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A nanotube, as seen below, looks like a graphene sheet (one layer of a graphite structure) rolled up. It consists of hexagons.

Nanotubes are state of the art materials with extraordinary mechanical properties (stronger than the strongest metal) and also with interesting electronics applications.

There are various different types and sizes of nanotubes. The nanotube pictured above is single walled (only one graphene sheet rolled up), but multi walled nanotubes also exist. MW nanotubes have lots of concentric sheets inside.

It is also posssible to fill the interior of nanotubes with metals and also to promote a range of chemical reactions on its surface.

Nanotubes can be capped or have open ends. Below an open ended tube is shown:



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