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Open Access Article
1 - Design and synthesis of double shell hollow spheres of CuAl2O4 as a heterogeneous nanocatalyst for the synthesis of 1,2,3-Triazole compounds
Reza Khalifeh Mohammad Karimi Maryam RajabzadehIn this study, hollow structures of CuAl2O4 were prepared by using a simple hydrothermal method and carbon sphere as a hard template. The double shell hollow structures of CuAl2O4 were characterized by transmission electron microscopy (TEM), field emission scanning elec MoreIn this study, hollow structures of CuAl2O4 were prepared by using a simple hydrothermal method and carbon sphere as a hard template. The double shell hollow structures of CuAl2O4 were characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDS) and X-ray diffraction (XRD) analysis. The catalytic performance of this hollow nanostructure was evaluated for the synthesis of 1,2,3-triazole derivatives via the one pot cycloaddition reaction of benzyl halides, alkyl halides or epoxides with sodium azide and phenyl acetylene. Various factors such as the effect of solvent and different amounts of catalyst on the reaction efficiency were discussed. A variety of epoxides, benzyl or alkyl halides was used to afford the corresponding 1,2,3-triazole derivatives under the optimal reaction condition (Water/EtOH(1:1), 80°C, 10 min, 2 mol% of catalyst). The hollow structures of CuAl2O4 catalyst was readily removed from the reaction mixture by filtration and reused for five times without significant loss of catalytic activity. Manuscript profile -
Open Access Article
2 - Abstract
Design and synthesis of double shell hollow spheres of CuAl2O4 as a heterogeneous nanocatalyst for the synthesis of 1,2,3-Triazole compounds Reza Khalifeh, Mohammad Karimi, Maryam Rajabzadeh Optimization and characterization of plant-mediated green synthesis o MoreDesign and synthesis of double shell hollow spheres of CuAl2O4 as a heterogeneous nanocatalyst for the synthesis of 1,2,3-Triazole compounds Reza Khalifeh, Mohammad Karimi, Maryam Rajabzadeh Optimization and characterization of plant-mediated green synthesis of copper oxide nanoparticles using leaf aqueous extract of Hibiscus Sabdariffa L. Sahar Sadeqnia, Ebrahim Mollashahi, Alireza Einali, Omid Azizian-Shermeh Preconcentration and determination of Pb(II) using magnetic nanoparticles coated with DABCO-PDO ionic liquid with FAAS in aqueous samplesSara Khodadadi, Elaheh Konoz, Ali Ezabadi3and Ali Niazi Electrochemical reduction of graphene oxide by cyclic voltammetry and constant potential methods on copper substrate Majid Mirzaee, Changiz Dehghanian Synthesis and study of corrosion inhibition poly(epichlorohydrin) containing NTO and P(OH)2 on the mild steel in hydrochloric acid medium Fariborz Atabaki, Shahrzad JahangiriPreparation, characterization of graphene oxide nano catalyst functionalized copper-metformin complex and investigation of its catalytic activity in synthesis of tetrahydropyridine derivatives in mild condition Melika Eftekhar The Effect of temperature and pressure on the viscosity of aliphatic polyol esters lubricants Sara Golabvand, Morteza Zare Nano-cerium (IV) oxide as an efficient catalyst for the synthesis of azo dyesBita Baghernejad PEGylation of polyamidoamine-G3 dendrimer bonded with silica-coated magnetic nanoparticles as a pH-sensitive targeted drug delivery system Seyed Esmaeil Mohammadi Mehr, Mehdi Faramarzi, Seyed Aboutaleb Mousavi Parsa Determination of losartan using carbon paste electrode modified metal-organic framework MIL-101 by differential pulse voltammetry Mahzad Firouzi, Masoud Giahi, Mostafa Najafi, Seyed Saied Homami, Seyed Husain Hashemi Mousavi Synthesis of copper magnetic nanocomposite based on nanofibrillated cellulose and investigation of its catalytic performance in reduction of dyes Fatemeh Aliramezani, Hannaneh Heidari Manuscript profile -
Open Access Article
3 - Optimization and Characterization of Plant-Mediated Green Synthesis of Copper Oxide Nanoparticles Using Leaf Aqueous Extract of Hibiscus Sabdariffa L.
