Carbon nanotubes are used to create direct and efficient solar propulsion for water vehicles:
http://www.technologyreview.com/energy/22423/
"When light is focused onto it, a boat about a centimeter long can travel as fast as eight centimeters per second. The second machine is a simple rotor with one nanotube strip on one side of each of its four fins. When exposed to direct sunlight, it spins at about 70 rotations per minute."
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