PROCESS FOR THE PREPARATION OF GRAPHENE

Gordon George Wallace

Patent

Atlas literature

Patent

US 8,715,610

PROCESS FOR THE PREPARATION OF GRAPHENE

Gordon George Wallace

Claims

Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.

7 independent · 24 dependent

1
Independentgraphenegraphene oxidegraphite oxide
DOCKET NO.: GHAC-0014 PATENT Application No.: 12/738,758 Oﬃce Action Dated: This listing of claims will replace all prior versions, and listings, of claims in the application. Listing of Claims:
1. 2
  Dependent← claim 1graphene
  The process according to claim 1, in which the graphene dispersion is solution-processable.
2. 3
  Dependent← claim 1graphene
  The process according to claim 1, in which the graphene dispersion is water-based.
3. 5
  Dependent← claim 1reducing agent
  (Previously amended) The process according to claim 1, in which the reducing agent is an inorganic or organic reducing agent.
4. 9
  Dependent← claim 1base
  The process according to claim 1, in which the base is a water soluble inorganic or organic base.
5. 13
  Dependent← claim 1graphene oxidegraphite oxidegraphite
  The process according to claim 1, in which the graphene oxide is prepared by chemical oxidation of graphite to form graphite oxide which is then puriﬁed and exfoliated.
6. 16
  Dependent← claim 1
  (Previously amended) The process according to claim 1, in which a water immiscible liquid is added before or during the reduction.
7. 17
  Dependent← claim 1reducing agent
  (Previously amended) The process according to claim 1, in which the reducing agent is in the form of a solution. Page 3 of 7 DOCKET NO.: GHAC-0014 PATENT Application No.: 12/738,758 Oﬃce Action Dated:
8. 18
  Dependent← claim 1base
  The process according to claim 1, in which the base is in the form of a solution.
9. 24
  Dependent← claim 1graphene oxide
  The process according to claim 1, in which the graphene oxide is present in the dispersion at a concentration of less than 0.5 mg/mL.
10. 29
  Dependent← claim 1graphene oxidebase
  The process according to claim 1, in which the base is added to increase the pH of the graphene oxide dispersion to 6 or greater.
11. 31
  Dependent← claim 1graphene
  The process according to claim 1, the process being conducted under such conditions that the resultant graphene is capable of being dispersed in aqueous media free of agglomeration. Page of 7
4
Independent
canceled
19
Independent
canceled
20
Independent
canceled
21
Independent
canceled
22
Independent
canceled
23
Independent
canceled

Materials

Materials described outside the worked examples.

graphene

Product

graphene oxide

Precursor/Starting Material

Process steps

Additional fabrication and treatment steps described in the patent.

Chemical Reduction

Step 1

Process details

description:Reducing purified exfoliated graphite oxide (graphene oxide) in the presence of a base; base added to increase pH to 6 or greater, preferably 9 to 11; graphene oxide concentration less than 0.5 mg/mL; reducing agent (e.g. hydrazine 1.0-7.0 g of 35% per gram GO, or NaBH4; or organic: hydroquinone, dimethylhydrazine, N,N'-diethylhydroxylamine); base (e.g. ammonia 7.0-20.0 g of 28% per gram GO, sodium hydroxide, potassium hydroxide, methylamine, ethanolamine, dimethylamine, trimethylamine); optional addition of water immiscible liquid before or during reduction; product graphene dispersible in aqueous media free of agglomeration

Materials:graphene oxide

Why these are connected

Related documents with shared materials, methods, properties, or citations.

PROCESS FOR THE PREPARATION OF GRAPHENE | Matter42 Literature