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Modification method of hexagonal boron nitride and hydroxy modified boron nitride

A hexagonal boron nitride and hydroxyl modification technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of h-BN surface defect density and types are limited, difficult to control, etc., to achieve simple and efficient surface Effects of modification, easy operation, and mild conditions

Active Publication Date: 2017-11-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the density and types of surface defects on h-BN are limited by its preparation method, making it difficult to control

Method used

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  • Modification method of hexagonal boron nitride and hydroxy modified boron nitride
  • Modification method of hexagonal boron nitride and hydroxy modified boron nitride
  • Modification method of hexagonal boron nitride and hydroxy modified boron nitride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation of embodiment 1 hydroxyl modified boron nitride (HO-BN)

[0047] 1) Pretreatment of commodity h-BN powder

[0048] Weigh 2g of commercial h-BN powder into a 250mL round bottom flask, add 80mL of 10% nitric acid solution (65% nitric acid: water = 1:5.5 (v / v)) to it, and put a stirring magnet. Place the round-bottomed flask in an oil bath, start magnetic stirring, heat to 80°C, keep it for 5 hours, and then cool it down to room temperature naturally to obtain a dispersion. Place the dispersion in a high-speed centrifuge (HC-2518), centrifuge the BN particles at a speed of 8000rpm, and rinse with deionized water until the washing liquid is neutral, and the treated product is dried at 50°C with electric blast Dry in the box (GZX-9070MBE) for 24h. FT-IR spectra of BN powder before and after pretreatment as figure 1 as shown, figure 1 is the infrared spectrum of h-BN before and after nitric acid treatment, by figure 1 It can be seen that there is basicall...

Embodiment 2

[0051] The preparation of embodiment 2 hydroxyl modified boron nitride (HO-BN)

[0052] 1) The pretreatment of h-BN powder is the same as in Example 1.

[0053] 2) Preparation of HO-BN

[0054] Weigh 100 mg of h-BN powder treated with nitric acid into a 100 mL round bottom flask, add 50 mL of deionized water, and place it in an ultrasonic disperser to make the powder ultrasonically dispersed. Then 20 μL of formic acid and 1.1 mL of concentrated sulfuric acid were added in turn, and placed in a stirring magnet. The round bottom flask was placed in the cobalt source chamber with an iron stand, magnetic stirring was started, and the radiation was irradiated for 48 hours. The absorbed dose rate was 105.4Gy / min (calibrated with a ferrous sulfate dosimeter), and the total absorbed dose was 303.4kGy. After the irradiation, the round bottom flask was taken out, and after standing for a period of time, the particles were deposited. The upper liquid was poured out, and the precipitat...

Embodiment 3

[0055] The preparation of embodiment 3 epoxy group modified boron nitride (EP-BN)

[0056] 1) The pretreatment of h-BN powder is the same as in Example 1.

[0057] 2) Preparation of HO-BN

[0058] Weigh 100 mg of h-BN powder treated with nitric acid into a 100 mL round bottom flask, add 50 mL of deionized water, and place it in an ultrasonic disperser to make the powder ultrasonically dispersed. Then 20 μL of formic acid and 1.1 mL of concentrated sulfuric acid were added in turn, and placed in a stirring magnet. The round-bottomed flask was fixed in the cobalt source chamber with an iron stand, magnetic stirring was started, and it was irradiated for 18 hours. The absorbed dose rate was 101.3Gy / min (calibrated by ferrous sulfate dosimeter), and the total absorbed dose was 109kGy. After the irradiation, the round bottom flask was taken out, and after standing for a period of time, the particles were deposited. The upper liquid was poured out, and the precipitate was rinsed ...

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Abstract

The invention provides a modification method of hexagonal boron nitride. The method comprises the following steps: hexagonal boron nitride powder is pretreated in nitric acid, in order to obtain boron nitride pretreated with nitric acid; the boron nitride pretreated with nitric acid is dispersed in a mixed aqueous solution of formic acid and sulfuric acid, in order to obtain dispersion liquid; dispersion liquid is treated by gamma ray irradiation, and hydroxy modified boron nitride is obtained. The invention also provides hydroxy modified boron nitride obtained by the modification method of the technical scheme. Firstly, hexagonal boron nitride powder is pretreated in nitric acid, the powder is dispersed in a mixed aqueous solution of formic acid and sulfuric acid, gamma ray is used for carrying out irradiation, and hydroxy modified boron nitride is obtained. The method has mild condition, and is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of hexagonal boron nitride, and in particular relates to a modification method of hexagonal boron nitride and hydroxyl-modified boron nitride. Background technique [0002] Hexagonal boron nitride (h-BN) is an isoelectronic body of graphite, which has a layered structure similar to graphite, and is called "white graphite". In addition to having excellent lubricity, mechanical properties and thermal conductivity similar to graphite, h-BN also has many unique properties, such as good insulation (bandgap width of 5.2-5.8eV), high thermal stability (used in nitrogen atmosphere The temperature can reach 2800℃), and it is not easy to oxidize (oxidation temperature is higher than 800℃), radiation resistance and good biocompatibility (Weng QH, Wang XB, Wang X, et al.Chemical Society Reviews, 2016, 45(14), 3989-4012; Zhi CY, Bando Y, Tang CC, et al. Journal of Materials Chemistry, 2008, 18(33), 3900-3908.). In rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064C08F292/00C08F220/06
CPCC01B21/0648C01P2002/82C01P2002/88C08F292/00C08F220/06
Inventor 葛学武姜志文汪谟贞
Owner UNIV OF SCI & TECH OF CHINA
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