Functionalizations Multiwalled carbon nanotubes (MWCN) 16 Carbon nanotubes 12 Fourier transform infrared spectroscopy 10 Functionalization 8 Thermogravimetric analysis 8 Yarn 8 Dispersions 6 Functionalized-MWCNT 6 Grafting (chemical) 6 Nanocomposites 6 Scanning electron microscopy 6 Spectroscopic analysis 6 UV-vis spectroscopy 6 chemistry 6 unclassified drug 6 Acid treatments 4 Biodegradable polymers 4 Chlorine compounds 4 Field emission 4 Field emission microscopes 4 Field emission scanning electron microscopy 4 Fillers 4 Functionalized carbon nanotubes 4 Ligands 4 Mechanical properties 4 Multi-walled carbon nanotubes 4 Nano-structured 4 Polystyrenes 4 Porosity 4