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Tahermansouri H.,Islamic Azad University at Amol | Abedi E.,Islamic Azad University at Amol | Heidari-Keshel S.,Tehran University of Medical Sciences | Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory
Materials Technology | Year: 2015

Carboxylated multiwall carbon nanotubes (MWCNT-COOH) were first modified by an imidazole derivative, 2-amino-1-methyl-5-(3,4,5-trimethoxybenzylidene)-1H-imidazol-4(5H)-one, to form a MWCNT-Im and then by thiosemicarbazide to produce MWCNT-Py. All products were characterised by Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscope, energy dispersive X-ray spectroscopy, solubility test, thermogravimetric analysis, derivative thermogravimetric and cellular investigations. These functionalisations have been chosen due to active sites of C5C and carbonyl groups in MWCNT-Im and NH2 and sulphur groups in MWCNT-Py, which might be used as functional materials in future. Toxicity of these samples was evaluated with human gastric (MKN45) and colon (SW742) cancer cells, and the killed cell numbers were measured by reduction in living cells with 3-(4,5-dimethyl-2-thiazolyl)- 2,5-diphenyltetrazolium bromide (MTT) after 48 h of cell culture experiments. Cellular investigations showed high toxicity of modified MWCNTs on the gastric cancer cells compared to colon cells. In addition, MWCNT-Py sample indicated the highest toxicity for both cancer cells compared to other samples. © 2015 W. S. Maney & Son Ltd. Source

Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Narimani K.,Inorganic Nanostructures and Catalysts Research Laboratory | Mohammadipanah F.,University of Tehran | Hamedi J.,University of Tehran | And 2 more authors.
Applied Surface Science | Year: 2015

In a new approach, a copper(II) tetraaza macrocyclic complex (CuTAM) was covalently bonded on modified multi-walled carbon nanotubes (MWCNTs). To achieve this purpose, MWCNTs were converted to MWCNT-COCl and then reacted to NH groups of TAM ligand. The prepared material was characterized by Fourier Transform Infrared (FT-IR), X-ray diffraction (XRD), Raman spectroscopy, thermal gravimetric analysis (TGA), and FESEM (field emission scanning electron microscopy). FT-IR and TGA demonstrated the presence of the organic moieties, and XRD proved that the structure of MWCNTs remained intact during the three modification steps. An increase in the ID/IG ratio in Raman spectra confirmed the surface modifications. Finally, the samples were subjected to an antibacterial assessment to compare their biological activity. The antibacterial test showed that the grafted complex on the surface of the nanotube (MWCNT-CO-CuTAM) has higher antibacterial activity against Bacillus subtilis ATCC 6633 than the MWCNT-COOH and CuTAM with 1000 and 2000 μg/mL. © 2015 Elsevier B.V. All rights reserved. Source

Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Zarabadi M.P.,Inorganic Nanostructures and Catalysts Research Laboratory
Solid State Sciences | Year: 2013

In a new approach, strong basic sites has been successfully prepared by loading of calcium nitrate (Ca) on organized nano-porous alumina (ONPA). The prepared CaONPAs were characterized by low-angle X-ray diffraction (XRD), N 2 adsorption-desorption isotherms (Brunauer-Emmett-Teller (BET)-Barret-Joyner-Halenda (BJH)), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). Measuring of the amount of the basic sites and the basicity was carried out by titration method, temperature-programmed desorption (TPD-CO2) and Hammett indicators. Resistance of the basic sites was also tested by washing with water. N2 sorption measurements showed that supporting of the calcium nitrate on ONPA can lead to the bimodal porosity at lower loading. BET surface area of the bare ONPA was 212 m 2/g which decreased to 111 m2/g for the 25% of loading of Ca (25CaONPA). The results pointed out that CaONPA samples have basicity between 18.4 < H- < 22 for 15 and 25% of loadings and well-preserved of the basicity after washing with water especially for 5 and 15% samples. Also no crystalline phase of CaO was observed for 25CaONPA which was calcined at 600 °C. © 2012 Elsevier Masson SAS. All rights reserved. Source

Jafarbegloo M.,Inorganic Nanostructures and Catalysts Research Laboratory | Jafarbegloo M.,Iran National Petrochemical Company | Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Mesbah A.W.,Inorganic Nanostructures and Catalysts Research Laboratory | And 2 more authors.
Catalysis Letters | Year: 2016

The influence of calcination temperature (500, 600 and 700 °C) on NiO-MgO solid solution formation and the performance of the resulting catalysts in CO2 reforming of methane was studied. The solid solutions and resulting catalysts were characterized by Brunauer-Emmett-Teller, XRD, temperature-programmed reduction (TPR), TEM and thermal gravimetric analysis techniques. Catalytic performance tests were carried out under 550-750 °C, 1 bar, CO2/CH4 = 1-3 mol/mol and space velocities of 30,000-120,000 ml/(h gcat). The catalyst calcined at 600 °C exhibited the best performance in terms of catalytic activity and stability and showed lowest amount of coke formation after 50 h-on-stream. The effect of calcination temperature on degree of NiO-MgO solid solution formation was demonstrated by both XRD and TPR profiles. The 600 °C calcination temperature was found to be an optimum as it caused modest NiO-MgO interaction, which is responsible for complete formation of the NiO-MgO solid solution with high nickel dispersion and resistant to coke formation. © 2015 Springer Science+Business Media New York. Source

Tarlani A.,Inorganic Nanostructures and Catalysts Research Laboratory | Joharian V.,Inorganic Nanostructures and Catalysts Research Laboratory | Narimani K.,Inorganic Nanostructures and Catalysts Research Laboratory | Muzart J.,CNRS Institute of Molecular Chemistry - Reims | Fallah M.,Inorganic Nanostructures and Catalysts Research Laboratory
Journal of Solid State Chemistry | Year: 2013

In a new approach, chromium (III) tetraaza dioxo ligand was grafted onto functionalized SBA-15 after four step reactions by using coordinating ability of anchored amino functionalized SBA-15. After the termination of each step, the obtained product was characterized by FT-IR, low-angle X-ray diffraction (LA-XRD), N2 adsorption-desorption isotherms (Brunauer-Emmett-Teller (BET)-Barret-Joyner-Halenda (BJH)) and thermogravimetric analysis (TGA), and used as catalyst for the efficient and regioselective alcoholysis of styrene oxide to 2-alkoxy-1-phenylethanol product at ambient temperature. © 2013 Elsevier Inc. All rights reserved. Source

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