Graphene oxide-nanodiamond composite, manufacturing method thereof, and nanofluid including the same

• US 10,640,692 B2
• Filed: 04/24/2018
• Issued: 05/05/2020
• Est. Priority Date: 02/03/2016
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Song, Kyong Hwa, Kim, Byung Wook, Kwak, Jinwoo, Cha, Jinhyeok, Lyo, In Woong, Lee, Han Saem
• Primary Examiner(s): Stanley, Jane L
• Application Number:
  US15/961,549
• Publication Number:
  US 20180237677A1
• Time in Patent Office: 742 Days
• Field of Search: 252 74
• CPC Class Codes: C01B 32/15 Nano-sized carbon materials
• CPC Class Codes: C01B 32/198 Graphene oxide
• CPC Class Codes: C01B 32/28 After-treatment, e.g. purification, irradiation, separation or recovery
• CPC Class Codes: C07C 45/00 Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
• CPC Class Codes: C07C 51/16 by oxidation C07C51/145 takes precedence
• CPC Class Codes: C09K 5/10 Liquid materials

Abstract

Disclosed herein is a composite comprising a graphene oxide and a nanodiamond that is chemically bonded on a surface of the graphene oxide.

Claims

1. A method of manufacturing a composite comprising a graphene oxide and a nanodiamond, comprising:

preparing a nanodiamond;

attaching a functional group on a surface of the nanodiamond by heat-treating the nanodiamond;

dispersing the nanodiamond comprising the functional group in a first solvent to prepare a nanodiamond dispersion;

dispersing a graphene oxide in a second solvent to prepare a graphene oxide dispersion; and

mixing the graphene oxide dispersion and the nanodiamond dispersion; and

forming a bond between the graphene oxide and the nanodiamond,

wherein the nanodiamond dispersion further comprises a catalyst.

2. The method of claim 1, wherein an average diameter of the nanodiamond is about 3 to 10 nm.

3. The method of claim 1, wherein

the functional group is attached on the surface of the nanodiamond by heat-treating the nanodiamond at a temperature of about 400°

C. to 500°

C. for about 1 to 3 h.

4. The method of claim 1, wherein the functional group attached on the surface of the nanodiamond is —

COOH.

5. The method of claim 1, wherein the catalyst is one or more selected from the group consisting of N,N′

-dicyclohexylcarbodiimide (DCC) and 4-(dimethyl amino)pyridine (DMAP).

6. The method of claim 1, wherein the first solvent is one or more selected from the group consisting of an amide-based solvent, an ether-based solvent, and a halogenated solvent.

7. The method of claim 1, wherein when the graphene oxide is dispersed in the second solvent, a hydroxyl group or an alkyl group is attached on the surface of the graphene oxide.

8. The method of claim 1, wherein when the graphene oxide is dispersed in the second solvent, a thickness of the graphene oxide is about 1 to 2 nm, and a diameter thereof is about 1 to 3 μ

m.

9. The method of claim 1, wherein an amount of about 50 to 150 parts by weight of the nanodiamond based on 100 parts by weight of the graphene oxide are mixed with the graphene oxide to form the bond between the graphene oxide and the nanodiamond.

10. The method of claim 1, wherein the bond between the graphene oxide and the nanodiamond is formed by esterification reaction.