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A Method for Reducing the Size of Nano-Diamonds Based on Catalytic Reaction

A technology of nano-diamond and nano-diamond powder, which is applied in the field of nano-materials, can solve the problems of large particle size of nano-diamond powder and reduction of particle size of nano-diamond powder, so as to reduce size, reduce damage, and reduce reaction temperature. low effect

Active Publication Date: 2021-10-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of large particle size of nano-diamond powder, especially high-temperature and high-pressure synthetic powder, the present invention proposes a method of catalyzing the surface layer of nano-diamond powder with a larger particle size and the coating material, and the subsequent chemical treatment process Removing the reaction product layer on the surface of nano-diamond, thus realizing the purpose of reducing the particle size of nano-diamond powder under high temperature and high pressure

Method used

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  • A Method for Reducing the Size of Nano-Diamonds Based on Catalytic Reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The selected nano-diamond powder with a particle size of about 100nm synthesized by high temperature and high pressure is purified by acid treatment. The specific process is as follows: all processes are carried out in a fume hood, 0.2g nano-diamond powder is added in the conical flask, and then nitric acid (5ml) and sulfuric acid (15ml) with a ratio of 1:3 are measured with a graduated cylinder and added to the conical flask successively. Connect the equipment, pickle for 2 hours, let it stand for cooling, dilute the cooled mixture with deionized water, and evenly distribute it into centrifuge tubes, use a centrifuge for separation treatment, the centrifugal speed is 3000rmp, and take out the centrifuged product Then re-dilute and separate, and operate 2 to 3 times so that the pH value is around 7 and can be dried. Then add the dried sample to the beaker, then add 40ml of deionized water to the beaker to prepare a 5mg / ml concentration of nano-diamond mixture, and magne...

Embodiment 2

[0047] The selected nano-diamond powder with a particle size of about 100nm synthesized by high temperature and high pressure is purified by acid treatment. The specific process is as follows: all processes are carried out in a fume hood, 0.2g nano-diamond powder is added in the conical flask, and then nitric acid (5ml) and sulfuric acid (15ml) with a ratio of 1:3 are measured with a graduated cylinder and added to the conical flask successively. Connect the equipment, pickle for 2 hours, let it stand for cooling, dilute the cooled mixture with deionized water, and evenly distribute it into centrifuge tubes, use a centrifuge for separation treatment, the centrifugal speed is 3000rmp, and take out the centrifuged product Then re-dilute and separate, and operate 2 to 3 times so that the pH value is around 7 and can be dried. Then add the dried sample to the beaker, then add 40ml of deionized water to the beaker to prepare a 5mg / ml concentration of nano-diamond mixture, and magne...

Embodiment 3

[0049] The selected nano-diamond powder with a particle size of about 100nm synthesized by high temperature and high pressure is purified by acid treatment. The specific process is as follows: all processes are carried out in a fume hood, 0.2g nano-diamond powder is added in the conical flask, and then nitric acid (5ml) and sulfuric acid (15ml) with a ratio of 1:3 are measured with a graduated cylinder and added to the conical flask successively. Connect the equipment, pickle for 2 hours, let it stand for cooling, dilute the cooled mixture with deionized water, and evenly distribute it into centrifuge tubes, use a centrifuge for separation treatment, the centrifugal speed is 3000rmp, and take out the centrifuged product Then re-dilute and separate, and operate 2 to 3 times so that the pH value is around 7 and can be dried. Then add the dried sample to the beaker, then add 40ml of deionized water to the beaker to prepare a 5mg / ml concentration of nano-diamond mixture, and magne...

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Abstract

The invention relates to a method for reducing the size of nano-diamond based on catalytic reaction, which belongs to the field of nano-materials. The process steps are: a. Purify and separate the selected artificially synthesized nano-diamond powder by chemical treatment, and then dry it for later use; b. Disperse the purified and dried nano-diamond powder in deionized water, and stir it magnetically to make it It forms a suspension; c. Prepare the metal inclusion precursor solution and add it to the nano-diamond suspension to continue strong magnetic stirring. After fully mixing, add the solution to be reacted dropwise to the mixed solution and continue stirring; d. After the stirring is completed, you will get Move the mixed solution into the reaction kettle, heat and keep it warm for several hours, then take it out after natural cooling, wash and separate the cooling liquid, and dry it in vacuum to obtain the nano-diamond and metal composite powder; e. Heat the composite powder at low temperature for several hours and carry out acid treatment , separated to neutral drying, and finally obtain small particle size nano-diamond material. The fine-grained nano-diamond powder can be better applied in fields such as biomarkers.

Description

technical field [0001] The invention belongs to the field of nanometer materials and provides a method for reducing the particle size of nanometer diamonds. The feature is to coat the surface of nano-diamond powder with a larger particle size, and then catalyze the reaction between the diamond surface and the coating material at a lower heat treatment temperature, and then remove the reaction product layer on the nano-diamond surface through a subsequent chemical treatment process, so as to achieve The purpose of reducing the particle size of the nano-diamond powder is achieved, and the nano-diamond powder with fine grains can be better applied in fields such as biomarkers. Background technique [0002] Nanodiamonds have excellent mechanical and optical properties, high specific surface area, tunable functional surface, non-toxic and low bleaching property, and unique point-defect nitrogen-vacancy luminescent centers (NV), which are very suitable for biomedical imaging, drug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/28B82Y40/00C09K11/65
CPCB82Y40/00C09K11/65C01B32/28
Inventor 魏俊俊荆豆红梁轶凡贾鑫李成明刘金龙陈良贤高旭辉
Owner UNIV OF SCI & TECH BEIJING