Torus-
A carbon nanotube, curved and connected to itself to form a torus or doughnut shape, is predicted to have other unique properties, such as magnetic moments 1000 times larger than previously expected, but only at certain specifications. Their properties vary widely depending on the actual specifications of the tube, such as the radius of the torus or the radius of the tube itself.
Nanobuds-
Attaching other fullerenes, such as the spherical buckyballs, to the surface of a carbon nanotube results in this structure. The resulting material has many useful properties of both the nanotubes and the attached fullerene. For instance, they have been found to be exceptional good field emitters. And theoretically, nanobuds could act as anchors to prevent the tubes from slipping in composite materials.