sahar sadegnia ebrahim molashahi alireza einali omid azizian sharmePhysical and chemical methods for synthesis of nanoparticles are not cost efficient. Present study is the first report to phytosynthesis of Copper Oxide nanoparticles using leaf aqueous extract of Hibiscus sabdariffa L. In this research, 2 ml of extract was added to 4 m MorePhysical and chemical methods for synthesis of nanoparticles are not cost efficient. Present study is the first report to phytosynthesis of Copper Oxide nanoparticles using leaf aqueous extract of Hibiscus sabdariffa L. In this research, 2 ml of extract was added to 4 ml of CuCl2.2H2O with concentration 10 mM. In order to obtain nanoparticles with uniform shape and size, the parameters affecting to synthesis, such as: pH of reaction, volume and concentration of extract, concentration of Copper salt and time of reaction were studied and all of them were optimized by UV-Vis spectrophotometry technique. Transmission Electron Microscopy (TEM) and Fourier Transformation Infra-Red (FT-IR) spectroscopy were used for investigated the shape and size of nanoparticles and detection the functional groups involved in the synthesis and stabilization Copper Oxide nanoparticles respectively. Results showed that the extract of Hibiscus sabdariffa L. can reduces the Cu 2+ ions to Cu 0 atoms with nano metric size and the color of solution changed to green. The TEM image of CuO NPs showed that the average size was between 10-20 nm and all of them had spherical shape. Also, the best condition for the synthesis of Copper Oxide nanoparticles were at: pH= 8, 9 mL of extract with concentration of 5% and CuCl2.2H2O with concentration of 10 mM and these nanoparticles were very stable in 6 days after synthesis. Manuscript profile -
Open Access Article
4 - Preconcentration and determination of Pb(II) using magnetic nanoparticles coated with DABCO-PDO ionic liquid with FAAS in aqueous samples
sara khodadadi elahe konoz ali niazi ali ezabadiIn this study, magnetic nanoparticles modified with DABCO-PDO ionic liquid were used to preconcentration and determination of trace amount of Pb(II) in aqueous samples using a flame atomic absorption instrument. Experimental factors affecting Pb(II) extraction and preco MoreIn this study, magnetic nanoparticles modified with DABCO-PDO ionic liquid were used to preconcentration and determination of trace amount of Pb(II) in aqueous samples using a flame atomic absorption instrument. Experimental factors affecting Pb(II) extraction and preconcentration were investigated and optimized. The calibration curve for Pb(II) was linear under the optimum condition in the concentration range of 0.8-1.6 µg l-1 with the determination coefficient of 0.9986. The concentration factor of Pb(II) was 100 with the detection limit of 0.25 µg l-1. The relative standard deviations (RSD %) for the concentration of the method were 1.8 and 2.5, respectively, with 4 successive replications in one day and between days. Lead determination was successfully applied for aqueous samples (rainwater in Tehran, tap water in Shahrak Gharb, Tehran, and mineral water). Recoveries in the ranges 90.6-97.8 was reported. Structure and morphology of the synthesized nanosorbent were investigated by using Fourier transform infrared spectroscopy (FTIR) analysis, scanning electron microscopy (SEM), and X-ray powder diffraction (XRD). Manuscript profile -
Open Access Article
5 - Electrochemical reduction of graphene oxide by cyclic voltammetry and constant potential methods on copper substrate
majid mirzayee chanigiz dehghanianIn this paper, graphene oxide (GO) was reduced using inexpensive and environmentally friendly methods on the copper substrate. These methods included constant potential and cyclic voltammetry. In the cyclic voltammetry method, GO was deposited on the copper substrate an MoreIn this paper, graphene oxide (GO) was reduced using inexpensive and environmentally friendly methods on the copper substrate. These methods included constant potential and cyclic voltammetry. In the cyclic voltammetry method, GO was deposited on the copper substrate and reduced. In the constant potential method, GO was firstly deposited by a drop cast and then reduced by constant potential method. Electrochemically reduced graphene oxide (ERGO) was characterized by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. In this study, the results showed that the constant potential method was the best method for the electrochemical reducing of GO. In this way, most functional groups had been reduced. In addition, a high density of the defects and wrinkling of the sheets was observed. The Electrochemical impedance spectroscopy (EIS) test also proved that most of the conductivity belonged to the GO reduced by the constant potential method. Consequently, the method can replace chemical methods for the reducing of GO and eliminate the major weakness of chemical methods that use toxic substances. Manuscript profile -
Open Access Article
6 - Synthesis and study of corrosion inhibition Poly (epichlorohydrin) containing NTO and P(OH)2 (PECH / NTO / P (OH)2 on the mild steel in hydrochloric acid medium
