Methods of treating graphitic materials and of preparing colloidal solutions including graphitic materials

Patent metadata

Field	Value
Publication number	US-11254577-B2
Application number	US-201716475179-A
Country	US
Kind code	B2
Filing date	Dec 29, 2017
Priority date	Dec 29, 2016
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

Embodiments of the present disclosure describe a method of preparing a colloidal solution comprising preparing a salted aqueous solvent and dispersing a graphitic material in the salted aqueous solvent. Embodiments of the present disclosure further describe a method of treating a graphitic material comprising agitating a graphitic material in a salted aqueous solvent and removing residual chemical species to obtain a treated graphitic material. Embodiments of the present disclosure also describe a colloidal solution comprising a liquid medium and a treated graphitic material dispersed in the liquid medium sufficient to form a colloidal solution.

First claim

What is claimed is:

1. A method of preparing a colloidal solution, comprising:
preparing a salted aqueous solvent, wherein the salted aqueous solvent includes sodium hypochlorite and sodium bromide; and
dispersing a graphitic material in the salted aqueous solvent, wherein the graphitic material includes one or more of few-layer graphene nanoplatelets, few-layer graphene, graphene nanosheets, graphene powder, graphene nanoribbons, carbon nanotubes, carbon spheres, and fullerenes.

2. The method of claim 1 , wherein a surface energy of the salted aqueous solvent is similar to a surface energy of the graphitic material.

3. The method of claim 1 , wherein a molar ratio of sodium hypochlorite to sodium bromide is about 1:1.

4. The method of claim 1 , wherein the graphitic material is dispersed via one or more of sonication and stirring.

5. A method of treating a graphitic material, comprising:
agitating a graphitic material in a salted aqueous solvent containing sodium hypochlorite and sodium bromide, wherein the graphitic material includes one or more of few-layer graphene nanoplatelets, few-layer graphene, graphene nanosheets, graphene powder, graphene nanoribbons, carbon nanotubes, carbon spheres, and fullerenes; and
removing residual chemical species to obtain a treated graphitic material.

6. The method of claim 5 , wherein a surface energy of the salted aqueous solvent is similar to a surface energy of the graphitic material.

7. The method of claim 5 , wherein residual chemical species include one or more of ionic chemicals, supernatant, solvent, and residual catalyst introduced during processing of the graphitic material.

8. The method of claim 5 , wherein the treated graphitic material is a water-soluble graphitic material.

9. The method of claim 5 , wherein the treated graphitic material is re-dispersed in a liquid medium to form a colloidal solution.

10. The method of claim 9 , wherein the liquid medium is water.

11. A colloidal solution, comprising:
a liquid medium; and
a treated graphitic material dispersed in the liquid medium sufficient to form a colloidal solution, wherein the treated graphitic material is a graphitic material treated in a salted aqueous solution,
wherein the graphitic material includes one or more of few-layer graphene nanoplatelets, few-layer graphene, graphene nanosheets, graphene powder, graphene nanoribbons, carbon nanotubes, carbon spheres, and fullerenes,
wherein the salted aqueous solution comprises sodium hypochlorite and sodium bromide.

12. The colloidal solution of claim 11 , wherein the liquid medium includes one or more of water, methanol, N-Methyl-2-pyrrolidone, tetrahydrofuran, and polymer monomer.

13. The colloidal solution of claim 11 , wherein the electronic properties of the graphitic material remain preserved in the colloidal solution.

14. The colloidal solution of claim 11 , wherein a sp2 hybridization of the graphitic material remains preserved in the colloidal solution.

15. The colloidal solution of claim 11 , wherein the colloidal solution is formed without any dispersants or surfactants.

Assignees

• Univ King Abdullah Sci & Tech

Inventors

• Xu Xuezhu
• Zhou Jian
• Lubineau Gilles

Classifications

• C01B32/194 Primary

  After-treatment · CPC title

• C01D3/10

  Bromides · CPC title

• C01B32/17

  Purification · CPC title

• C01B32/196 Primary

  Purification · CPC title

• C01B32/154

  Preparation · CPC title