that are capable of undergoing solid-liquid phase inversion under the action of ball milling. The method is simple to operate, low in cost, free of complex and expensive equipment, and beneficial to large-scale production and preparation of BNNS.
Description
Technical Field
The invention belongs to the technical field of two-dimensional material stripping preparation, in particular to a method for preparing boron nitride nanosheets by a stripping method and boron nitride nanosheets, and particularly relates to a method for preparing BNNS by using CPs as a ball mill agent to assist h-BN stripping.
Background
Since graphene was exfoliated from graphite by the mechanical exfoliation method in 2004, two-dimensional materials have attracted considerable attention from researchers due to their special properties. Hexagonal boron nitride (h-BN) is a two-dimensional material having a graphene-like structure, with high thermal conductivity, low density, low thermal expansion, high chemical stability, and excellent electrical insulation. Compared with graphene, the graphene has only covalent bonds connected with C-C bonds, has no polarity, and h-BN has a certain polarity due to the electronegativity difference of B and N atoms, so that partial ionic bonds exist in B-N bonds in the h-BN layer, and stronger van der Waals force interaction exists between the h-BN layers than graphite, so that the h-BN is more difficult to strip than graphite.
Methods for preparing ultra-thin BNs are mainly mechanical stripping (Yang G, zhang X, shang Y, et al Highly thermally conductive polyvinyl alcohol/boron nitride nanocomposites with interconnection oriented boron nitride nanoplatelets [ J ]. Composites Science and Technology,2021, 201:108521.), liquid phase stripping (Deshmukh A R, jeong J W, lee S J, et al Ultrascon-assisted facile green synthesis of hexagonal boron nitride nanosheets and their applications [ J ]. ACS Sustainable Chemistry & Engineering,2019,7 (20): 17114-17125.), chemical vapor deposition (Geng D, zhao X, zhou K, et a1.From Self-Assembly Hierarchical h-BN Patterns to Centimeter Scale Uniform Monolayer h-BN Film [ J ]. Advanced Materials Interfaces,2019,6 (1): 1801493.).
However, the conventional mechanical stripping method has a low yield; the liquid phase stripping needs to use a large amount of solvent for long-time treatment, and common organic solvents are easy to cause environmental pollution; the chemical vapor deposition method has the disadvantages of complex equipment and high manufacturing cost, and is difficult to realize large-scale preparation.
Disclosure of Invention
The invention aims to: in order to overcome the defects of a method for preparing boron nitride nano-sheets on a large scale in the prior art, the invention provides a method for preparing boron nitride nano-sheets by a stripping method and the boron nitride nano-sheets, in particular to a method for promoting coordination polymer CPs to generate solid-liquid phase inversion to assist h-BN stripping by using high-energy ball milling.
The technical scheme is as follows: to achieve the above object, a first object of the present invention is to strip h-BN by a CPs-assisted mechanical ball milling method in which solid-liquid phase inversion is liable to occur, comprising the steps of:
(1) Ball milling stripping: ball milling is carried out on hexagonal boron nitride h-BN, coordination polymer CPs and agate pellets, wherein the CPs are a system which generates solid-liquid phase inversion under the ball milling effect;
(2) Ultrasonic: dispersing the mixture obtained after ball milling in an organic solvent comprising any one of ethanol, isopropanol, N-dimethylformamide and N-methylpyrrolidone, and carrying out ultrasonic treatment;
(3) And (3) collecting: obtaining an organic solvent dispersion liquid of the boron nitride nanosheets through one-time centrifugation; and (3) performing secondary centrifugation to obtain a solid phase, and collecting the dried solid phase to obtain the boron nitride nano-sheet BNNS.
