Figure 5From: High-yield Synthesis of Multiwalled Carbon Nanotube by Mechanothermal MethodSEM different images of mechanically activated graphite powders for 150 h after annealing at different temperatures:a low magnification, 1350°C;b high magnification, 1350°C;c low magnification, 1380°C; andd high magnification 1380°CBack to article page