The Experts below are selected from a list of 7728 Experts worldwide ranked by ideXlab platform
M Mahdavian - One of the best experts on this subject based on the ideXlab platform.
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a combined experimental and electronic structure quantum mechanics approach for studying the kinetics and adsorption characteristics of Zinc nitrate hexahydrate corrosion inhibitor on the graphene oxide nanosheets
Applied Surface Science, 2018Co-Authors: Mojtaba Kasaeian, M Mahdavian, E Ghasemi, Bahram Ramezanzadeh, Ghasem BahlakehAbstract:Abstract The adsorption mechanisms and kinetics of Zinc Cations at the graphene oxide (GO) nanosheets-water interface were studied by experimental and theoretical approaches. Results showed that adsorption of Zinc Cations onto GO surface forms a monolayer and obeys Langmuir isotherm. Meanwhile, the kinetics of sorption best fits with the pseudo-second-order model, suggesting that the sorption process is more than one-step. Various characterization techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), ultraviolet-visible spectrophotometry (UV–Vis) and field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray spectroscopy (EDS) were conducted to describe the mechanism of the adsorption process. EIS and polarization tests results showed that Zinc Cations adsorption on the GO sheets provided active corrosion inhibition on mild steel in the chloride solution. The Zinc binding to GO surface was further probed from a theoretical perspective applying electronic quantum mechanics (QM) methods. Theoretical results clarified the adsorption of Zinc Cations onto active sites of GO sheets. The electronic-structure quantum mechanics approach revealed that Zinc Cation more strongly binds to the surface of GO(OH) compared with the other two mono-functionalized models namely GO(COOH) and GO(O). This finding was in good agreement with X-ray photoelectron spectroscopy (XPS) analysis.
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effect of inhibition synergism of Zinc chloride and 2 mercaptobenzoxzole on protective performance of an ecofriendly silane coating on mild steel
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Shima Alinejad, R Naderi, M MahdavianAbstract:Abstract This work aims to study the impact of Zinc Cation and 2-mercaptobenzoxzole (MBO) on the corrosion protection of a silane sol-gel coating on mild steel. First, effectiveness of the organic and inorganic inhibitors on the corrosion of bare mild steel in a NaCl solution was shown to be linked to formation of a surface film. Using electrochemical data as well as results of surface analysis, a sharp inhibition synergism was found when an equal mole percentage of ZnCl 2 and MBO was added to the NaCl solution. Finally, electrochemical data indicated superior performance of the coating with the combination of inhibitors.
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the effect of Zinc Cation on the anticorrosion behavior of an eco friendly silane sol gel coating applied on mild steel
Progress in Organic Coatings, 2016Co-Authors: Shima Alinejad, R Naderi, M MahdavianAbstract:To provide active protection of mild steel, an eco-friendly silane sol-gel coating with ZnCl2 as Zinc Cation source was used. The optimal concentration of Zinc Cation was found using electrochemical impedance spectroscopy (EIS) and surface analysis. Evaluation of EIS data indicated that the superiority of doped-silane is mainly attributed to the corrosion inhibitive function of Zinc Cation at interface. Zinc Cation showed no effect on the thickness and hydrophobicity of coatings which were evaluated by FESEM and water contact angle, indicating no influence on condensation reactions. Using electrochemical techniques and surface analysis, an insight into the Zinc Cation inhibition mechanism was obtained in the absence of silane coating. In the presence of Zinc Cation, FESEM/EDS indicated precipitation of a layer composed of Zinc hydroxide and/or oxide on the mild steel surface.
Robert C Haushalter - One of the best experts on this subject based on the ideXlab platform.
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synthesis and structural characterization of zintl anions containing the tris ethylenediamine Zinc Cation zn n2c2h8 3 te3 0 5en and zn n2c2h8 3 2 sn2te6 en
Polyhedron, 1997Co-Authors: Julie L Shreevekeyer, Christopher J Warren, Sandeep S Dhingra, Robert C HaushalterAbstract:Abstract Two Zintl anions which contain the [tris(ethylenediamine)-Zinc]2+ Cation have been synthesized and structurally characterized by single-crystal X-ray diffraction. When a constant current of 1 mA is applied between a ZnTe10 alloy cathode and a Ni plate anode, in a saturated solulion of tetrapropylammonium bromide in ethylenediamine, a deep red-purple solution is generated around the cathode as polyanions are generated. After a few days, small, black crystals formed, which were identified by single crystal X-ray diffraction as [Zn(N2C2H8)3][Te3]·0.5(N2C2H8) (1). The 1:1:1 stoichiometric reaction of the Zintl phase K4SnTe4 with ZnCl2 in the presence of (C2H5)4NBr in ethylenediamine at 100°C for 1 day in a sealed evacuated quartz tube gave crystals of [Zn(N2C2H8)3]2[Sn2Te6]·(en) (2). The structures of 1 adn 2 consist of discrete anions which are surrounded in the solid state by the tris(ethylenediamine)-Zinc Cations.
Shima Alinejad - One of the best experts on this subject based on the ideXlab platform.
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effect of inhibition synergism of Zinc chloride and 2 mercaptobenzoxzole on protective performance of an ecofriendly silane coating on mild steel
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Shima Alinejad, R Naderi, M MahdavianAbstract:Abstract This work aims to study the impact of Zinc Cation and 2-mercaptobenzoxzole (MBO) on the corrosion protection of a silane sol-gel coating on mild steel. First, effectiveness of the organic and inorganic inhibitors on the corrosion of bare mild steel in a NaCl solution was shown to be linked to formation of a surface film. Using electrochemical data as well as results of surface analysis, a sharp inhibition synergism was found when an equal mole percentage of ZnCl 2 and MBO was added to the NaCl solution. Finally, electrochemical data indicated superior performance of the coating with the combination of inhibitors.
