Hollow particles formed from 2-dimensional materials

Patent metadata

Field	Value
Publication number	US-11069890-B2
Application number	US-201716306354-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	May 31, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

The present invention relates to methods of fabrication of hollow shells/spheres/particles, core-shell particles and composite materials made from these particles.

First claim

The invention claimed is:

1. A method of producing graphene oxide shells comprising:
(a) admixing an organic removable substance in an aqueous solution, wherein said removable substance comprises naphthalene, 9-fluorenone, or paraffin, and said aqueous solution contains graphene oxide;
(b) emulsifying said aqueous solution to form graphene oxide shells coating said removable substance; and
(c) removing said removable substance from said shells.

2. The method of claim 1 , wherein the ratio between said removable substance and said graphene oxide is from about 500:1 to about 50:1 by weight.

3. The method of claim 1 , wherein said removable substance is a solid at room temperature and said solution of step (b) is maintained at a temperature above the melting point of said removable substance.

4. The method of claim 3 , wherein said temperature is controlled at between about 90° C. to 100° C.

5. The method of claim 1 , further comprising cooling said removable substance to a temperature below its melting point after step (b); and wherein step (c) comprises removing said substance by sublimation.

6. The method of claim 1 , wherein said graphene oxide of step (a) has a concentration ranging from about 20 ppm to about 5000 ppm.

7. The method of claim 1 , wherein said graphene oxide of step (a) has a concentration ranging from about 40 ppm to about 4000 ppm.

8. The method of claim 1 , wherein said graphene oxide is obtained from graphene oxide sheets having a lateral mean size of between about 0.5 μm to about 4 μm.

9. The method of claim 1 , wherein said aqueous solution has a pH between about 1 and about 5 in step (b).

10. The method of claim 1 , wherein the emulsifying step is promoted by a rotor at a shear rate of between about 1,000 to about 50,000 rpm.

11. The method of claim 1 , wherein the emulsifying step is promoted by sonication.

12. The method of claim 1 , further comprising mixing said graphene oxide shells with an aerogel matrix material and forming a matrix holding the shells together.

13. The method claim 12 , wherein said aerogel matrix material comprises resorcinol formaldehyde (RF).

14. The method of claim 1 , wherein said removable substance is admixed with nanoparticles and said emulsifying step (b) coats said nanoparticles with graphene oxide shells.

15. A graphene oxide shell produced according to the method of claim 1 .

16. The method of claim 1 , wherein said removable substance comprises naphthalene.

Assignees

• Univ Rutgers

Inventors

• Tomassone Maria S
• Smith Kurt B

Classifications

• B01F23/4111

  using vibrations · CPC title

• B01J13/203 Primary

  Exchange of core-forming material by diffusion through the capsule wall · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C01B2204/22

  Electronic properties · CPC title