Carbon Nanostructured materials 116 Nanotubes 89 Tubes 49 Absorption and adsorption 26 Mechanical properties 16 Liquefied petroleum gas 14 Carbon composites 13 Carbon, Activated 12 Composite materials 12 Standards 9 Activated 8 Electrodes 8 Fuel cells 8 Materials 8 Natural gas 8 Catalysis 6 Environmental aspects 6 Alloys 5 Electronics 5 Patents 5 Diamond thin films 4 Fibrous composites 4 Fluid dynamics 4 Graphene 4 Heat exchangers 4 Nanocomposites (Materials) 4 Nanotechnology 4 Structure 4 Tribology 4