Optionally, in step (2), the CPs include, but are not limited to, [ Zn (HPO) 4 )(H 2 PO 4 )] 2 (imH 2 ) 2 、[M(1，2，4-triazole)(H 2 PO 4 ) 2 ]、ZIF-4、Zn-ZIF-62、Co-ZIF-62、ZIF-76、ZIF-76-mbim、Cu(isopropylimidazolate)、[Zn 3 (H 2 PO 4 ) 6 (H 2 O 3 )]·bimH、[Zn 3 (H 2 PO 4 ) 6 (H 2 O 3 )]·H(2Mebim)、[Zn2(HPO 4 ) 2 (H 2 PO 4 )(5ClbimH) 2 ](H 2 PO 4 )(MeOH)、[Cd 3 (SCN) 2 Br 6 (C 2 H 9 N 2 ) 2 ]、[Cu 2 (SCN) 3 (C 2 bpy)]、[Cu 2 (SCN) 3 (C 4 bpy)]、[Cu 2 (SCN) 12 (Phbpy) 4 ]、[Cu 2 (SCN) 3 (3-Pybpy)]、(1-butyl-4-methylpyridinium)[Cu(SCN) 2 ]At least one of (1), wherein M comprises Zn 2+ ，Cd 2+ ，Cr 2+ ，Mn 2+ Any of im=imidazole, bim=benzimidazole, triazole=triazole, 5-clbim=5-chlorobenzoimidazole, 2 mebim=2-methylbenzimidazole, C 2 bpy=1-ethylbipyridine, C 4 bpy=1-butylbipyridine, phbpy=1-phenylbipyridine, 3-ppy=terpyridine, isopropropylimidozolate=isopropylimidazole, methylpyridinium=picoline, mbim=5-methylbenzimidazole, 1-butyl-4-methylpyridinium=1-butyl-4-picoline.
The CPs are CPs subjected to solid-liquid phase transition after ball milling, and mainly comprise the following types, melting points and glass transition temperatures shown in the following table 1:
TABLE 1 list of CPs for solid-liquid phase transition during ball milling
im=imidazole, bim=benzimidazole, 5-clbim=5-chlorobenzoimidazole, 2 mebim=2-methylbenzimidazole, C 2 bpy=1-ethylbipyridine, C 4 bpy=1-butylbipyridine, phbpy=1-phenylbipyridine, and 3-pybpy=terpyridine.
Optionally, in the step (1), the mass ratio of the hexagonal boron nitride h-BN to the coordination polymer CPs is 1:0.1-0.5.
Optionally, in the step (1), the ball milling speed is 300-600rpm, and the ball milling time is 2-24h.
Optionally, in the step (2), the mixture obtained after ball milling is dispersed in an organic solvent at a concentration of 1-10 mg/ml; the time of the ultrasonic treatment is 1h, and the power of the ultrasonic treatment is 100W.
Optionally, in the step (3), the speed of the primary centrifugation is 1000-3000rpm, and the centrifugation time is 10-30min.
Optionally, in step (3), the speed of the secondary centrifugation is 9000-12000rpm, and the centrifugation time is 10-30min.
On the other hand, the invention also provides a boron nitride nano-sheet, which is prepared according to the method.
Optionally, the lateral dimension of the boron nitride nano-sheet is 3-5 μm, and 30-40% of the boron nitride nano-sheet is 5 μm; the boron nitride nano-sheet is thinner and has the thickness of 1-5nm; the edges of the boron nitride nano sheets are curled, and the boron nitride nano sheets are vertically arranged.
On the other hand, the boron nitride nano-sheet can be used as an inorganic filler, is filled in a polymer, is used for preparing a heat-conducting and electric-insulating polymer, and can be applied to various scenes such as aerospace, 5G base stations, small-sized electronic equipment and the like.
The beneficial effects are that: compared with the traditional ionic liquid stripping method, the method for promoting the solid-liquid phase inversion assisted h-BN stripping of the coordination polymer CPs by utilizing the high-energy ball milling has the advantages that ionic fragments with different sizes are generated by the phase transformation of the coordination polymer, and the multi-stage ionic fragment intercalation and stripping effects are better. In addition, the preparation method is simple and convenient, has higher yield, rich raw materials, low cost and low equipment requirement, and is beneficial to mass production.
Drawings
FIG. 1 is a scanning electron micrograph of the boron nitride nanoplatelets prepared in example 1.
Detailed Description
The invention uses CPs auxiliary mechanical ball milling method which is easy to generate solid-liquid phase inversion to strip h-BN, comprising the following steps:
(1) 500mg of h-BN and 50-250 mg of CPs are firstly put into a ball milling tank, the agate pellets with the total mass of about 50g are put into the ball milling tank, and ball milling is carried out for 2-24 hours at the speed of 500 rpm.
(2) The ball-milled mixture was dispersed in isopropanol at a concentration of 3mg/ml and sonicated for 1h using a sonicator (650W. Times.15%, about 100W).
(3) The sonicated dispersion was centrifuged at 2000rpm for 15min to remove unpeeled boron nitride and CPs.
