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Method for producing nano diamond particles purified by cerium salt

A nano-diamond and nano-carbon particle technology is applied in the field of cerium salt purification of nano-diamond particles, which can solve the problem of high investment cost, and achieve the effect of broad application prospects and low pollution.

Inactive Publication Date: 2005-06-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The system has obvious advantages, but there are requirements for equipment corrosion resistance, high pressure and high temperature resistance, etc., and the investment cost is high

Method used

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  • Method for producing nano diamond particles purified by cerium salt
  • Method for producing nano diamond particles purified by cerium salt
  • Method for producing nano diamond particles purified by cerium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Add 100 mg of carbon nano-particles after vacuum constant weight into 10 ml of 100 g / ml ammonium cerium sulfate solution, absorb at 30° C. for 24 hours with constant temperature oscillation, and centrifuge to separate nano-diamonds. The nanodiamonds were washed 3 times with 5% (V / V) sulfuric acid solution, and then washed with deionized water until pH≈7. Vacuum drying at 100° C. for 24 hours to obtain nanodiamond particles.

[0015] The particle diameter of the nano-diamond particles prepared by the above-mentioned method adopts transmission electron microscope to measure, and its result is as follows: figure 1 shown. figure 1 The results show that the particle size of nano-diamond particles is 4-6nm.

Embodiment 2

[0016] Example 2: Add 100 mg of carbon nano-particles after vacuum constant weight into 100 ml of 10 g / ml ammonium cerium nitrate solution, absorb at 50° C. for 24 hours with constant temperature oscillation, and centrifuge to separate nano-diamonds. The nano-diamond was washed 3 times with 3% (V / V) sulfuric acid solution, and then washed with deionization to pH ≈ 7. Vacuum drying at 120°C for 12 hours to obtain nanodiamond particles.

[0017] The functional groups on the surface of the nano-diamond particles prepared by the above method are measured by infrared spectroscopy, and the results are as follows: figure 2 shown. figure 2 The results showed that the appearance of carbon nano-particles was black, and the result of infrared spectrum was broad-spectrum absorption. The infrared spectrum of nano-diamond particles purified by nitric acid is slightly different from that of nano-diamond particles purified by cerium salt.

Embodiment 3

[0018] Example 3: Add 100 mg of carbon nano-particles after vacuum constant weight into 20 ml of 40 g / ml ammonium cerium sulfate solution, absorb at 70° C. for 24 hours with constant temperature oscillation, and centrifuge to separate nano-diamonds. The nano-diamonds were washed 5 times with 1% (V / V) sulfuric acid solution, and then deionized to pH ≈ 7. Vacuum drying at 100° C. for 24 hours to obtain nanodiamond particles.

[0019] The functional group on the surface of the nano-diamond particles prepared by the above method adopts X-ray photoelectron energy spectrometer, and the O 1S and C 1S Automatically fit and split peaks to obtain nano-carbon particles (see image 3 , Figure 4 ), nitric acid purification of nano-diamond particles (see Figure 5 , Figure 6 ) and cerium salt purified nano-diamond particles (see Figure 7 , Figure 8 ) of C 1S peak spectrum and O 1S Peak spectrum, such as Figure 3 ~ Figure 8 shown. The XPS analysis results of cerium salt purif...

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Abstract

The invention relates to a method for purifying nano-diamond particles by using cerium salt. The method is to add a certain amount of nano-carbon particles subjected to vacuum constant weight into a certain volume of cerium salt solution, and oscillate and absorb at a constant temperature of 30-70°C for 24-48 hours. , centrifuge the nano-diamonds, wash the nano-diamonds with 1-5% v / v sulfuric acid solution for 3-5 times, then wash them with deionized water until neutral, and dry them under vacuum at 100-120°C for 12-24 hours to obtain nano-diamonds particle. The present invention effectively purifies the nanometer diamond particles by selecting cerium ammonium nitrate or cerium ammonium sulfate.

Description

technical field [0001] The invention relates to a method for purifying nano-diamond particles by using cerium salt. Background technique [0002] Nano-diamond powder synthesized by explosive explosion method is a new variety with a series of special properties, and it is a noteworthy new material with great development potential. The product after detonation synthesis is a black solid, and its main composition is not only diamond powder, but also mixed with nano-graphite and amorphous carbon, as well as a small amount of metal and other impurities. Non-diamond carbon can be removed by strong oxidizing acid treatment to obtain gray nano-diamond powder. The purification of the product after detonation synthesis not only directly affects the final yield, purity, and surface properties of nano-diamond powder, but also affects the cost and application of UFD. It is estimated that the cost of purification usually accounts for more than 60% of the total cost, which is also one of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/08C01B31/06
Inventor 曾汉民安小宁
Owner SUN YAT SEN UNIV
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