Preparation method of nano-diamond colloid and nano-diamond secondary dispersion method

Abstract

The invention provides a preparation method for nano-diamond colloid and a twice dispersing method for nano-diamond. The twice dispersing method comprises the following steps that nano-diamond raw materials are subjected to acidification treatment and then are dispersed in n-octane for mechanical grinding so as to obtain a clear and transparent black colloidal solution; the obtained colloidal solution is dried so as to obtain a paste with the nano-diamond with the mass percent of 60-70%; and the paste is dissolved in the n-octane so as to obtain the clear and transparent black colloidal solution again, and therefore twice dispersing of the nano-diamond is realized. According to the preparation method for the nano-diamond colloid and the twice dispersing method for nano-diamond, the prepared nano-diamond colloidal solution can be applied to the fields of precise grinding, polishing, composite materials, lubricating oil and the like, meanwhile, twice dispersing of the nano-diamond is realized, and therefore the dispersed nano-diamond is more convenient to transport, and the practicability is high.

Description

technical field

[0001] The invention relates to the technical field of nano-diamond processing, in particular to a preparation method of nano-diamond colloid and a secondary dispersion method of nano-diamond. Background technique

[0002] In addition to inheriting the advantages of diamond, nano-diamond also has the characteristics of nano-materials, has excellent mechanical, thermal, optical, electrical properties, stable chemical properties and good biocompatibility, so it is used in precision grinding and polishing. And lubricating oil and other fields have potential application value. Nano-diamond is formed by the agglomeration of particles with a size of 4-12nm. The average particle size of nano-diamond produced industrially is about 2 μm, and the particle size ranges from several hundred nanometers to more than ten microns. Agglomerates are formed when liquid carbon droplets collide with each other when they are synthesized at high temperature and high pressure under ...

Examples

Embodiment 1

[0034] a. Add 2g of nano-diamond raw material obtained by detonation method (from Hebei Satellite Chemical Co., Ltd.) into a high-temperature reactor, and add 40mL of concentrated HN0 3 React at 200°C for 4 hours. After the reaction, the nano-diamonds are taken out and washed repeatedly with deionized water until neutral to obtain acidified nano-diamonds. X-ray diffraction tests were carried out on nano-diamond raw materials and acidified nano-diamonds respectively, and the results are as follows: figure 1 and figure 2 As shown, it can be seen from the figure that compared with the nano-diamond raw material, the graphite and amorphous carbon content in the acidified nano-diamond is reduced.

[0035] b. Take 400g of ball milling / grinding beads with a diameter of 0.08-0.1mm (the " / " here means "or", the same below) into a ball milling / grinding jar with a volume of 100mL, and then add 0.5g of acidification treatment After the nano-diamond and 50 g n-octane, 0.5 g oleic acid, ...

Embodiment 2

[0039] a. Add the nano-diamond raw material obtained by 2g detonation method into the high-temperature reaction kettle, and add 40mL concentrated HN0 3, reacted at 200°C for 4h, and after the reaction, the nano-diamonds were taken out and washed repeatedly with deionized water until neutral to obtain acidified nano-diamonds.

[0040] b. Take 400g of ball milling / grinding beads with a diameter of 0.08-0.1mm and put them into a ball milling / grinding jar with a volume of 100mL, add 0.5g of acidified nano-diamond, 50g of n-octane, 0.5g of oleic acid, set The rotating speed of the ball mill / mill is 580r / min, the ball mill / grinding time is 4h, and a clear and transparent black colloidal solution is obtained, which is characterized by dynamic light scattering, and the obtained results are as follows Figure 4 Shown in curve a.

[0041] c. Use a rotary evaporator to remove excess n-octane solvent from the obtained clear and transparent nano-diamond black colloid solution, set the tem...

Embodiment 3

[0044] a. Add the nano-diamond raw material obtained by 2g detonation method into the high-temperature reaction kettle, and add 40mL concentrated HN0 3 React at 200°C for 4 hours. After the reaction, the nano-diamonds are taken out and washed repeatedly with deionized water until neutral to obtain acidified nano-diamonds.

