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Method for preparing modified boron nitride nanosheets by water-phase shearing method

A technology of boron nitride and nanosheets, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problem of increasing the risk and complexity of experiments, destroying the lattice structure of boron nitride, reducing the performance of boron nitride, etc. problems, to achieve the effect of controllable peeling process, simple operation, and improved stability and dispersibility

Inactive Publication Date: 2020-03-27
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

In addition, commonly used methods for preparing hydroxylated boron nitride nanometers include concentrated nitric acid hydrothermal oxidation, molten sodium hydroxide oxidation, high temperature and high pressure hydrothermal oxidation, etc. The required conditions mostly involve high temperature, high pressure, strong acid, strong alkali, strong Oxidants, these conditions increase the risk and complexity of the experiment, which is not conducive to the promotion and expansion of the experiment, and Yi Lin has proved through experiments that the B-N bond at the edge of the BNNS defect has higher reactivity than the intact B-N inside the BNNS ( Lin Y,Williams T V,Xu T B,et al.Aqueous Dispersions of Few-Layered and Monolayered Hexagonal Boron Nitride Nanosheets from Sonication-Assisted Hydrolysis:Critical Role of Water[J].The Journal of Physical Chemistry C,2011,115(6) :2679-2685.)
The cavitation effect brought about by ultrasound will break h-BN, thus producing defects at the edge of the prepared BNNSs, but the breakage effect brought by ultrasound is obviously not as obvious as the shear force, as KaiWu et al. obtained by one-step water-based ball milling Hydroxylated boron nitride nanosheets use the crushing effect of ball milling, but high-intensity non-specific ball milling will destroy the lattice structure on the surface of boron nitride, thereby reducing the performance of boron nitride, so this method is still has some flaws

Method used

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  • Method for preparing modified boron nitride nanosheets by water-phase shearing method
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  • Method for preparing modified boron nitride nanosheets by water-phase shearing method

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Embodiment 1

[0024] Embodiment 1, preparing boron nitride nanosheets;

[0025] First weigh 0.5g of sodium lauryl sulfate and dissolve it in 500ml deionized water, then weigh 10g of h-BN and disperse it into the prepared aqueous solution of sodium lauryl sulfate, the mixture of sodium lauryl sulfate and h-BN The mass ratio is 1:20.

[0026] The shearing homogenizer shears and strips the prepared h-BN suspension, the speed of the shearing homogenizer is 6000r / min, and the shearing stripping time is 14h. Afterwards, the suspension was centrifuged at a speed of 6000 r / min for 10 minutes, and the supernatant was taken to obtain a OH-BNNSs dispersion with a concentration of 0.88 mg / ml. The obtained supernatant was repeatedly filtered, washed, and freeze-dried to obtain OH-BNNSs powder.

[0027] The shear type homogenizer described in the present invention is the FJ300-SH digital display high-speed dispersion homogenizer produced by Shanghai Specimen Model Factory.

Embodiment 2

[0029] The difference from Example 1 is that the surfactant used is dodecyl hydroxypropyl sulfobetaine, and the rest of the process is the same. After shearing and stripping, the concentration of the supernatant is 0.82mg / ml.

Embodiment 3

[0031] The difference from Example 1 is that the surfactant used is polyvinyl alcohol, and the rest of the process is the same. After shearing and stripping, the concentration of the supernatant is 0.93 mg / ml.

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Abstract

The invention discloses a method for preparing modified boron nitride nanosheets by a water-phase shearing method, and belongs to the technical field of preparation of two-dimensional nano materials.Layered h-BN is dispersed into an aqueous solution, a surfactant is added to stably disperse the h-BN, the h-BN is sheared and stripped in a shear type reactor to obtain OH-BNNSs with the layer numbersmaller than 10, and high-speed centrifugation, suction filtration and freeze drying are carried out to obtain OH-BNNSs powder. The prepared OH-BNNSs are few in layer number and high in yield, covalent functionalization occurs in the stripping process, hydroxyl is generated, and the stability and dispersity of the OH-BNNSs in a polar solution are further improved. The method provided by the invention has the advantages of controllable stripping process, high efficiency, simple operation and low cost, and has an industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of two-dimensional nanometer materials, and in particular relates to the application in the field of preparation of two-dimensional nanometer materials by liquid phase shear exfoliation. It specifically involves the preparation of a small number of BNNSs by using h-BN as a raw material through the shear force generated in a shear reactor, and at the same time covalent functionalization to obtain hydroxylated boron nitride OH-BNNSs. Background technique [0002] With the development of science and technology, the demand for miniaturized and lightweight electronic equipment continues to increase, and many challenges have arisen in terms of heat dissipation to avoid overheating of equipment. To solve this problem, inorganic (ceramic) materials such as silicon dioxide (SiO 2 ), alumina (Al 2 o 3 ), boron nitride (BN), silicon carbide (SiC) and aluminum nitride (AlN) have been used as thermal co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064
CPCC01B21/0648C01P2002/85C01P2004/03C01P2004/04
Inventor 毋伟史晓飞尹翔鹭田杰
Owner BEIJING UNIV OF CHEM TECH
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