▎ 摘　　要

NOVELTY - Method for exfoliating graphitic nanomaterial to produce graphene, involves (a) using supersonic shock waves with extremely high specific energy of multiphase stream to convert potential energy of the multiphase stream to high energy cavitation nanobubbles that when collapsing generates supersonic shock interactions by injecting the graphitic nanomaterial and driving force into a supersonic reactor to form a multiphase mixture, (b) providing a compression to the multiphase mixture and increasing speed of the multiphase mixture to more than Mach 1, and subsequent condensation of the driving force in the multiphase mixture that generates nanobubbles, and (c) decelerating the multiphase mixture through supersonic threshold to collapse the nanobubbles, generating high intensity cavitation to exfoliate the graphitic nanomaterials to produce graphene, where the graphitic nanomaterial and driving force merge into a highly compressible multiphase mixture in step of injecting. USE - The method is useful for exfoliating graphitic nanomaterial to produce graphene. ADVANTAGE - The system has high intensity fluid dynamics, controls the expansion and compression ratio of the working stream, creates repulsive potential to balance the attractive inter-graphitic layer potential, creates high intensity and controllable cavitation, and alleviates the shortcoming of multiphase fluid dynamic with supersonic graphene exfoliation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a system comprising supersonic mixing zone, where the multiphase streams merge into highly compressible multiphase mixture, and a narrowing inlet valve zone which compresses and increases die speed of the multiphase mixture to supersonic, a nanobubbles generation zone where a condensation in the multiphase mixture and generates localized heat and nanobubbles, and a deceleration zone where the nanobubbles collapse and generate high intensity cavitation.