Description:  The top scanning tunneling microscope image shows an armchair nanotube, which has rows of hexagonal carbon molecules running along its axis. The bottom image shows a zigzag nanotube, which has rows of carbon molecules winding around its circumference.
Source:  Lieber Group, Harvard University
Story:  How metallic are metal nanotubes?
TRN May 30, 2001
TRN Categories:  Materials Science and Engineering
Form:  Still

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