[0045] b. Put 400g of ball milling / grinding beads with a diameter of 0.08-0.1mm into a ball milling / grinding jar with a volume of 100mL, add 2.0g of acidified nano-diamond, 50g of n-octane, 2.0g of oleic acid, and set The rotating speed of the ball mill / mill is 580r / min, the ball mill / grinding time is 2h, and a clear and transparent black colloidal solution is obtained, which is characterized by dynamic light scattering, and the obtained results are as follows Figure 5 Shown in curve a.

[0046] c. Use a rotary evaporator to remove excess n-octane solvent from the obtained clear and transparent nano-diamond black colloid solution, set the temperature of t...

technical field

[0001] The invention relates to the technical field of nano-diamond processing, in particular to a preparation method of nano-diamond colloid and a secondary dispersion method of nano-diamond. Background technique

[0002] In addition to inheriting the advantages of diamond, nano-diamond also has the characteristics of nano-materials, has excellent mechanical, thermal, optical, electrical properties, stable chemical properties and good biocompatibility, so it is used in precision grinding and polishing. And lubricating oil and other fields have potential application value. Nano-diamond is formed by the agglomeration of particles with a size of 4-12nm. The average particle size of nano-diamond produced industrially is about 2 μm, and the particle size ranges from several hundred nanometers to more than ten microns. Agglomerates are formed when liquid carbon droplets collide with each other when they are synthesized at high temperature and high pressure under ...

Examples

Embodiment 1

[0034] a. Add 2g of nano-diamond raw material obtained by detonation method (from Hebei Satellite Chemical Co., Ltd.) into a high-temperature reactor, and add 40mL of concentrated HN0 3 React at 200°C for 4 hours. After the reaction, the nano-diamonds are taken out and washed repeatedly with deionized water until neutral to obtain acidified nano-diamonds. X-ray diffraction tests were carried out on nano-diamond raw materials and acidified nano-diamonds respectively, and the results are as follows: figure 1 and figure 2 As shown, it can be seen from the figure that compared with the nano-diamond raw material, the graphite and amorphous carbon content in the acidified nano-diamond is reduced.

[0035] b. Take 400g of ball milling / grinding beads with a diameter of 0.08-0.1mm (the " / " here means "or", the same below) into a ball milling / grinding jar with a volume of 100mL, and then add 0.5g of acidification treatment After the nano-diamond and 50 g n-octane, 0.5 g oleic acid, ...

Embodiment 2

[0039] a. Add the nano-diamond raw material obtained by 2g detonation method into the high-temperature reaction kettle, and add 40mL concentrated HN0 3, reacted at 200°C for 4h, and after the reaction, the nano-diamonds were taken out and washed repeatedly with deionized water until neutral to obtain acidified nano-diamonds.

[0040] b. Take 400g of ball milling / grinding beads with a diameter of 0.08-0.1mm and put them into a ball milling / grinding jar with a volume of 100mL, add 0.5g of acidified nano-diamond, 50g of n-octane, 0.5g of oleic acid, set The rotating speed of the ball mill / mill is 580r / min, the ball mill / grinding time is 4h, and a clear and transparent black colloidal solution is obtained, which is characterized by dynamic light scattering, and the obtained results are as follows Figure 4 Shown in curve a.

[0041] c. Use a rotary evaporator to remove excess n-octane solvent from the obtained clear and transparent nano-diamond black colloid solution, set the tem...

Embodiment 3

[0044] a. Add the nano-diamond raw material obtained by 2g detonation method into the high-temperature reaction kettle, and add 40mL concentrated HN0 3 React at 200°C for 4 hours. After the reaction, the nano-diamonds are taken out and washed repeatedly with deionized water until neutral to obtain acidified nano-diamonds.

[0045] b. Put 400g of ball milling / grinding beads with a diameter of 0.08-0.1mm into a ball milling / grinding jar with a volume of 100mL, add 2.0g of acidified nano-diamond, 50g of n-octane, 2.0g of oleic acid, and set The rotating speed of the ball mill / mill is 580r / min, the ball mill / grinding time is 2h, and a clear and transparent black colloidal solution is obtained, which is characterized by dynamic light scattering, and the obtained results are as follows Figure 5 Shown in curve a.

[0046] c. Use a rotary evaporator to remove excess n-octane solvent from the obtained clear and transparent nano-diamond black colloid solution, set the temperature of t...

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