Nanotubes 32 Carbon nanotubes 20 Nanostructured materials 17 Carbon 10 Purification 6 Dissertations 5 Dissertations, Academic 5 Nanocomposites (Materials) 5 Water 5 Lasers 4 Materials 4 Nanofluids 4 Optical fibers 4 Research 4 Synthesis 4 Environmental aspects 3 Graphene 3 Nanoparticles 3 Photonics 3 Absorption 2 Analysis 2 Carbon composites 2 Carbon, Activated 2 Chemical vapor deposition 2 Electric properties 2 Heat 2 Mechanical properties 2 Nanocrystals 2 Photoelectrochemistry 2 Sewage 2