Carbon nanotubes, also known as the Pakistani tube, are a one-dimensional quantum material with a special structure (radial dimensions are in theCarbon nanotubes, also known as the Pakistani tube, are a one-dimensional quantum material with a special structure (radial dimensions are in the order of nanometer, the axial dimension is in the order of microns, and both ends of the tube are substantially sealed).  http://www.alfa-chemistry.com/products/carbon-nanotube-nanomaterials-45.htm  More ...