Patent
US 8,926,935Compression Processes for Graphene Sheets
Gautham Krishnaiah
US
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Patent
Atlas literature
Patent
US 8,926,935Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for preparing graphene sheets having a surface area of at least about 100 m2/g and a carbon to oxygen molar ratio of between about 3:2 to about 1000:1, comprising the steps of thermally exfoliating graphite oxide to produce graphene sheets by heatin g the g raphite oxide to a temperature of at least about 600 0C at a rate of at least about 120 0C, conveying the graphene sheets in a closed system to a compression apparatus, and compressing the graphene sheets with a pressure of about 5 to about 1000 psi.
The process of claim 1, wherein the pressure is about 5 to about 250 psi.
The process of claim 1, wherein the pressure is about 10 to about 250 psi.
The process of claim 1, wherein the graphene sheets are stored before being conveyed to the compression apparatus.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.05 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.1 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a particle size distribution such that no more than about 10 volume percent of particles have a size of less than about 20 pm.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 200 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 300 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 400 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 600 m2/g.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 500:1.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 200:1.
The process of claim 1, wherein the graphene sheets produced by subjecting graphite oxide to thermal treatment are reduced and/or annealed prior to being compressed to produce graphene sheets.
The process of claim 1, further comprising the step of reducing and/or annealing the graphene sheets after they have been compressed.
22. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 10:1.
24. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 50:1.
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Materials described outside the worked examples.
graphene sheets
graphite oxide
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Surface Area | ≥ 100 m2/g | graphene sheets |
Bulk Density | ≥ 0.05 g/cm3 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,926,935Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for preparing graphene sheets having a surface area of at least about 100 m2/g and a carbon to oxygen molar ratio of between about 3:2 to about 1000:1, comprising the steps of thermally exfoliating graphite oxide to produce graphene sheets by heatin g the g raphite oxide to a temperature of at least about 600 0C at a rate of at least about 120 0C, conveying the graphene sheets in a closed system to a compression apparatus, and compressing the graphene sheets with a pressure of about 5 to about 1000 psi.
The process of claim 1, wherein the pressure is about 5 to about 250 psi.
The process of claim 1, wherein the pressure is about 10 to about 250 psi.
The process of claim 1, wherein the graphene sheets are stored before being conveyed to the compression apparatus.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.05 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.1 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a particle size distribution such that no more than about 10 volume percent of particles have a size of less than about 20 pm.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 200 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 300 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 400 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 600 m2/g.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 500:1.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 200:1.
The process of claim 1, wherein the graphene sheets produced by subjecting graphite oxide to thermal treatment are reduced and/or annealed prior to being compressed to produce graphene sheets.
The process of claim 1, further comprising the step of reducing and/or annealing the graphene sheets after they have been compressed.
22. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 10:1.
24. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 50:1.
canceled
canceled
canceled
canceled
canceled
canceled
Materials described outside the worked examples.
graphene sheets
graphite oxide
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Surface Area | ≥ 100 m2/g | graphene sheets |
Bulk Density | ≥ 0.05 g/cm3 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,926,935Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for preparing graphene sheets having a surface area of at least about 100 m2/g and a carbon to oxygen molar ratio of between about 3:2 to about 1000:1, comprising the steps of thermally exfoliating graphite oxide to produce graphene sheets by heatin g the g raphite oxide to a temperature of at least about 600 0C at a rate of at least about 120 0C, conveying the graphene sheets in a closed system to a compression apparatus, and compressing the graphene sheets with a pressure of about 5 to about 1000 psi.
The process of claim 1, wherein the pressure is about 5 to about 250 psi.
The process of claim 1, wherein the pressure is about 10 to about 250 psi.
The process of claim 1, wherein the graphene sheets are stored before being conveyed to the compression apparatus.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.05 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.1 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a particle size distribution such that no more than about 10 volume percent of particles have a size of less than about 20 pm.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 200 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 300 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 400 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 600 m2/g.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 500:1.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 200:1.
The process of claim 1, wherein the graphene sheets produced by subjecting graphite oxide to thermal treatment are reduced and/or annealed prior to being compressed to produce graphene sheets.
The process of claim 1, further comprising the step of reducing and/or annealing the graphene sheets after they have been compressed.
22. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 10:1.
24. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 50:1.
canceled
canceled
canceled
canceled
canceled
canceled
Materials described outside the worked examples.
graphene sheets
graphite oxide
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Surface Area | ≥ 100 m2/g | graphene sheets |
Bulk Density | ≥ 0.05 g/cm3 |
Related documents with shared materials, methods, properties, or citations.
Patent
Atlas literature
Patent
US 8,926,935Patent drawings and their descriptions. Click a drawing to enlarge it.
Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.
A process for preparing graphene sheets having a surface area of at least about 100 m2/g and a carbon to oxygen molar ratio of between about 3:2 to about 1000:1, comprising the steps of thermally exfoliating graphite oxide to produce graphene sheets by heatin g the g raphite oxide to a temperature of at least about 600 0C at a rate of at least about 120 0C, conveying the graphene sheets in a closed system to a compression apparatus, and compressing the graphene sheets with a pressure of about 5 to about 1000 psi.
The process of claim 1, wherein the pressure is about 5 to about 250 psi.
The process of claim 1, wherein the pressure is about 10 to about 250 psi.
The process of claim 1, wherein the graphene sheets are stored before being conveyed to the compression apparatus.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.05 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a bulk density of at least about 0.1 g/cm3.
The process of claim 1, wherein the compressed graphene sheets have a particle size distribution such that no more than about 10 volume percent of particles have a size of less than about 20 pm.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 200 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 300 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 400 m2/g.
The process of claim 1, wherein the graphene sheets have a surface area of at least about 600 m2/g.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 500:1.
The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of between about 3:2 to about 200:1.
The process of claim 1, wherein the graphene sheets produced by subjecting graphite oxide to thermal treatment are reduced and/or annealed prior to being compressed to produce graphene sheets.
The process of claim 1, further comprising the step of reducing and/or annealing the graphene sheets after they have been compressed.
22. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 10:1.
24. The process of claim 1, wherein the graphene sheets have a carbon to oxygen molar ratio of at least about 50:1.
canceled
canceled
canceled
canceled
canceled
canceled
Materials described outside the worked examples.
graphene sheets
graphite oxide
Additional fabrication and treatment steps described in the patent.
Performance values and ranges asserted in the specification or claims.
| Property | Value | Material |
|---|---|---|
Surface Area | ≥ 100 m2/g | graphene sheets |
Bulk Density | ≥ 0.05 g/cm3 |
Related documents with shared materials, methods, properties, or citations.
Pressure | 5–1000 psi | — |
Pressure | 5–250 psi | — |
Pressure | 10–250 psi | — |
Pressure | 5–1000 psi | — |
Pressure | 5–250 psi | — |
Pressure | 10–250 psi | — |
Pressure | 5–1000 psi | — |
Pressure | 5–250 psi | — |
Pressure | 10–250 psi | — |
Pressure | 5–1000 psi | — |
Pressure | 5–250 psi | — |
Pressure | 10–250 psi | — |