Multi-walled carbon nanotube (MWNT), coloured transmission electron micrograph (TEM). MWNTs are cylindrical fullerene molecules (nanotubes) with multiple outer layers. Fullerenes are a structural form (allotrope) of carbon. These MWNTs are functionalised, meaning different functional groups (groups of atoms which are responsible for a molecule's chemical behaviour) have been grafted on at the surface of the nanotubes. The fact MWNTs have multiple layers means this will not result in unwanted changes in the nanotube's mechanical or electrical properties. Such structures could have a wide range of technological and medical uses. Magnification: x73,400 when printed 10 centimetres wide.
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