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the effect of Zinc Cation on the anticorrosion behavior of an eco friendly silane sol gel coating applied on mild steel
Progress in Organic Coatings, 2016Co-Authors: Shima Alinejad, R Naderi, M MahdavianAbstract:To provide active protection of mild steel, an eco-friendly silane sol-gel coating with ZnCl2 as Zinc Cation source was used. The optimal concentration of Zinc Cation was found using electrochemical impedance spectroscopy (EIS) and surface analysis. Evaluation of EIS data indicated that the superiority of doped-silane is mainly attributed to the corrosion inhibitive function of Zinc Cation at interface. Zinc Cation showed no effect on the thickness and hydrophobicity of coatings which were evaluated by FESEM and water contact angle, indicating no influence on condensation reactions. Using electrochemical techniques and surface analysis, an insight into the Zinc Cation inhibition mechanism was obtained in the absence of silane coating. In the presence of Zinc Cation, FESEM/EDS indicated precipitation of a layer composed of Zinc hydroxide and/or oxide on the mild steel surface.
Ghasem Bahlakeh - One of the best experts on this subject based on the ideXlab platform.
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a combined experimental and electronic structure quantum mechanics approach for studying the kinetics and adsorption characteristics of Zinc nitrate hexahydrate corrosion inhibitor on the graphene oxide nanosheets
Applied Surface Science, 2018Co-Authors: Mojtaba Kasaeian, M Mahdavian, E Ghasemi, Bahram Ramezanzadeh, Ghasem BahlakehAbstract:Abstract The adsorption mechanisms and kinetics of Zinc Cations at the graphene oxide (GO) nanosheets-water interface were studied by experimental and theoretical approaches. Results showed that adsorption of Zinc Cations onto GO surface forms a monolayer and obeys Langmuir isotherm. Meanwhile, the kinetics of sorption best fits with the pseudo-second-order model, suggesting that the sorption process is more than one-step. Various characterization techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), ultraviolet-visible spectrophotometry (UV–Vis) and field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray spectroscopy (EDS) were conducted to describe the mechanism of the adsorption process. EIS and polarization tests results showed that Zinc Cations adsorption on the GO sheets provided active corrosion inhibition on mild steel in the chloride solution. The Zinc binding to GO surface was further probed from a theoretical perspective applying electronic quantum mechanics (QM) methods. Theoretical results clarified the adsorption of Zinc Cations onto active sites of GO sheets. The electronic-structure quantum mechanics approach revealed that Zinc Cation more strongly binds to the surface of GO(OH) compared with the other two mono-functionalized models namely GO(COOH) and GO(O). This finding was in good agreement with X-ray photoelectron spectroscopy (XPS) analysis.
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experimental and theoretical studies of the synergistic inhibition effects between the plant leaves extract ple and Zinc salt zs in corrosion control of carbon steel in chloride solution
Journal of Molecular Liquids, 2017Co-Authors: Ghasem Bahlakeh, Mohammad Ramezanzadeh, Bahram RamezanzadehAbstract:Abstract The synergistic inhibition effects between green corrosion inhibitors (GCI) extracted from Nettle leaves and Zinc Cations in corrosion control of carbon steel specimens in 3.5 wt% NaCl solution were studied by electrochemical techniques, surface analyses, molecular dynamics simulations and electronic-structure approaches. The inhibition mechanism and efficiency of corrosion inhibitors were evaluated by electrochemical impedance spectroscopy (EIS) and polarization test. The morphology and composition of the film deposited on the surface of carbon steel specimens dipped in the chloride solution containing different inhibitors were analyzed by field-emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS). The results obtained from EIS analysis confirmed that combination of Zinc salt (ZS, 200 ppm) and green corrosion inhibitor (200 ppm, GCI) effectively reduced the carbon steel corrosion in saline solution. Polarization test results demonstrated a mixed type inhibition effect between ZS and GCI inhibitors. Moreover, the results obtained from FE-SEM and XPS analysis showed that the organic compounds like hystamine, serotonin and quercetin could effectively form complexes with Zinc Cations and establish protective film over the steel surface. Furthermore, molecular dynamics simulations and electronic-structure methods applied on different variants of constructed complex inhibitors (i.e., hystamine-Zn-hystamine, serotonin-Zn-serotonin, and quercetin-Zn-quercetin) revealed that inhibitors adsorbed onto steel substrates via donor-acceptor adhesion mechanism. The theoretical results also clarified that the complexes of quercetin and Zinc Cation proved the strongest surface adsorption, suggesting their highest corrosion-inhibition performance.
Jose L Mascarenas - One of the best experts on this subject based on the ideXlab platform.
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the ββα fold of Zinc finger proteins as a natural protecting group chemoselective synthesis of a dna binding Zinc finger derivative
Chemical Communications, 2014Co-Authors: Jessica Rodriguez, Jesús Mosquera, Olalla Vazquez, Eugenio M Vazquez, Jose L MascarenasAbstract:We report the selective modifiCation of cysteine residues engineered in peptides that have two additional cysteine residues as part of a Cys2His2 Zinc finger motif. The chemoselective modifiCation is achieved, thanks to the protecting effect exerted by the Zinc Cation upon coordination with the native cysteines and histidines of the Zinc-finger fold. The strategy allows a straightforward synthesis of DNA binding Zinc finger constructs.
