Search for: iron
Total 534 records
Article International Journal of Conservation Science ; Volume 9, Issue 2 , 2018 , Pages 277-290 ; 2067533X (ISSN) ; Dolati, A ; Emami, M ; Sharif University of Technology
Universitatea "Alexandru Ioan Cuza" din Iasi 2018
The corrosion process of two iron dagger handles decorated with bronze strips found from the Ziviyeh area, which is one of the important Iron Age sites in the northwest of Iran, is thoroughly investigated. X-ray radiography was used to obtain the damages and corrosion zones of the artifact. Optical and scanning electron microscopies were used to study the microstructure of cross sections and to achieve structural details about the metal matrix and corrosion layers. The X-ray diffraction method was used to study the chemical characterization of corrosion products. The results of studies have shown that severe stress on bronze strips is caused by the formation of goethite and lepidocrocite...
Nickel (II) and iron (II) / Dowex 50W: An effective catalyst for the Baeyer-Villiger oxidation of ketones using molecular oxygen and benzaldehyde, Article Journal of Chemical Research - Part S ; Issue 4 , 2000 , Pages 196-197 ; 03082342 (ISSN) ; Beni, Y. A ; Sharif University of Technology
Scientific Reviews Ltd 2000
A mixture of Ni(II) and Fe(II) supported on Dowex 50W catalyses Baeyer- Villiger oxidation of ketones using molecular oxygen and benzaldehyde
Article Ironmaking and Steelmaking ; Volume 38, Issue 6 , May , 2011 , Pages 442-446 ; 03019233 (ISSN) ; Askari, M ; Farahani, M ; Shahahmadi, A ; Sharif University of Technology
The oxidation of sponge iron products and its destructive effects on iron content as well as other properties have been considered by ferrous technologists for a long time. In this investigation, a unique new low temperature method of preventing and/or retarding the oxidation of direct reduced iron is introduced. Experimental results from laboratory and pilot plant tests show the success of the method which has been named cold briquetting of sponge iron. The optimum condition for briquetting is achieved at 80 kN (Lcm)-1, 6% binder, 10% sponge iron fines and 4% anthracite. While hot briquetted iron has become a successful method for the new generation of iron reduction plants, cold...
Investigation of the reaction of allyl(cyclopentadienyl)iron(II) dicarbonyl with iminium salts: Synthesis of ammonium salts of substituted five-membered-ring iron complexes, Article Organometallics ; Volume 26, Issue 1 , 2007 , Pages 201-203 ; 02767333 (ISSN) ; Ziyaei Halimehjani, A ; Saidi, M. R ; Sharif University of Technology
Series of quaternary ammonium salts of substituted five-membered-ring iron complexes were prepared by reaction of allyl(cyclopentadienyl)iron(II) dicarbonyl with iminium salts. Also, reactions of allyl-(cyclopentadienyl) iron(II) dicarbonyl with in situ prepared iminium salts afford the same products in good to excellent isolated yields. © 2007 American Chemical Society
A new approach for the in vitro identification of the cytotoxicity of superparamagnetic iron oxide nanoparticles, Article Colloids and Surfaces B: Biointerfaces ; Volume 75, Issue 1 , 1 January , 2010 , Pages 300–309 ; Simchi, A. (Abdolreza) ; Imani, M. (Mohammad) ; Shokrgozar, M. A. (Mohammad A.) ; Milani, A. S. (Abbas S.) ; Hafeli, Urs O ; Stroeve, Pieter ; Sharif University of Technology
Superparamagnetic iron oxide nanoparticles (SPIONs) are increasingly used in medical applications, such as targeting delivery and imaging. In the future, patients are more likely to be exposed to pharmaceutical products containing such particles. The study of toxicity of SPIONs has become of great importance in recent years, although the published data in this arena is limited. The aim of the present work is to investigate the cytotoxicity of SPIONs and the effect of the particles on the cell medium components. For this purpose, uncoated and polyvinyl alcohol (PVA) coated SPIONs with narrow size distribution were synthesized via a well-known coprecipitation method. The mouse fibroblast cell...
