Patent ID: 8226801
Filing Date: 2012-07-24
Classification: B82Y,C01B

Abstract:
1. A method of producing pristine nano graphene platelets, said method comprising: a) providing a pristine graphitic material comprising at least a graphite crystallite having at least a graphene plane and an edge surface, wherein said pristine graphitic material is defined as a graphitic material that has never been subjected to intercalation, chemical oxidation, fluorination, solvating or dissolving by a solvent; b) dispersing multiple particles of said pristine graphitic material in a liquid medium containing therein no surfactant to produce a suspension, wherein said multiple particles in said liquid have a concentration greater than 0.1 mg/mL and said liquid medium is characterized by having a surface tension that enables wetting of said liquid on a graphene plane exhibiting a contact angle less than 90 degrees; and c) exposing said suspension to direct ultrasonication at a sufficient energy or intensity level for a sufficient length of time to produce said nano graphene platelets.