(4) And centrifuging the supernatant at 9000rpm for 15min, pouring off isopropanol, and drying overnight to obtain the boron nitride nanosheets.
The CPs used in the present invention comprise only systems that are capable of undergoing solid-liquid phase inversion under the action of ball milling. And (3) utilizing shearing force and heat generated under the action of ball milling to enable the CPs to generate phase transition, enabling the CPs to be converted into molten liquid from a crystalline state, forming ion-like liquid, and intercalating the ion fragments among the h-BN to assist the h-BN to strip off so as to prepare the BNNS. The method is simple to operate, low in cost, free of complex and expensive equipment, and beneficial to large-scale production and preparation of BNNS.
The following examples, in which h-BN was stripped by using different CPs-assisted mechanical ball milling methods, are used to illustrate the technical scheme of the present invention, and the present invention can be better understood from the following examples. However, it will be readily understood by those skilled in the art that the specific material ratios, process conditions and results thereof described in the examples are illustrative of the present invention and should not be construed as limiting the invention described in detail in the claims. The compounds in table 1 described above are all CPs that undergo phase transition by shear and heat generated by ball milling, and thus, also conform to the principles of the examples of the present invention.
Example 1
Preparation of phase-transition CPs:
[Zn(HPO 4 )(H 2 PO 4 ) 2 ](imH 2 ) 2 is prepared from the following steps: zinc oxide (81 mg,1 mmol), imidazole (136 mg,2 mmol), ethanol (500. Mu.L), phosphoric acid (205. Mu.L, 3 mmol) were put into a mortar and ground for 10 minutes. The powder obtained was washed three times with ethanol (8000 rpm for 5 min), transferred to vacuum drying overnight at 100 ℃ to obtain a dry pure phase.
Preparing boron nitride nanosheets:
500mg of h-BN and 100mg of [ Zn (HPO) are taken first 4 )(H 2 PO 4 ) 2 ](imH 2 ) 2 Putting into a ball milling tank, putting 3 agate pellets with the diameter of 1.2cm, 15 agate pellets with the diameter of 1cm, 10 agate pellets with the diameter of 8mm and 50 agate pellets with the diameter of 6mm (the total mass of all agate pellets is about 50 g) into the ball milling tank, ball milling for 24 hours at the speed of 500rpm,
the ball-milled mixture was dispersed in isopropanol at a concentration of 3mg/mL and sonicated with an ultrasonic cytobreaker at 100W for 1h.
The sonicated dispersion was centrifuged at 2000rpm for 15min to remove the unpeeled boron nitride nanoplatelets. The supernatant was centrifuged at 9000rpm for 15min and dried overnight to give 34.1% yield of boron nitride nanoplatelets.
FIG. 1 is a scanning electron micrograph of the boron nitride nanoplatelets prepared in this example, from which it can be seen that large and thin boron nitride nanoplatelets are obtained, having a lateral dimension of 3-5 μm and 30-40% of the boron nitride nanoplatelets have a lateral dimension of 5. Mu.m. The edge of the boron nitride nano sheet is curled, and the vertical boron nitride nano sheet exists, and the thickness is 2-5nm. The size and thickness of the peeled boron nitride nanosheets are important indexes for evaluating the boron nitride nanosheets, and the boron nitride nanosheets obtained in the embodiment have larger size and thinner thickness, and are high-quality boron nitride nanosheets. In the embodiment, CPs are utilized to convert from large scale to small scale under the action of ball milling, and are used for assisting in stripping boron nitride, so that the boron nitride nanosheets with large size and thin thickness can be obtained.
Example 2
Preparation of phase-transition CPs:
[Zn(1，2，4-triazole) 2 (H 2 PO 4 ) 2 ]is prepared from the following steps: zinc oxide (81 mg,1 mmol), 1,2,4-triazole (138 mg,2 mmol) and phosphoric acid (85%, 134. Mu.L, 2 mmol) were placed in a ball mill. The mixture was ground at 500rpm for 60 minutes. The resulting powder was washed with methanol and transferred to dryness at 100 ℃ overnight to give a dry pure phase.