Article Journal of Coordination Chemistry ; Vol. 67, issue. 18 , Jul , 2014 , p. 3026-3032 ; Najafpour, M. M ; Zare, M ; Holynska, M ; Moghaddam, A. N ; Bagherzadeh, M ; Sharif University of Technology
In this paper, we report that a known dinuclear Fe complex, [tpa(H2O)FeOFe(H2O)tpa](ClO4)4 (tpa: tris(2-pyridylmethyl)amine), is an efficient catalyst toward organic sulfide oxidation in the presence of urea-hydrogen peroxide
Article Iranica Antiqua ; Volume 48 , 2013 , Pages 147-174 ; 00210870 (ISSN) ; Emami, S. M ; Malekzadeh, M ; Hassanpour, A ; Davami, P ; Sharif University of Technology
In this paper, an analysis is presented of some bronze vessels from recent excavations at the first millennium BC site of Sangtarashan in eastern Luristan, Iran, according to metallography (OM), ICP-OES and SEM-EDS methods to identify alloying as well as manufacturing processes. This study provides new evidence for a better understanding of the bronze archaeometallurgy during the Iron Age in Iran. It concludes that the artifacts contain homogenous and single phase tin bronze (Cu-Sn) alloy. The Sn content in the artifacts also allowed to apply mechanical operations on the vessels without causing brittleness. Apart from tin, other elements that are classified as trace elements were present,...
Article Frontiers of Chemical Science and Engineering ; Volume 6, Issue 3 , September , 2012 , Pages 253-258 ; 20950179 (ISSN) ; Papari, S ; Asadi, M ; Naderifar, A ; Golhosseini, R ; Sharif University of Technology
The effect of iridium and iron impregnation of HZSM-5 zeolite on the methanol to propylene reaction (MTP) was investigated. The selectivities of propylene and other hydrocarbons, and the conversion of methanol were compared by performing MTP in a small pilot plant. The results indicate that HZSM-5 zeolite modified by iron and iridium increased propylene selectivity by 6. 3% and 8%, respectively. The selectivity of propylene was higher for Ir/H-ZSM-5 than for Fe/H-ZSM-5, where Fe/H-ZSM-5 was more stable than Ir/H-ZSM-5. Analytic techniques, including X-ray diffraction, BET surface area, temperature-programmed desorption of ammonia, and inductively coupled plasma atomic emission spectroscopy,...
Synthesis, characterization and biological evaluation of a well dispersed suspension of gallium-68-labeled magnetic nanosheets of graphene oxide for in vivo coincidence imaging, Article Radiochimica Acta ; Volume 105, Issue 1 , 2017 , Pages 65-73 ; 00338230 (ISSN) ; Rahighi, R ; Tayyebi, A ; Feizi, S ; Sharif University of Technology
Walter de Gruyter GmbH 2017
Graphene oxide (GO) nanosheets were hybridized with Fe3O4 nanoparticles (NPs) to form magnetic GO (MGO) and were further labeled by [68Ga]GaCl3 as a potential drug delivery system. Paper chromatography, Fourier transform infra red (FTIR) spectroscopy, low-angle X-ray diffraction (XRD), CHN and atomic force microscopy (AFM) were utilized to characterize the trinary composite ([68Ga]@MGO). Biological evaluations of the prepared nanocomposite were performed in normal Sprague Dawley rats and it was found to be a possible host for theranostic radiopharmaceuticals. The results showed that the grafting of Fe3O4 NPs on nanocomposite reduced the unwanted liver and spleen uptakes and increased the...
