Gear rotation

An example of carbon nanotube gear rotation. The gearshaft is a carbon nanaotube which may be just 1 to 10 nanometers in diameter. Benzyne molecules (as teeth) are attached to carbon nanotubes (shafts) to form gears that can operate at GHz frequencies. This clip shows rotation speeds of 50/70/100 rot/ns in a vacuum.
     
  Category: Carbon materials
  Source: NASA Ames Research Center