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US 9,845,244 B2Granted
Method of forming graphene material by graphite exfoliation
AssigneeArisdyne Systems, Inc.
InventorsOleg Kozyuk, Peter Reimers
Life of this patent
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Abstract
A method of producing graphene sheets and plates from graphitic material including (a) mixing graphitic material particles in a liquid medium to form a suspension; (b) compressing the suspension; (c) directing the compressed suspension through a local constriction into an area of reduced pressure to decompress the suspension in less than 2×10−6 second to a pressure less than 20% of the compression pressure, thereby exfoliating graphene sheets and plates from the graphitic material.
Claims14
A method of producing a graphene material from graphitic material particles, the method comprising the steps of:
- (a) mixing the graphitic material particles in a liquid medium to form a graphite suspension;
- and
- (b) exposing said graphite suspension to a compression and explosive decompression treatment, the treatment comprising compressing the graphite suspension to a first pressure, directing the compressed graphite suspension at least once through a local constriction into an area of reduced pressure whereby the graphite suspension is decompressed from the first pressure to a second pressure, thereby expanding the graphitic material particles and exfoliating graphene material from the graphitic material particles to produce graphene material dispersed in said liquid medium,
- wherein the graphite suspension is decompressed from the first pressure to the second pressure in less than 2×10−6 second and wherein the pressure in the area of reduced pressure is maintained above the saturated vapor pressure of the liquid medium sufficient to prevent formation of cavitation bubbles.
1 more element
Dependencies are inferred from the claim text.