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Showing 2 results for Maghrebi
Novel Approach for Electrochemical Functionalization of Graphene with Surfactant
A. Hasani, M. Baniadam, M. Maghrebi,
Volume 35, Issue 4 (Journal of Advanced Materials-Winter 2017)
Abstract

The electrochemical exfoliation of graphite via intercalation is one of the attractive methods to obtain graphene. However, presence of course graphite particles in product is the drawback of this method. In this research, the effect of adding cetyl trimethyl ammonium chloride (CTAC), on the amount of exfoliated graphene and functional groups was studied. Transmission electron microscopy, weighing, UV-vis spectroscopy and electrical conductivity were used for characterization of the products. According to results, presence of this surfactant decreases the erosion, while it increases the exfoliation of graphene flakes. However, after critical micelle concentration (CMC) of the surfactant, exfoliated weight decreased.


DISPERSION AND FLOATING PERCENTAGE AS A SIMPLE INDICATOR OF THE AMOUNT OF AMORPHOUS CARBONS IN CARBON NANOTUBE ARRAYS
F. Delshad, M. Maghrebi, M. Baniadam,
Volume 40, Issue 2 (Journal of Advanced Materials-Summer 2021)
Abstract
Carbon nanotubes contain impurities and deamorphization is one of the methods of their purification. In this study, for the first time, a solution of piranha with a ratio of 3:1 (30 ml sulfuric acid + 10 ml hydrogen peroxide) as well as microwave irradiation with processing time of 30 minutes were used to remove amorphous carbon from the nanotube arrays. Ultrasonication was performed to disperse pristine and purified carbon nanotubes in water and centrifugation was performed to separate large particles. To assess the removal of amorphous carbon, new characterization methods such as dispersed percent and floating percent were used. It was observed that with increase in the ultrasonication time (from 0 to 50 minutes), the dispersed percentage of treated arrays was increased (about 47%), while the floating percentage of pure array decreased (about 20%). These results are ascribed to the removal of amorphous carbon. The results of the thermo gravimetric analysis (TGA) were in good agreement with the results obtained from the newly proposed characterization methods.

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