Activation of hydrocarbon C-H bonds by iodosylbenzene: How does it compare with iron(iv)-oxo oxidants?, Article Chemical Communications ; Issue 12 , 2009 , Pages 1562-1564 ; 13597345 (ISSN) ; Latifi, R ; Kang, H. Y ; Nam, W ; De Visser, S. P ; Sharif University of Technology
Combined experimental and theoretical studies on the reactivity of iodosylbenzene (PhIO) show that PhIO is capable of activating weak C-H bonds of hydrocarbons via a hydrogen abstraction mechanism. © 2009 The Royal Society of Chemistry
Oxidation of aromatic alcohols to carbonyl compounds with oxygen catalyzed by iron (III) chloride supported on kieselguhr, Article Letters in Organic Chemistry ; Volume 2, Issue 6 , 2005 , Pages 559-560 ; 15701786 (ISSN) ; Ezabadi, A ; Karimi Jaberi, Z ; Sharif University of Technology
Oxidation of aromatic alcohols to corresponding aldehydes and ketones have been carried out using molecular oxygen and FeCl3 supported on kieselguhr as catalyst in good yields. © 2005 Bentham Science Publishers Ltd
Article Powder Metallurgy ; Volume 47, Issue 1 , 2004 , Pages 73-80 ; 00325899 (ISSN) ; Danninger, H ; Sharif University of Technology
IOM Communications Ltd 2004
The role of porosity on the wear behaviour of sintered iron was investigated. Sintered iron was used in preference to steel because the various alloy additions and matrix heterogeneity in the latter might affect the microwear behaviour and the role of porosity. The wear tests were performed in a pin on disc test bed under 10-40 N loads at 0·56 m s-1 sliding speed in air. For the given tribological conditions, it was found that the wear mechanism is delamination or mechanical wear, which is basically similar to that of wrought materials according to subsurface crack generation and crack propagation processes. However, the open pores on the surface act as a site for generation and collection...
Effect of C and Cu addition on the densification and microstructure of iron powder in direct laser sintering process, Article Materials Letters ; Volume 62, Issue 17-18 , 2008 , Pages 2840-2843 ; 0167577X (ISSN) ; Sharif University of Technology
Laser sintering of Fe-C-Cu steel powder for rapid manufacturing of sintered components for functional testing was studied. The effects of C and Cu addition on the densification and the attendant microstructural features were investigated. The influence of iron particle size on the sintering kinetics was also examined. It is shown that the alloying elements significantly improve the densification rate when fine iron particles and high laser intensity are used. The mechanism of particle bonding and the effect of the alloying elements are presented. © 2008 Elsevier B.V. All rights reserved
Article Journal of Materials Research and Technology ; Volume 9, Issue 3 , 2020 , Pages 6655-6664 ; Askari, M ; Shahahmadi, S. A ; Sharif University of Technology
Elsevier Editora Ltda 2020
In the present paper, the effects of charging of Cold-Briquetted Iron and Carbon (CBIC) into the electric furnace on the steelmaking operating parameters was investigated and compared to the performance of Cold Direct Reduced Iron (CDRI) and Hot-Briquetted Iron (HBI) as the other products of Direct Reduced Iron (DRI) family. The efficiency of the carbon charged through CBIC compared to free-charged carbon into the steelmaking furnace was also evaluated. The results revealed that although the energy consumption of CDRI is somewhat lower than CBIC, the Fe yield content of CBIC is higher and its tap time is lower than CDRI which may improve the productivity of industrial steelmaking plant....
M.Sc. Thesis Sharif University of Technology ; Davami, Parviz ; Varahram, Naser
The Machinable Austempered Ductile Iron (MADI), a new group of Austempered Ductile Iron (ADI), has been developed to remove the problems (hardness and cost) of ADI cast iron. MADI is a special kind of ductile iron which has proper machinabilty properties. This kind of ductile iron can be produced using a specific chemical composition and defined heat treatment process. By providing these conditions, the hardness of the cast iron will be in the range of as-cast cast iron. On the other hand, because of the especial production process, the cost of the final shape casting will be lower than ADI cast iron. In the present work, firstly the effect of heat treatment parameters, including the time...
Fundamental differences of substrate hydroxylation by high-valent Lron(IV)-Oxo models of cytochrome P450, Article Inorganic Chemistry ; Volume 48, Issue 14 , 2009 , Pages 6661-6669 ; 00201669 (ISSN) ; Bagherzadeh, M ; Nam, W ; De Visser, S. P ; Sharif University of Technology
An Iron(lV)-oxo heme(+·) complex (Compound I, Cpd I) is the proposed active species of heme enzymes such as the cytochromes P450 and Is elusive; therefore, biomimetic studies on active site mimics give valuable Insight Into the fundamental properties of heme active species. In this work we present density functional theory (DFT) calculations on substrate hydroxylatlon by a Compound I mimic [FeIV=O(Por+̇)Cl] and its one-electron reduced form [FeIV=O(Por)Cl]-. Thus, recent experimental studies showed that [FeIV =O(Por)Cl]- is able to react with substrates via hydride transfer reactions [Jeong, Y. J.; Kang, Y.; Han, A.-R.; Lee, Y.-M.; Kotani, H.; Fukuzumi, S.; Nam, W. Angew. Chem., Int. Ed....
