A novel approach to exfoliating graphite into graphene using ultrasound coupled with a shear mixer in supercritical CO₂ is presented in this article. The influence of the ultrasound power and the shearing speed on the exfoliation efficiency was systematically studied, and the optimal processing parameters were achieved. In comparison with either the ultrasound or the shearing method, the coupling approach obtained a higher yield, up to 82.6%, and about 60% of the graphene sheets had fewer than three layers. The electrical conductivity of the film formed by the obtained graphene was up to 1.18 × 10⁶ S/m. A synergy exfoliation mechanism was proposed: the ultrasound activated the edges of the graphite, generating the gap between the graphite layers, and the shear mixer peeled off the graphene layer from the gap simultaneously. The coupling approach of ultrasound and the shear mixer enabled the production of the graphene.

中文翻译：

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超声结合剪切混合器在超临界CO _2中高效生产石墨烯

本文介绍了一种在超临界CO _2中使用超声与剪切混合器将石墨剥落成石墨烯的新方法。系统研究了超声功率和剪切速度对剥离效率的影响，获得了最佳的加工参数。与超声或剪切方法相比，偶联方法均获得了更高的产率，高达82.6％，并且约60％的石墨烯片少于三层。由所获得的石墨烯形成的膜的电导率高达1.18×10 ⁶S / m。提出了一种协同剥离机制：超声激活石墨的边缘，在石墨层之间产生间隙，并且剪切混合器同时从间隙中剥离石墨烯层。超声和剪切混合器的耦合方法使得能够生产石墨烯。