Preparing boron nitride nanosheets:
500mg of h-BN and 100mg of Zn (1, 2, 4-triazole) are taken first 2 (H 2 PO 4 ) 2 ]Putting into a ball milling tank, putting 3 agate pellets with the diameter of 1.2cm, 15 agate pellets with the diameter of 1cm, 10 agate pellets with the diameter of 8mm and 50 agate pellets with the diameter of 6mm (the total mass of all agate pellets is about 50 g) into the ball milling tank, ball milling for 24 hours at the speed of 500rpm,
the ball-milled mixture was sonicated with a sonicator at a power of 100W for 1h in 30mL of isopropanol at a concentration of 3mg/mL.
The sonicated dispersion was centrifuged at 2000rpm for 15min to remove the unpeeled boron nitride nanoplatelets. The supernatant was centrifuged at 9000rpm for 15min and dried overnight to give 28.1% yield of boron nitride nanoplatelets.
The results of the boron nitride nanoplatelets obtained in this example are the same as those obtained in example 1, with a lateral dimension of 3-5 μm and a lateral dimension of 5 μm for about 30-40% of the boron nitride nanoplatelets. The edge of the boron nitride nano sheet is curled, and the vertical boron nitride nano sheet exists, and the thickness is 1-3nm.
Example 3
Preparation of phase-transition CPs:
preparation of ZIF-4: 1.2g of zinc nitrate hexahydrate, 0.9g of imidazole and 90ml of N, N-dimethylformamide are taken and put into a 100ml reaction kettle to react for 72 hours at 100 ℃, after natural cooling, the mixture is washed three times by the N, N-dimethylformamide and dichloromethane respectively, and the mixture is transferred to be dried at 100 ℃ overnight to obtain a dry pure phase.
Preparing boron nitride nanosheets:
firstly, 500mg of h-BN and 100mg of ZIF-4 obtained are put into a ball milling tank, 3 agate balls with the diameter of 1.2cm, 15 agate balls with the diameter of 1cm, 10 agate balls with the diameter of 8mm and 50 agate balls with the diameter of 6mm (the total mass of all agate balls is about 50 g) are put into the ball milling tank, ball milling is carried out for 24 hours at the speed of 500rpm,
the ball-milled mixture was sonicated with a sonicator at a power of 100W for 1h in 30mL isopropanol at a concentration of 3mg/mL.
The sonicated dispersion was centrifuged at 2000rpm for 15min to remove the unpeeled boron nitride nanoplatelets. The supernatant was centrifuged at 9000rpm for 15min and dried overnight to give 12.1% yield of boron nitride nanoplatelets.
The results of the boron nitride nanoplatelets obtained in this example are the same as those obtained in example 1, with a lateral dimension of 3-5 μm and a lateral dimension of 5 μm for about 30-40% of the boron nitride nanoplatelets. The edge of the boron nitride nano sheet is curled, the vertical boron nitride nano sheet exists, and the thickness is about 2-5nm.
Comparative example 1
Preparing boron nitride nanosheets:
firstly, 500mg of h-BN and 100mg of urea are put into a ball milling tank, 3 agate pellets with the diameter of 1.2cm, 15 agate pellets with the diameter of 1cm, 10 agate pellets with the diameter of 8mm and 50 agate pellets with the diameter of 6mm (the total mass of all agate pellets is about 50 g) are put into the ball milling tank, ball milling is carried out for 24 hours at the speed of 500rpm,
the ball-milled mixture was sonicated with a sonicator at a power of 100W for 1h in 30mL isopropanol at a concentration of 3mg/mL.
The sonicated dispersion was centrifuged at 2000rpm for 15min to remove the unpeeled boron nitride nanoplatelets. The supernatant was centrifuged at 9000rpm for 15min and dried overnight to give 11.3% yield of boron nitride nanoplatelets.
As a result of the boron nitride nanosheets obtained in this comparative example, the lateral dimensions were 3 to 5. Mu.m, and about 20 to 30% of the boron nitride nanosheets had lateral dimensions of 5. Mu.m. The edge of the boron nitride nano sheet is curled, and the vertical boron nitride nano sheet exists, and the thickness is 5-10nm.
Comparative example 2
Preparing boron nitride nanosheets:
100mg of h-BN and 30ml of isopropanol were placed in a centrifuge tube, and sonicated with an ultrasonic cytobreaker at 100W for 1 hour.
The sonicated dispersion was centrifuged at 2000rpm for 15min to remove the unpeeled boron nitride nanoplatelets. The supernatant was centrifuged at 9000rpm for 15min and dried overnight to give 0.2% yield of boron nitride nanoplatelets.
