ball milling of graphite
ment, 1g of the graphite and 10g of melamine were put into a stainless steel grinding bowl (80mL) containing 200 stainless steel grinding ball (5mm). The bowl was sealed followed by fixing it in the planetary ballmill machine. The mixture was ball milled at 500rpm for 48h. After the ball milling, the asprepared product was washed with hot water