Formation of carbon nanotubes in Iron-catalyzed arcing method: Effect of iron-ion charge in the aqueous medium [electronic resource], Article International Journal of Modern Physics B Condensed Matter Physics; Statistical Physics; Atomic, Molecular and Optical Physics ; 30 December 2011, Volume 25, Issue 32, PP. 4411-4417 ; Gheytani, S ; Simchi, A. (Abdolreza) ; Sharif University of Technology
Carbon nanotubes (CNTs) were synthesized via arc discharge in aqueous solutions containing ferrous and ferric irons to reveal the effect of iron-charge mole ratio, R = [Fe2+]/[Fe3+], on the purity of CNTs and the process yield. Raman spectroscopy and transmission electron microscopy were used to analyze the cathodic deposits. It is shown that the nucleation of multi-walled CNTs is catalyzed by ferric irons while their growth is affected by ferrous ions. Well-graphitized CNTs with a high-yield are obtained at R = 1 and total iron concentration of 0.05 M. The effect of iron charge is described based on the two-stage formation mechanism
On the formation of SWCNTs and MWCNTs by Arc-discharge in aqueous solutions: the role of iron charge and counter ions [electronic resource], Article Journal of Fullerenes, Nanotubes and Carbon Nanostructures ; 2011, Volume 19, Issue 4, Pages 317-328 ; Shervin, Sh ; Simchi, A. (Abdolreza) ; Sharif University of Technology
Single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) were synthesized in aqueous solutions containing FeCl2, FeCl3, FeSO4 and Fe2(SO4)3. The effects of iron charge and the counter ions on the formation of carbon nanotubes (CNTs) were investigated. Thermogravimetric (TG) analysis indicated that carbon multilayer structures including CNTs and multishell graphite particles were formed in deionized (DI) water without the iron precursor. SWCNTs were also synthesized in the presence of the iron ions. It was also found that the mole ratio of [Fe2+]/[Fe3+] in the solution has a significant influence on the purity of CNTs and the process yield. The highest yield was...
Preparation and biological evaluation of [67 Ga]-labeled-superparamagnetic iron oxide nanoparticles in normal rats, Article Journal of Nuclear Science and Technology ; Volume 97, Issue 1 , September , 2009 , Pages 51–56 ; Panahifar, A ; Mahmoudi, M. (Morteza) ; Akhlaghi, M. (Mahdi) ; Simchi, A. (Abdolreza) ; Sharif University of Technology
Gallium-67 labeled superparamagnetic iron oxide nanoparticles were prepared and evaluated for their altered biodistribution in normal rats. Superparamagnetic iron oxide nanoparticles with narrow size distribution were synthesized by co-precipitation technique using ferric and ferrous salts at molar ratio Fe3+/Fe2+=2:1 followed by structure identification using XRD, thermo gravimetric analysis , differential scanning calorimetric , vibrating sample magnetometer, high-resolution scanning electron microscopy,transmission electron microscopy and fourier transform infrared absorption techniques. In order to trace superparamagnetic iron oxide nanoparticles bio-distribution, the radiolabeled iron...
Synthesis, X-ray studies, DFT calculations and catalytic activity of a novel iron complex containing an N, O-type bidentate oxazine ligand, Article Polyhedron ; Volume 61 , 2013 , Pages 94-98 ; 02775387 (ISSN) ; Haghdoost, M. M ; Bagherzadeh, M ; Ellern, A ; Woo, L. K ; Sharif University of Technology
The reactions of FeCl3·3H2O and 2-(2′-hydroxyphenyl)-5,6-dihydro-1,3-oxazine (N-O) as a bidentate O, N donor ligand afforded a five-coordinated iron(III) complex, [Fe(N-O) 2Cl], with a distorted trigonal bipyramidal configuration. The complex [Fe(N-O)2Cl] was isolated as an air-stable crystalline solid and was fully characterized, including by single-crystal X-ray structure analysis. The complex [Fe(N-O)2Cl] shows very efficient reactivity in the oxidation of sulfides to their corresponding sulfoxides using urea hydrogen peroxide (UHP) as the oxidant at room temperature under air. To get an insight into the electronic structure of the complex, the experimental studies have been accompanied...