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Showing 3 results for Hasani
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.


Oxidation Kinetics of Magnesium Powder Particles in Non-Isothermal Condition
M. Soltani, A. Seifoddini, S. Hasani,
Volume 39, Issue 1 (Journal of Advanced Materials-Spring 2020)
Abstract
In this research, the effect of heating rate on oxidation kinetics of magnesium powder particles under non-isothermal conditions was studied. For this purpose, differential thermal analysis (DTA) and thermogravimetry analysis (TGA) was done on magnesium powder particles at three heating rates of 5, 10 and 20 K min-1 up to 1000 °C under air atmosphere. Also, in order to better understand the oxidation process of magnesium powder, three temperatures were selected according to the DTA curve at a heating rate of 20 K min-1. Then, samples of magnesium powder were heated up to these three temperatures with heating rate of 20 K min-1 and were subjected to X-ray diffraction (XRD) and scanning electron microscopy (SEM) for phase and microstructural analysis. Then, kinetic studies were performed using some isoconversional methods such as Starink and Friedman as well as direct and indirect fitting methods. The activation energy (E) and pre-exponential factor (lnA) for oxidation of magnesium powder were in the range of 327-956 kJ mol-1 and 45-135 min-1, respectively. The reaction models for heating rates of 5, 10 and 20 K min-1 were obtained to be A3/2, R2 and D1, respectively.

THE EFFECT OF DY- DOPING ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF MN-ZN FERRITE NANOPARTICLES
M. Shayestefar, A. R. Mashreghi, S. Hasani ,
Volume 40, Issue 1 (Journal of Advanced Materials-Spring 2021)
Abstract
Mn0.8Zn0.2Fe2-xDyxO4 (where x= 0, 0.025, 0.05, 0.075, 0.1) ferrite nanoparticles were synthesized by auto- combustion sol-gel method for the first time in this study. The effect of Dy-doping on the structural and magnetic properties of the produced specimens was examined using the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometery (VSM), and field emission scanning electron microscope (FE-SEM). The results showed that a cubic spinel structure was formed in all of the synthesized specimens. It was also found that the addition of Dy increased the lattice parameter while decreased the average of crystallites size. Furthermore, the FE-SEM micrographs showed that Dy not only plays an effective role in reducing the agglomeration of nanoparticles and their distribution, but also reduces the average of particle size. It was also observed that the addition of Dy had no effect on the morphology of the synthesized nanoparticles. Investigation of the magnetic properties revealed a clear decrease in the saturation magnetization and coercivity by the Dy addition. So that the saturation magnetization of the samples decreased from 66.3 to 58.4 emu/g and the coercivity decreased from 78.5 to 71.9 Oe.

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