مقالههای Ahmad kompany
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
۱Study the stability of Si, Ge, Fe and Co in the interior surface of metallic carbon nanotube for hydrogen storage
اطلاعات انتشار: Iranian Journal of Hydrogen and Fuel Cell، دوم،شماره۳، ۲۰۱۵، سال ۰
تعداد صفحات: ۹
In this article, we have performed calculations for studying the stability of the carbon group elements such as Si and Ge and also the magnetic elements like Fe and Co via first principle investigations. We found that Si and Ge decoupled from the interior surface of carbon nanotubes, this fact was independent in curvature, radius, conductivity and numbers of atoms in the carbon nanotubes. But the magnetic elements bonded to the surface of the tube via electronegativity factor. The binding energy calculated for Co is –3.82 eV which is more stable than that of Fe (–2.65 eV) due to decrease more in its magnetization. The magnetization of Fe and Co changed from 4.00 μ_B to 3.40 μ_B and 3.00 μ_B to 1.75μ_B respectively. Finally, we came to conclusion that carbon group elements are favorable for hydrogen absorption inside the carbon nanotube whereas the magnetic elements are suitable for hydrogen adsorption.
۲Dopant induced changes in physical properties of ZnO:Mg nanosuspensions: study of antibacterial activity
اطلاعات انتشار: Scientia Iranica، بيستم،شماره۶، ۲۰۱۳، سال ۰
تعداد صفحات: ۷
Sol–gel method is successfully used for synthesis of ZnO nanoparticles doped with different concentrations of Mg. The structure, morphology, chemical composition, optical and antibacterial activity of the nanoparticles were studied as a function of the Mg doping concentration. The synthesized ZnO samples show hexagonal Wurtzite structure, and the phase segregation takes place for 15% amount of doping.TEM images verifies the formation of nanoparticles in the range of 30–55 nm. FTIR and EDS results also confirm the successful incorporation of Mg in ZnO structure. Optical investigation indicates the increase in band gap energy with increase of doping content. The antibacterial activities of the nanosuspensions were tested against Escherichia Coli (Gram negative) and Streptococcus Mutans (Gram Positive) cultures. ZnO:Mg nanosuspension shows high antibacterial activity which slightly decreases with the amount of Mg .
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