Nano-diamond, method of manufacturing the same, and nano-fluid using the same

Patent metadata

Field	Value
Publication number	US-10081546-B2
Application number	US-201514935870-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Sep 1, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

The present invention relates to a nano-diamond, a method of manufacturing the same, and a nano-fluid using the same. The nano-diamond is prepared to comprise functional group represented by the following Chemical Formula 1 that is introduced onto a surface thereof.

First claim

What is claimed is:

1. A method of manufacturing a nano-diamond comprising:
preparing the nano-diamond;
heat-treating the nano-diamond to oxidize a surface thereof; and
introducing a substituent group represented by the following Chemical Formula 1 onto the surface of the nano-diamond having the oxidized surface:

wherein, in Chemical Formula 1, R 1 is hydrogen and R 2 is a substituent group represented by Chemical Formula 2;

wherein, in the Chemical Formula 2, n is any one integer of 1 to 5.

2. The method of claim 1 , wherein in the Chemical Formula 2, n is 2.

3. The method of claim 1 , wherein when the nano-diamond is heat-treated to oxidize the surface, a carboxy group is formed onto the surface of the nano-diamond.

4. is amended as follows: The method of claim 3 , wherein the substituent group represented by the Chemical Formula 1 is introduced onto the oxidized surface of the nano-diamond by steps comprising reacting a carbodiimide-based compound, an amine-based compound, and the carboxy group formed on the nano-diamond having the oxidized surface.

5. The method of claim 4 , wherein the carbodiimide-based compound, the amine-based compound, and the nano-diamond having the oxidized surface is reacted comprising steps of:
introducing an activated ester group onto the surface of the nano-diamond by using the carbodiimide-based compound; and reacting the activated ester group and the amine-based compound.

6. The method of claim 5 , wherein the carbodiimide-based compound is 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC), dicyclohexylcarbodiimide (DCC), or N,N′-diisopropylcarbodiimide (DIC).

7. The method of claim 5 , wherein the amine-based compound is a compound represented by the following Chemical Formula 4:

wherein in the Chemical Formula 4, n is 1 to 5.

8. The method of claim 7 , wherein in the Chemical Formula 4, n is 2.

9. The method of claim 1 , wherein the nano-diamond is heat-treated at a temperature from about 450 to about 600° C.

10. The method of claim 1 , wherein the nano-diamond is heat-treated for about 0.5 to 3 hours.

11. The method of claim 1 , further comprising,
before the heat-treating of the nano-diamond to oxidize the surface, pulverizing the nano-diamond.

12. The method of claim 11 , wherein when the nano-diamond is pulverized, an average particle diameter of the pulverized nano-diamond ranges from about 1 to about 100 nm.

13. The method of claim 11 , wherein the nano-diamond is pulverized using a ball mill, a mortar, a sieve, an attrition mill, a disk mill, a jet mill, a jaw crusher, a crusher, or a combination thereof.

14. The method of claim 11 , wherein the nano-diamond is pulverized under an oxygen or air atmosphere.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Song Kyong Hwa
• Na Sung Wook
• Cha Jinhyeok
• Park Hunwoo
• Lyo In Woong

Classifications

• C09K5/10

  Liquid materials · CPC title

• C01B32/28 Primary

  After-treatment, e.g. purification, irradiation, separation or recovery · CPC title

• C01B31/065 Primary

  Chemistry & Metallurgy · mapped topic