Graphene nanowindow structure and method for producing highly pure gas

Patent metadata

Field	Value
Publication number	US-11278849-B2
Application number	US-201816629788-A
Country	US
Kind code	B2
Filing date	Jul 4, 2018
Priority date	Jul 14, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A molecular sieve that has high selectivity and enables high-speed molecular permeation is provided. The molecular sieve has a nanowindow formed lacking a portion of carbon atoms in graphene, and one or more heteroatoms substituting for one or more carbon atoms that constitute a rim of this nanowindow, in which an electrostatic field is induced within the nanowindow by the heteroatoms, the rim of the nanowindow is relaxed in cooperation with a permeating molecule having a van der Waals' radius larger than the nanowindow, and the molecular sieve becomes permeable to the permeating molecule.

First claim

The invention claimed is:

1. A system for producing a highly pure gas by extracting permeating molecules from a mixed gas including permeating molecules and non-permeating molecules, the system comprising:
an irradiation source; and
a graphene nanowindow structure, comprising:
a nanowindow formed lacking a portion of carbon atoms in graphene; and
one or more heteroatoms substituting for one or more carbon atoms constituting a rim of this nanowindow,

wherein an electrostatic field is induced within the nanowindow by the heteroatoms,
wherein the graphene nanowindow structure can switch between an open state of being permeable to the permeating molecules, and a closed state of being impermeable to the permeating molecules, the open state being obtainable when the rim of the nanowindow is relaxed in cooperation with a permeating molecule having a van der Waals' radius larger than the nanowindow, and
wherein the irradiation source irradiates the rim of the nanowindow with an electromagnetic wave to switch the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules, the electromagnetic wave comprising infrared radiation.

2. A system for producing a highly pure gas by extracting permeating molecules from a mixed gas including permeating molecules and non-permeating molecules, the system comprising:
an irradiation source; and
a graphene nanowindow structure, comprising:
a nanowindow formed lacking a portion of carbon atoms in graphene; and
one or more heteroatoms substituting for one or more carbon atoms constituting a rim of this nanowindow,

wherein breathing vibration is induced in the rim of the nanowindow by the heteroatoms,
wherein the graphene nanowindow structure can switch between an open state of being permeable to the permeating molecules, and a closed state of being impermeable to the permeating molecules, the open state being obtainable when the rim of the nanowindow is relaxed in cooperation with a permeating molecule having a van der Waals' radius larger than the nanowindow, and
wherein the irradiation source irradiates the rim of the nanowindow with an electromagnetic wave to switch the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules, the electromagnetic wave comprising infrared radiation.

3. A system for producing a highly pure gas by extracting permeating molecules from a mixed gas including permeating molecules and non-permeating molecules, the system comprising:
an irradiation source; and
a graphene nanowindow structure, comprising:
a nanowindow formed lacking a portion of carbon atoms in graphene; and
one or more functional groups added to one or more carbon atoms constituting a rim of this nanowindow,

wherein an electrostatic field is induced within the nanowindow by the functional groups,
wherein the graphene nanowindow structure can switch between an open state of being permeable to the permeating molecules, and a closed state of being impermeable to the permeating molecules, the open state being obtainable when the rim of the nanowindow is relaxed in cooperation with a permeating molecule having a van der Waals' radius larger than the nanowindow, and the closed state being obtainable from the open state by rotating the directions of the functional groups by means of the electrostatic field, and
wherein the irradiation source irradiates the rim of the nanowindow with an electromagnetic wave to switch the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules, the electromagnetic wave comprising infrared radiation.

4. A system for producing a highly pure gas by extracting permeating molecules from a mixed gas including permeating molecules and non-permeating molecules, the system comprising:
an irradiation source; and
a graphene nanowindow structure, comprising:
a nanowindow formed lacking a portion of carbon atoms in graphene; and
one or more functional groups added to one or more carbon atoms constituting a rim of this nanowindow,

wherein breathing vibration is induced in the rim of the nanowindow by the functional groups,
wherein the graphene nanowindow structure can switch between an open state of being permeable to the permeating molecules, and a closed state of being impermeable to the permeating molecules, the open state being obtainable when the rim of the nanowindow is relaxed in cooperation with a permeating molecule having a van der Waals' radius larger than the nanowindow, and the closed state being obtainable from the open state by rotating the directions of the functional groups by means of the breathing vibration, and
wherein the irradiation source irradiates the rim of the nanowindow with an electromagnetic wave to switch the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules, the electromagnetic wave comprising infrared radiation.

5. A method for producing a highly pure gas by extracting permeating molecules from a mixed gas including permeating molecules and non-permeating molecules,
the method comprising:
supplying the mixed gas to a graphene having a nanowindow having a van der Waals' radius smaller than the permeating molecules and the non-permeating molecules and also having, in a rim of this nanowindow, one or more of a functional group, a heteroatom, or a defective part, all of the functional group, heteroatom, and defective part cooperating with the permeating molecules;
bringing an open state of allowing the permeating molecules to permeate the nanowindow while preventing permeation of the non-permeating molecules, through relaxation of the nanowindow as a result of cooperation between the permeating molecules and the functional group, the heteroatom, or the defective part; and
collecting the permeating molecules, the permeating molecules having permeated the nanowindow; and
irradiating, using an irradiation source, the rim of the nanowindow with an electromagnetic wave to switch from the open state to a closed state of being impermeable to the permeating molecules, the electromagnetic wave comprising infrared radiation.

6. The system of claim 1 , wherein applying an electric charge to the rim of the nanowindow also switches the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules.

7. The system of claim 2 , wherein applying an electric charge to the rim of the nanowindow also switches the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules.

8. The system of claim 3 , wherein applying an electric charge to the rim of the nanowindow also switches the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules.

9. The system of claim 4 , wherein applying an electric charge to the rim of the nanowindow also switches the graphene nanowindow structure to the closed state of being impermeable to the permeating molecules.

10. The system of claim 1 , further comprising a graphene membrane having the graphene nanowindow structure.

11. The method for producing a highly pure gas according to claim 5 , further comprising applying an electric charge to the rim of the nanowindow to switch from the open state to the closed state of being impermeable to the permeating molecules.

12. The method for producing a highly pure gas according to claim 5 , wherein the mixed gas is air.

13. The method for producing a highly pure gas according to claim 5 , wherein the highly pure gas is nitrogen.

14. The system of claim 2 , further comprising a graphene membrane having the

Assignees

• Univ Shinshu
• Kotobuki Holdings Co Ltd

Inventors

• Kaneko Katsumi
• VALLEJOS-BURGOS Fernando
• Takagi Toshio
• Murata Katsuyuki

Classifications

• B01D71/0211 Primary

  Graphene or derivates thereof · CPC title

• B01D71/0281

  Zeolites · CPC title

• C01B32/194

  After-treatment · CPC title

• B01D2325/26

  Electrical properties · CPC title

• B01D53/228

  characterised by specific membranes · CPC title