Modified calcium aluminate compound and production method therefor

Patent metadata

Field	Value
Publication number	US-11299398-B2
Application number	US-201716076125-A
Country	US
Kind code	B2
Filing date	Feb 13, 2017
Priority date	Feb 15, 2016
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The present invention provides a novel method for producing a calcium aluminate compound having a modified surface. The present invention provides: a method for producing a modified calcium aluminate compound characterized by irradiating a calcium aluminate compound dispersed in an organic dispersion medium with a femtosecond laser, thereby modifying the surface of the calcium aluminate compound; and a modified calcium aluminate compound characterized by being obtained by this method and having at least one of an OH group, a CO group, a CH group, and an NH group.

First claim

The invention claimed is:

1. A surface modified calcium aluminate compound having at least one of an OH group, a CO group, a CH group, or an NH group, wherein the surface modified calcium aluminate compound is produced by irradiating a calcium aluminate compound dispersed in a dispersion medium with a femtosecond laser, thereby modifying the surface of the calcium aluminate compound.

2. The surface modified calcium aluminate compound according to claim 1 having an average particle diameter of 7 μm or less.

3. The surface modified calcium aluminate compound according to claim 2 having a median diameter (D50) of 60 μm or less.

4. A method for producing a surface modified calcium aluminate compound according to claim 2 , comprising irradiating a calcium aluminate compound dispersed in a dispersion medium with a femtosecond laser, thereby modifying the surface of the calcium aluminate compound.

5. The method for producing a surface modified calcium aluminate compound according to claim 4 , comprising irradiating a calcium aluminate compound in a particulate form dispersed in an alcohol with a femtosecond laser, thereby atomizing the calcium aluminate compound in a particulate form.

6. The method for producing a surface modified calcium aluminate compound according to claim 4 , characterized by characterized by dispersing a calcium aluminate compound in a particulate form in alcohols having different polarities and irradiating the compound with a femtosecond laser, thereby controlling the particle diameter of the calcium aluminate compound in a particulate form.

7. The surface modified calcium aluminate compound according to claim 1 having a median diameter (D50) of 60 μm or less.

8. A method for producing a surface modified calcium aluminate compound according to claim 7 , comprising irradiating a calcium aluminate compound dispersed in a dispersion medium with a femtosecond laser, thereby modifying the surface of the calcium aluminate compound.

9. The method for producing a surface modified calcium aluminate compound according to claim 8 , irradiating a calcium aluminate compound in a particulate form dispersed in an alcohol with a femtosecond laser, thereby atomizing the calcium aluminate compound in a particulate form.

10. The method for producing a surface modified calcium aluminate compound according to claim 8 , characterized by characterized by dispersing a calcium aluminate compound in a particulate form in alcohols having different polarities and irradiating the compound with a femtosecond laser, thereby controlling the particle diameter of the calcium aluminate compound in a particulate form.

11. A method for producing a surface modified calcium aluminate compound, comprising irradiating a calcium aluminate compound dispersed in a dispersion medium with a femtosecond laser to produce a surface modified calcium aluminate compound having at least one of an OH group, a CO group, a CH group, or an NH group.

12. The method for producing a surface modified calcium aluminate compound according to claim 11 , wherein the dispersion medium is an alcohol, an ether, a saccharide, a hydrocarbon, a nitrogen-containing organic compound, a halogen-containing organic compound, a boron-containing organic compound, or a sulfur-containing organic compound.

13. The method for producing a surface modified calcium aluminate compound according to claim 12 , wherein the pulse width of the femtosecond laser is 10 −15 s or more and 10 −12 s or less.

14. The method for producing a surface modified calcium aluminate compound according to claim 12 , characterized in that the calcium aluminate compound is a compound having a composition of mayenite (Ca 12 Al 14 O 33 ) and having a crystalline structure constituted by three-dimensionally connected voids or katoite [Ca 3 A 12 (OH) 12 ].

15. The method for producing a surface modified calcium aluminate compound according to claim 11 , comprising irradiating a calcium aluminate compound in a particulate form dispersed in an alcohol with a femtosecond laser, thereby atomizing the calcium aluminate compound in a particulate form.

16. The method for producing a surface modified calcium aluminate compound according to claim 15 , wherein the pulse width of the femtosecond laser is 10 −15 s or more and 10 −12 s or less.

17. The method for producing a surface modified calcium aluminate compound according to claim 15 , characterized in that the calcium aluminate compound is a compound having a composition of mayenite (Ca 12 Al 14 O 33 ) and having a crystalline structure constituted by three-dimensionally connected voids or katoite [Ca 3 Al 2 (OH) 12 ].

18. The method for producing a surface modified calcium aluminate compound according to claim 11 , comprising dispersing a calcium aluminate compound in a particulate form in alcohols having different polarities and irradiating the compound with a femtosecond laser, thereby controlling the particle diameter of the calcium aluminate compound in a particulate form.

19. The method for producing a surface modified calcium aluminate compound according to claim 11 , wherein the pulse width of the femtosecond laser is 10 −15 s or more and 10 −12 s or less.

20. The method for producing a surface modified calcium aluminate compound according to claim 11 , wherein the calcium aluminate compound is a compound having a composition of mayenite (Ca 12 Al 14 O 33 ) and having a crystalline structure constituted by three-dimensionally connected voids or katoite [Ca 3 Al 2 (OH) 12 ].

Assignees

• Univ Kyoto
• Hitachi Zosen Corp
• New Tech Inc

Inventors

• Hirao Kazuyuki
• Visbal Heidy
• Hirano Minami
• Hikazudani Susumu
• Yoshida Satoshi
• Shono Emi

Classifications

• C01F7/164 Primary

  Calcium aluminates · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01F1/00

  Methods of preparing compounds of the metals beryllium, magnesium, aluminium, calcium, strontium, barium, radium, thorium, or the rare earths, in general · CPC title

• Y02E60/32

  Hydrogen storage · CPC title

• C01P2002/30

  Three-dimensional structures · CPC title