fariborz aabaki shahrzad jahangiriIn this way, the chlorine branches of poly (epichlorohydrin) (PECH) were substituted with 3-nitro-1,2,4-triazol-5-one(NTO) and P(OH)2 were replaced and The inhibitory efficiency of these compounds for immersed steel in hydrochloric acid medium has been investigated. Fou MoreIn this way, the chlorine branches of poly (epichlorohydrin) (PECH) were substituted with 3-nitro-1,2,4-triazol-5-one(NTO) and P(OH)2 were replaced and The inhibitory efficiency of these compounds for immersed steel in hydrochloric acid medium has been investigated. Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) and Elemental analyzer (CHN) and thermogravimetric analysis (TGA) and UV-visible were used to characterize the chemical composition of the synthesized organic compounds. Electrochemical impedance spectroscopy (EIS) and electrochemical polarization techniques were used to evaluate the corrosion inhibition performance of the organic inhibitors. The results of these studies showed that the sample containing NTO and P (OH)2 had the highest amount of corrosion inhibition.. Polarization results revealed that the corrosion inhibition efficiency in the inhibitor-containing samples was increased by increasing the concentration of the inhibitors in the corrosive electrolyte. Also, the results of the polarization test proved that these inhibitors acted as a mixed inhibitor in the acidic environment and by absorbing the steel surface in the corrosive environment, both the anode and cathode corrosion reactions were affected Manuscript profile -
Open Access Article
7 - Preparation, characterization of graphene oxide nano catalyst functionalized copper-metformin complex and investigation of its catalytic activity in synthesis of tetrahydropyridine derivatives in mild condition
Melika EftekharIn this research, at first, the graphene oxide sheets were prepared by the Hummers method and in continuation metformin molecule was linked to the edges of graphene oxide through the nucleophilic reaction of amine moieties of metformin with carbonyl groups of graphene o MoreIn this research, at first, the graphene oxide sheets were prepared by the Hummers method and in continuation metformin molecule was linked to the edges of graphene oxide through the nucleophilic reaction of amine moieties of metformin with carbonyl groups of graphene oxide by covalent bonding, followed by coordination copper metal on nitrogen atoms of metformin and formation of graphene oxide copper-metformin complex. The prepared nanocatalyst was well characterized by various techniques such as FT-IR, XRD, SEM, EDX, TGA and ICP-OES. All analyses confirmed the successful immobilization of this complex on the surface of GO. The synthesized catalyst was applied to evaluate its performance in the synthesis of tetrahydropyridine derivatives by the reaction of aryl aldehydes, aryl amines and ethyl acetoacetate which this method exhibited good catalytic efficiency with a high yield of products. Moreover, the suggested catalyst could be recycled for several times consecutive cycles without a noticeable decrease in its catalytic activity or metal leaching. Manuscript profile -
Open Access Article
8 - The Effect of Temperature and Pressure on the Viscosity of Aliphatic Polyol Esters Lubricants
sara Golabvand morteza zareViscosity is one of the most important properties of lubricants, which affect the processes of heat and mass transfer. The temperature and pressure dependence of the viscosity of lubricants are crucial for most industrial applications. In this work, available literature MoreViscosity is one of the most important properties of lubricants, which affect the processes of heat and mass transfer. The temperature and pressure dependence of the viscosity of lubricants are crucial for most industrial applications. In this work, available literature viscosity data of synthetic lubricants including aliphatic polyol esters on a wide pressure and temperature range used to study the pressure and temperature dependence of the viscosity. The experimental values were correlated with two linear equations, as a function of temperature and pressure. These simple and accurate linear equations provide reliable extrapolation of viscosity data for studied lubricants. Based on these correlations, the pressure and temperature viscosity coefficients ( and ) have been determined for these fluids. For studied lubricants, values decrease as the temperature or pressure increase. The coefficient decreases with the temperature and increases with the pressure. The values of and are dependent on the size and the degree of branching of the molecules. For the studied polyol esters, it has been observed that the and increase with the size of the molecule. The values of and are also increase with the branching of the chains of aliphatic polyol esters. In addition, our recent proposed equation is used to represent both the temperature and pressure dependence of the viscosity and demonstrated good correlation with the experimental data. Manuscript profile -
Open Access Article
9 - nano CeO2 as an efficient catalyst for the Synthesis of Azo Dyes
bita baghernezhadAzo compounds are widely used in the pharmaceutical, cosmetic, food, dyeing/textile industries, optics, biochemistry, biophysics and analytical chemistry due to their special physical, chemical and biological properties. In the present study, the synthesis of azo dyes b MoreAzo compounds are widely used in the pharmaceutical, cosmetic, food, dyeing/textile industries, optics, biochemistry, biophysics and analytical chemistry due to their special physical, chemical and biological properties. In the present study, the synthesis of azo dyes based on naphthols, xanthenes and hydroxy coumarins in the presence of nano- CeO2 catalyst was investigated. Avoid harmful solvents for the environment, mild conditions, high speed and short reaction time, simplicity of working up process; high efficiency and purity of the synthesized derivatives and recoverable catalyst utilization were the advantages of the proposed method. The structure of the synthesized compounds was determined by comparing their physical properties with reported and using IR and HNMR spectroscopy data.The structure of the synthesized compounds was determined by comparing their physical properties with reported and using IR and HNMR spectroscopy data.The structure of the synthesized compounds was determined by comparing their physical properties with reported and using IR and HNMR spectroscopy data. Manuscript profile -
