Graphitic Nanofibers, Whiskers, and Polyhedral Crystals

The theoretical density of graphite is 2.25 g/cm. Mechanical milhng can reduce this density to as low as 1.85 g/cm [16], 

In view of its electronic structure, carbon atoms in graphite are strongly bonded in planes, and only weak van der Waals forces hold the planes together. This leads 

---