Fig. 8From: Lung carcinogenicity of inhaled multi-walled carbon nanotube in ratsSEM images of bulk MWNT-7. The bulk MWNT-7 is composed primarily of large clumps of MWNT-7. The sizes of the aggregate are around 50Â nm in diameter. While less, there are also individual and fibrous MWNT-7Â s present in the bulk MWNT-7Back to article page