Hydrophilic carbon nanohorn aggregate and method for producing the same

Patent metadata

Field	Value
Publication number	US-11952281-B2
Application number	US-202217859129-A
Country	US
Kind code	B2
Filing date	Jul 7, 2022
Priority date	Jul 27, 2021
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

Disclosed is a hydrophilic carbon nanohorn aggregate comprising a carbon nanohorn aggregate having an oxygen-containing functional group introduced at a tip of a carbon nanohorn, and a cyclodextrin which is capping the tip of the carbon nanohorn and being stabilized.

First claim

The invention claimed is:

1. A hydrophilic carbon nanohorn aggregate comprising:
a carbon nanohorn aggregate having an oxygen-containing functional group introduced at a tip of a carbon nanohorn, and
a cyclodextrin that is capping the tip of the carbon nanohorn and being stabilized,
wherein the capping of the cyclodextrin is stabilized by an interaction with the oxygen-containing functional group.

2. The hydrophilic carbon nanohorn aggregate according to claim 1 , wherein the cyclodextrin comprises at least one selected from the group consisting of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, and derivatives thereof.

3. The hydrophilic carbon nanohorn aggregate according to claim 1 , wherein the oxygen-containing functional group is introduced by oxidizing the tip of the carbon nanohorn.

4. The hydrophilic carbon nanohorn aggregate according to claim 3 , wherein the oxygen-containing functional group is introduced by oxidizing the tip of the carbon nanohorn at 300° C. to 400° C.

5. A hydrophilic carbon nanohorn aggregate dispersion liquid comprising, the hydrophilic carbon nanohorn aggregate according to claim 1 and water.

6. The hydrophilic carbon nanohorn aggregate dispersion liquid according to claim 5 , wherein 90% by mass or more of the hydrophilic carbon nanohorn aggregate has a particle diameter of 400 nm or less in a particle size distribution obtained by dynamic light scattering method.

7. The hydrophilic carbon nanohorn aggregate according to claim 1 , wherein the interaction is achieved by hydrogen bonding.

8. The hydrophilic carbon nanohorn aggregate according to claim 1 , wherein the oxygen-containing functional group is introduced by oxidizing the tip of the carbon nanohorn at 300° C. to 400° C.

9. A method for producing a hydrophilic carbon nanohorn aggregate comprising:
oxidation treatment step to oxidize a carbon nanohorn aggregate, and
cyclodextrin treatment step to contact cyclodextrin with the oxidized carbon nanohorn aggregate.

10. The method for producing a hydrophilic carbon nanohorn aggregate according to claim 9 , wherein the oxidation treatment step is a step of introducing an oxygen-containing functional group into a tip of a carbon nanohorn.

11. The method for producing a hydrophilic carbon nanohorn aggregate according to claim 10 , wherein the cyclodextrin treatment step is a step of capping the tip of the carbon nanohorn with the cyclodextrin and fixing the cyclodextrin.

12. The method for producing a hydrophilic carbon nanohorn aggregate according to claim 9 , wherein in the oxidation treatment step, a degree of oxidation is adjusted by at least one of temperature, time, and gas atmosphere.

13. The method for producing a hydrophilic carbon nanohorn aggregate according to claim 9 , the oxidation treatment step is performed so that a degree of oxidation becomes such that the oxidized carbon nanohorn aggregate contains oxygen atoms in an amount of 1.0×10 −5 to 1.0 atomic %, based on total carbon atoms.

Assignees

• Nec Corp

Inventors

• Yuge Ryota

Classifications

• C01B32/18 Primary

  Nanoonions; Nanoscrolls; Nanohorns; Nanocones; Nanowalls · CPC title

• H01B1/04 Primary

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title

• C01P2002/88

  by thermal analysis data, e.g. TGA, DTA, DSC · CPC title

• C01P2004/50

  Agglomerated particles · CPC title