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A peapod is formed by filling a nanotube with fullerenes, as shown
schematically below:
Fullerenes are rather mobile in the peapod, as seen in the real-time movie
obtained during the Transmission Electron Microscopy observation of David Luzzi
in 2000:
In reality, the harsh acid treatment used to open nanotubes damages also
nanotube walls. Fullerenes may enter not only though the open ends, but also
through defects in nanotube walls.
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