In traditional modified methods

the functionalized nanoparticles appear and behave like solids in the absence of solvents.In this paper

a new family of modified nanoparticles

which exhibit liquid-like behavior in the absence of solvents at room temperature

is prepared.The amine-functionalized multi-wall carbon nanotubes (MWNTs) derivative is obtained in a two-step process comprising of oxidation of the tubes with strong acid and then neutralization reaction and hydrogen bonding followed by a surface reaction with dipoly(ethylene glycol) octadecyl amine.The sample is investigated by Fourier transform-infrared spectrometer analysis (FTIR)

X-ray diffraction (XRD)

thermogravimetric analysis (TGA)

differential scanning calorimeter (DSC) and rheological analysis.As a result

the carboxyl and hydroxyl groups were found on the surface of MWNTs

when MWNTs were modified by strong acid.Dipoly(ethylene glycol) octadecyl amine is 40 wt% corresponding to the dense surface coverage of one modifying molecule per 50 carbon atoms of MWNTs.The material is a viscous liquid at room temperature with lower versatility and it can be dispersed in various solvents due to amphiphilic properties of the modifier molecule.Their dispersion

high thermal stability

low vapor pressure and ability to flow at low temperatures make them attractive as lubricants

plasticizers

or film-forming precursors.