Open Access Article
10 - PEGylation of polyamidoamine-G3 dendrimer bonded with silica-coated magnetic nanoparticles as a pH-sensitive targeted drug delivery system
seyed esmaeil mhamadi mehr Mehdi Faramarzi seyed abotaleb mosavi parsaThis research, reports the fabrication of a new pH-responsive nanocarrier based on iron oxide nanoparticle with dendrimer coating and PEG conjugated for targeted and controlled delivery of chemotherapy drugs to cancer cells. The structure of the nanocarrier was confirme MoreThis research, reports the fabrication of a new pH-responsive nanocarrier based on iron oxide nanoparticle with dendrimer coating and PEG conjugated for targeted and controlled delivery of chemotherapy drugs to cancer cells. The structure of the nanocarrier was confirmed by Fourier transform infrared (FT-IR) spectra analysis. transmission electron microscope (TEM), Field Emission Scanning Electron Microscopy (FE-SEM) and vibrating sample magnetometer (VSM) analysis showed that the nanocarrier has a spherical structure with super paramagnetic properties. The efficiency of nanocarrier was evaluated with cyclophosphamide chemotherapy drug. The in vitro drug release studies at different pH proved the pH-sensitivity of the nanocarrier. Due to the open state of dendritic structure in acidic pH, the maximum release observed at pH 4.5 (lysosomal pH). Mass transfer studies showed that drug release from nanocarrier is rapid in short contact time and slow in long contact time. These results indicate that cyclophosphamide-loaded magnetic nanocarrier is promising for targeted delivery and controlled drug release. Manuscript profile -
Open Access Article
11 - Determination of losartan using carbon paste electrode modified metal-organic framework MIL-101 by differential pulse voltammetry
Mahzad Firouzi Masoud Giahi Mostafa Najafi Seyed Saied Homami Seyed Husain Hashemi MousaviIn this research, at first, the metal organic framework (MIL-101) was synthesized characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). A highly sensitive electrochemical sensor was fabricated b MoreIn this research, at first, the metal organic framework (MIL-101) was synthesized characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). A highly sensitive electrochemical sensor was fabricated based on MIL-101 (a metal-organic framework) modified carbon paste electrode and used for determination of losartan. The electrochemical behavior of losartan was studied with cyclic voltammetry and chronoamperometry techniques. The modified electrode exhibited excellent electrocatalytic activity towards the oxidation losartan in phosphate buffer (pH=8). Determination of losartan by differential pulse voltammetry method showed that there are two linear relationships between losartan concentration and anodic peak current in the range of 1 to 10 and 10 to 200 μM with a detection limit of 0.7 µM. The effect of possible interferences on the voltammetric response of losartan was investigated. Finally, the modified electrode was used for determination of losartan in pharmaceutical and biological samples. The results showed the high ability for analysis of this drug in real samples. Manuscript profile -
Open Access Article
12 - Synthesis of copper magnetic nanocomposite based on nanofibrillated cellulose and investigation of its catalytic performance in reduction of dyes
Fatemeh Aliramezani Hannaneh HeidariIn this study, nanofibrillated cellulose (NFC) was used as a green and biodegradable material for the synthesis of copper magnetic nanocomposites without the addition of an external reducing agent or toxic solvents. Initially, nanofibrillated cellulose was magnetized fo MoreIn this study, nanofibrillated cellulose (NFC) was used as a green and biodegradable material for the synthesis of copper magnetic nanocomposites without the addition of an external reducing agent or toxic solvents. Initially, nanofibrillated cellulose was magnetized for easy separation using iron chlorides in ammonia medium, then used as a substrate and reducing agent for the formation of copper nanoparticles. The structure of the nanocomposite was characterized by various spectroscopic techniques including X‐ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transforms infrared spectroscopy (FT-IR), Energy dispersive spectroscopy (EDS), and Inductively coupled plasma atomic emission spectroscopy (ICP-OES). The effect of nanocomposite drying methods such as freeze-drying and ambient temperature on catalytic activity was also studied. The results showed that the recyclable magnetic nanocatalyst Fe3O4@NFC/Cu in comparison with other reported catalysts had significant catalytic activity in degradation of three organic dyes (methyl orange, methylene blue, and 4-nitrophenol) with rate constants of 35.1×10-2 s-1 1.48×10-2 s-1 and 5.41×10-2 s-1, respectively. Also, this catalyst was recovered and used 4 times without significant loss of activity. Manuscript profile
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