Abstract
Expanded graphite (EG) was ball-milled for 80 h in a high-energy mill (planetary-type) under an air atmosphere and subsequently annealed at 1000 ℃ for 4 h under a vacuum atmosphere. The products were characterized by scanning electron microscopy (SEM). The results show that ball-milling EG produces nanoporous graphite powders. However, the nano-pores are hardly observed in the ball-milled and subsequently annealed EG powders.
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