2.2. working principle of ball milling. in this study, graphene was prepared using a qm-3b high-speed vibrating ball mill (specification: 80 ml; vibration frequency: 1200 r/min; motor specification: 220 v, 180 w) . 304 stainless-steel balls were used as grinding balls. the working principle is as follows: the high-speed rotation of the motor .
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