The result of the boron nitride nanosheets obtained in this comparative example was not different from the original boron nitride, and the lateral dimensions were 30 to 50. Mu.m, and the boron nitride nanosheets were very thick and had a thickness of 1 to 2. Mu.m.
Comparative example 3
Preparing boron nitride nanosheets:
100mg of h-BN and 30ml of isopropanol were placed in a centrifuge tube, and sonicated with an ultrasonic cytobreaker at 100W for 24 hours.
The sonicated dispersion was centrifuged at 2000rpm for 15min to remove the unpeeled boron nitride nanoplatelets. The supernatant was centrifuged at 9000rpm for 15min and dried overnight to give 16.3% yield of boron nitride nanoplatelets.
As a result of the boron nitride nanosheets obtained in this comparative example, the lateral dimensions were 1 to 3. Mu.m, and about 20 to 30% of the boron nitride nanosheets had lateral dimensions of 3. Mu.m. The edge of the boron nitride nano sheet is curled, and the vertical boron nitride nano sheet exists, and the thickness is 1-10nm.
Example results and analysis
Table 2 comparison of yield and CPs melting point of boron nitride nanoplatelets obtained in examples and comparative examples
From a combination of the experimental results of examples 1-3 and comparative examples 1-3 above, it can be seen that the use of CPs ball milling to assist in h-BN stripping is also more efficient than the use of isopropanol ultrasonics and urea ball milling, especially much more efficient than the use of pure isopropanol ultrasonics, and the results of comparative example 3 demonstrate that pure isopropanol ultrasonics only marginally achieves the minimum level of the examples of the present invention after 24 hours, which undoubtedly shortens the time and improves the production yield. Examples 1-3 using the process of the present invention gave improved stripping yields and effects compared to comparative example 1 using urea ball milling, especially for examples 1,2 [ Zn (HPO) 4 )(H 2 PO 4 ) 2 ](imH 2 ) 2 And [ Zn (1, 2, 4-triazole) 2 (H 2 PO 4 ) 2 ]An efficiency improvement of approximately 3 times was obtained as compared to comparative example 1.
The comparison result of the yield fully shows that the invention uses CPs to assist the h-BN peeling, which is more conducive to the h-BN peeling than the conventional isopropanol ultrasonic and urea ball milling, and obtains the boron nitride nano-sheet with higher yield;
meanwhile, by comparing the efficiency of CPs-assisted h-BN peeling with different melting points Tm, the efficiency of CPs-assisted h-BN peeling becomes lower as the melting point increases, and a lower melting point [ Zn (HPO) 4 )(H 2 PO 4 ) 2 ](imH 2 ) 2 The efficiency of the obtained peeling is highest. It was demonstrated that when using low melting CPs ball milling to assist h-BN stripping, the stripping yield was greatly improved.
This phenomenon occurs because the energy generated during ball milling is insufficient to convert the high melting CPs into ion fragments, while the low melting CPs can be converted into a large amount of ion fragments by ball milling to assist h-BN stripping, thereby achieving higher yield.
In addition, the product obtained by the method is a large and thin boron nitride nano sheet, excellent h-BN stripping effect is obtained, and particularly, the method has more obvious progress in the aspects of size distribution breadth and multistage ion fragment intercalation than the method of using isopropanol ultrasonic and urea ball milling stripping. Significant advances were made in both lateral dimensions and thickness, particularly with a lateral dimension of 3-5 μm and a lateral dimension of 5 μm for about 30-40% of the boron nitride nanoplatelets; the edge of the boron nitride nano sheet is curled, the vertical boron nitride nano sheet exists, and the thickness is about 2-5nm. It can be seen that the boron nitride nanoplatelets prepared by the method of the invention obtain a larger proportion of products with large transverse dimensions and have a thinner thickness.
