Author/Authors :
Sahebian, S Department of Materials Science and Engineering - Engineering Faculty - Ferdowsi University of Mashhad - Azadi Square, Mashhad , Zebarjad, S. M Department of Materials Science and Engineering - Engineering Faculty - Shiraz University - Namazi Square, Shiraz , vahdati Khaki, J Department of Materials Science and Engineering - Engineering Faculty - Ferdowsi University of Mashhad - Azadi Square, Mashhad , Lazzeri, A Department of Chemical Engineering - University of Pisa - Via Diotisalvi, Italy
Abstract :
In the current research, the role of both concentrated
nitric acid and ultrasound waves on oxidation of
multi-walled carbon nanotubes (MWNTs) was studied. The
functionalized MWCNTs were characterized by transmission
electron microscopy (TEM), thermogravimetric analyzer,
and Fourier transform infrared spectroscopy (FTIR)
techniques. It was found that desirable modifications to
MWNTs occurred after acid treatment. Carboxylic acid
groups were appeared on the side surfaces of MWNTs.
FTIR presented the formation of oxygen-containing groups
such as C=O and COOH after modification by concentrated
nitric acid. The TEM images showed that the aspect ratio
of opened MWCNTs was controlled by both ultrasonic
waves and acid treatment time. It was also found that the
exposure of about 4 h in nitric acid led to the highest
removal of the impurities with the least destructive effect.
Keywords :
Multi-walled carbon nanotube , Structure , Acid treatment , Ultrasonic waves
