Method for dispersing detonation method nano-diamond in liquid phase

A nano-diamond and detonation technology, which is applied in the field of nano-diamond preparation, can solve the problems of nano-diamond pollution and nano-diamond agglomeration by detonation method, and achieve the effect of simple process and overcoming product pollution

Inactive Publication Date: 2010-12-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the serious agglomeration of detonation nano-diamonds and the pollution of nano-diamonds in the existing dispersed detonation nano-diamond process.

Method used

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  • Method for dispersing detonation method nano-diamond in liquid phase
  • Method for dispersing detonation method nano-diamond in liquid phase
  • Method for dispersing detonation method nano-diamond in liquid phase

Examples

Experimental program
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Effect test

Embodiment 1

[0029] a. Add 50 mg of detonation nano-diamond powder into 100 mL of deionized water, where the average particle size of the nano-diamond powder is 5 nm, and ultrasonically treat it with an ultrasonic generator to form a detonation nano-diamond suspension.

[0030] b. Use the pulsed laser to bombard the detonation method nano-diamond suspension in step a, the laser focus converges on the liquid surface, and in the micro-area of ​​the liquid surface where the laser beam acts, the amorphous carbon in the nano-diamond aggregate will absorb the laser to generate High temperature and decomposition, the high temperature of amorphous carbon decomposition will break the covalent bonds between nano-diamond particles, so that the agglomerated detonation nano-diamonds will be deagglomerated to form monodisperse diamond nanoparticles. The laser power density in the active area is 10 6 W / cm 2 , the laser action time is 3h, the wavelength of the pulsed laser beam is 1.06μm, the pulse width...

Embodiment 2

[0037]In the same reaction device, the processing conditions not described are all the same as in Example 1. The Nd-YAG solid-state laser outputs a pulsed laser beam with a wavelength of 1.06 μm (pulse width 1.0 ms, pulse frequency 20 Hz), which is focused on the surface of the detonation nano-diamond suspension after being converged by an optical lens. The liquid medium is deionized water, and the detonation method nano-diamond suspension is dispersed by ultrasonic waves to form a uniform detonation method nano-diamond suspension. The container containing the detonation nano-diamond suspension is cooled by an external circulating water bath. After continuous laser bombardment for 1 h, the reacted product was purified by acid washing to obtain gray diamond nanoparticles with an average particle size of 4 nm. see image 3 , is shown as a transmission electron micrograph of dispersed nano-diamond particles obtained by laser bombarding deionized nano-diamond suspension in deion...

Embodiment 3

[0039] In the same reaction device, the processing conditions not described are all the same as in Example 1. Change the pulse frequency of the pulsed laser beam to 10 Hz. The liquid medium is deionized water, and the detonation method nano-diamond suspension is dispersed by ultrasonic waves to form a uniform detonation method nano-diamond suspension. The container containing the detonation nano-diamond suspension is cooled by an external circulating water bath. After continuous laser bombardment for 1 h, the reacted product was purified by acid washing to obtain gray diamond nanoparticles with an average particle size of 4 nm.

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Abstract

The invention discloses a method for dispersing a detonation method nano-diamond in a liquid phase. The method comprises the following steps of: a, mixing commercial detonation method nano-diamond powder serving as a raw material into a liquid medium for the ultrasonic processing to form a suspension; b, bombarding the suspension by using a pulse laser with a laser power density of 106W / cm<2> in the action area for 1 to 3h to obtain stable suspension with no precipitate; and c, oxidizing the product which is subjected to the laser bombardment by using strong acid. The method has the advantages of overcoming the problem of easy product pollution in the conventional process for dispersing the detonation method nano-diamond, and aggregating the aggregated detonation method nano-diamond in multiple kinds of solution to obtain monodisperse nano-diamond particles, along with simple process and safe and controllable laser action process. The method can be widely used in the fields of paint, polymer composites, lubrication and the like.

Description

technical field [0001] The invention relates to a preparation method of nano-diamonds, in particular to a method for dispersing detonation nano-diamonds in a liquid phase to prepare pure nano-diamonds. Background technique [0002] Diamonds exist naturally in meteorites, protoplanetary nebulae, interstellar dust or volcanic ash, and some exist in the form of gem-quality diamonds, which are precious jewelry that people love. In recent years, with the development of nanomaterials science, especially the discovery and application of carbon nanomaterials such as carbon nanotubes, nanoscale diamonds have gradually been recognized and applied as another new type of carbon nanomaterials. Due to its excellent biocompatibility, dimensional stability, electrical insulation, high temperature and high pressure resistance, and chemical stability, nanodiamonds have been used in many fields, such as additives for lubricating oil or polymer composites, and drug carriers. and cell markers. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/06
Inventor 杜希文牛凯阳杨静孙景
Owner TIANJIN UNIV
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