In summary, the invention discloses a method for preparing boron nitride nanosheets by a stripping method, which adopts a ball milling mode to strip lamellar boron nitride, adds coordination polymer as a ball grinding agent, and the selected coordination polymer can undergo phase transition in the ball milling process, shearing and friction heat of ball milling promote the coordination polymer to undergo phase transition from crystal to liquid, and the coordination polymer plays a role similar to ionic liquid stripping two-dimensional materials, but is converted into solid after stopping ball milling. Compared with the traditional ionic liquid stripping, the coordination polymer phase transformation generates ion fragments with different sizes, and the multi-stage ion fragment intercalation and stripping effects are better.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (8)
1. A method for preparing boron nitride nanosheets by a stripping method, the method comprising the steps of:
(1) Ball milling stripping: hexagonal boron nitride h-BN and coordination polymer CPs are mixed according to the mass ratio of 1: ball milling is carried out at 0.1-0.5, CPs is a system which is subjected to solid-liquid phase inversion under the action of ball milling, the ball milling speed is 300-600rpm, and the ball milling time is 2-24 h;
(2) Ultrasonic: dispersing the mixture obtained after ball milling in an organic solvent, and carrying out ultrasonic treatment;
(3) And (3) collecting: obtaining an organic solvent dispersion liquid of the boron nitride nanosheets through one-time centrifugation; performing secondary centrifugation to obtain a solid phase, and collecting the solid phase after drying to obtain boron nitride nano-sheets BNNS;
the CPs include [ Zn (HPO) 4 )(H 2 PO 4 ) ] 2 (imH 2 ) 2 、[M(1,2,4-triazole)(H 2 PO 4 ) 2 ]、ZIF-4、Zn-ZIF-62、Co-ZIF-62、ZIF-76、ZIF-76-mbim、Cu(isopropylimidazolate)、[Zn 3 (H 2 PO 4 ) 6 (H 2 O 3 )]·bimH、[Zn 3 (H 2 PO 4 ) 6 (H 2 O 3 )]·H(2Mebim)、
[Zn 2 (HPO 4 ) 2 (H 2 PO 4 )(5ClbimH) 2 ](H 2 PO 4 )(MeOH)、[Cd 3 (SCN) 2 Br 6 (C 2 H 9 N 2 ) 2 ]、[Cu 2 (SCN) 3 (C 2 bpy)]、[Cu 2 (SCN) 3 (C 4 bpy)]、[Cu 2 (SCN) 12 (Phbpy) 4 ]、[Cu 2 (SCN) 3 (3-Pybpy)]、(1-butyl-4-methylpyridinium)[Cu(SCN) 2 ]At least one of (1), wherein M comprises
Zn 2+ , Cd 2+ ,Cr 2+ ,Mn 2+ Any of im=imidazole, bim=benzimidazole, triazole=triazole, 5-clbim=5-chlorobenzoimidazole, 2 mebim=2-methylbenzimidazole, C 2 bpy=1-ethylbipyridine, C 4 bpy=1-butylbipyridine, phbpy=1-phenylbipyridine, 3-ppy=terpyridine, isopropropylimidozolate=isopropylimidazole, methylpyridinium=picoline, mbim=5-methylbenzimidazole, 1-butyl-4-methylpyridinium=1-butyl-4-picoline.
2. The method for producing boron nitride nanoplatelets according to claim 1, wherein in step (2), the mixture obtained after ball milling is dispersed in an organic solvent at a concentration of 1-10mg/ml, the organic solvent comprising any one of ethanol, isopropanol, N-dimethylformamide, N-methylpyrrolidone.
3. The method for producing boron nitride nanosheets according to claim 1, wherein in step (2), the time of the ultrasonic treatment is 1h, and the power of the ultrasonic treatment is 100W.
4. The method for producing boron nitride nanosheets according to claim 1, wherein in step (3), the speed of the primary centrifugation is 1000 to 3000rpm, and the centrifugation time is 10 to 30min.
5. The method for producing boron nitride nanosheets according to claim 1, wherein in step (3), the secondary centrifugation is performed at 9000 to 12000rpm for 10 to 30 minutes.
6. Boron nitride nanoplatelets, characterized in that they are prepared according to the method of any one of claims 1 to 5.
7. The boron nitride nanoplatelets of claim 6, wherein the boron nitride nanoplatelets have a lateral dimension of 3-5 μm, and 30-40% of the boron nitride nanoplatelets have a lateral dimension of 5 μm; the edges of the boron nitride nano-sheets are curled, and the thickness of the boron nitride nano-sheets is 1-5 nm.
8. Use of the boron nitride nanoplatelets according to claim 6 or 7, characterized in that the boron nitride nanoplatelets as inorganic fillers for the preparation of thermally conductive electrically insulating polymers, including applications in aerospace, 5G base stations, small electronic devices.
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| CN110902661A (en) * | 2019-12-23 | 2020-03-24 | 潍坊春丰新材料科技有限公司 | Nanoscale boron nitride powder for spraying field and manufacturing process thereof |
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