Impact Factor :
1.025
Q1(Year 2015)
ISSN : 1026-3098
e-ISSN : 2345-3605
Published Issues
CuFe2O4 and ZrP2O7 nanoparticles as highly efficient catalysts for the one-pot synthesis of phthalazine derivatives under solvent-free conditions
2016
Abstract :
ZrP2O7 and CuFe2O4 nanoparticles as ecient and reusable heterogeneous catalysts have been used for the preparation of 2H-indazolo[2,1-b]phthalazine-triones and 1H-pyrazolo[1,2-b]phthalazine-diones, respectively, under solvent-free conditions in good to excellent yields and short reaction times.
Keywords :
Pyrazolophthalazines; Indazolophthalazine; Solvent-free conditions; CuFe2O4 NPs; ZrP2O7 NPs.
( 221 Visit ) ( 94 Download )

An Efficient One-pot Three-component Synthesis of Pyrido[2,3-d]pyrimidine Derivatives in the Presence of Nano Silica-supported Preyssler H14[NaP5W30O110]/SiO2 as a Green and Reusable Catalyst
2016
Abstract :
An efficient and mild condensation reaction of 6-aminouracil derivatives with various aromatic aldehydes and ethyl or methyl acetoacetate was performed in the presence of catalytic amounts of H14[NaP5W30O110]/SiO2 as a recyclable, eco-friendly and green nano-catalyst to afford the desired pyrido[2,3-d]pyrimidine derivatives in good to excellent yields.
Keywords :
Green chemistry, Pyrido[2,3-d]pyrimidine derivatives,Nano silica-supported Preyssler heteropolyacid, 6-Aminouracil derivatives, One-pot reaction
( 491 Visit ) ( 88 Download )

MCM-41-SO3H-catalyzed synthesis of highly substituted 3-amino-imidazo[1,2-a]pyridines or pyrazines via the Groebke-Blackburn-Bienaymé multicomponent reaction under grinding conditions at ambient temperature
2016
Abstract :
Environmentally-friendly and highly efficient method has been developed by a sequential one-pot, three-component reaction between isocyanides, aldehydes and 2-aminopyridines or 2 aminopyrazines under solvent-free and grinding- conditions at room temperature in the presence of nano-ordered MCM-41-SO3H.
Keywords :
MCM-41-SO3H, Groebke-Blackburn-Bienaymé,  grinding condition
( 239 Visit ) ( 33 Download )

Study of the BZ oscillating system in the presence of silica nanoparticles containing NiO using a new approach: Conductometry
2016
Abstract :
Oscillating chemical reactions are complex systems involving a large number of chemicalspecies such as ionic, radical and molecular intermediates, which exhibit fluctuation in their concentration with time. One of the oscillating chemical reactions is BZ {---}System. In this work for the first time a new, simple and appropriate method, i.e.conductometry, have applied for the investigation of BZ oscillating system.Furthermore, presence of SiO2 nanoparticles containing NiO apparently affected the intensity and period of BZ system. The effect of varying concentrationof , ,  and on the conductance of BZ oscillating chemical system at 20 (±0.1)°C was also investigated. The obtained results of this work indicated that rather than potential and color of the BZ system, the conductance of system is also oscillates during the reaction and is also proportional to the reactants concentration as well. The intensity, intensity and period of the oscillation are strongly depending on the concentration of reactants.
Keywords :
Conductometry;Oscillating chemical reaction; BZ oscillating system, NiO nanoparticles.
( 282 Visit ) ( 31 Download )

Copper-catalyzed N-arylation of heterocycles in ethylene glycol medium
2016
Abstract :
N-Aarylation of imidazole, benzimidazole, pyrazole, and indole was performed in the presence of CuI as the catalyst and NaOH as the base in ethylene glycol medium. Apparently, ethylene glycol played a dual role as both the reaction solvent and a ligand for the catalyst. All reactions proceeded selectively to give the corresponding N-arylated products. In some cases, O-alkylation or dehalogenation was observed which was explained by the proposed catalytic cycle. Conventional heating at 120 oC and microwave irradiation both were used, where the results showed that microwave irradiation could facilitate the reaction by lowering the reaction times and increasing the yields. The reaction medium was recovered and reused in several consecutive runs. 
Keywords :
N-Arylation, Ethylene glycol, Heterocycles, Homogeneous catalysis, Microwave-assisted synthesis 
( 388 Visit ) ( 25 Download )

Greenersynthesisof magnetic nanoparticles in an aqueous deepeutectic solvent
2016
Abstract :
The simple method of fabrication of crystalline superparamagnetic nanoferrite (Fe3O4) particles using oxidative hydrolysis of Fe (II) salt in deep eutectic solvent-water mixture is being reported. The spectral properties of Fe3O4 nanoparticles were characterized by Fourier Transform Infrared (FTIR) spectroscopy while X-Ray diffraction (XRD) as well as scanningelectron microscopy (SEM) techniques were used to estimate the crystalline structure and particle size. The results of the studies revealed that this technique could be adopted to synthesize agglomerate-free superparamagnetic Fe3O4 nanoparticles in the simple manner in deep eutectic solvent which may find potential application in the biosensor and corrosion protective coatings. 
Keywords :
Nanostructures, nanomagnetite, deep eutectic solvent. Green synthesis
( 205 Visit ) ( 41 Download )

Synthesis of 1, 4-dihydropyridines (DHP) Catalyzed by Trichloroisocyanuric Acid (TCCA) in Aqueous Media
2016
Abstract :
An array of 1, 4-dihydropyridines (DHP) derivativeswas synthesized by Hantzsch three-component reaction of aromatic aldehydes, ethyl acetoacetate and ammonium acetate using trichloroisocyanuric acid (TCCA) as an efficient catalyst in aqueous media. The proposed method was operationally simple and to make the process benign for the environment, water used as a reaction medium. No aromatization of dihydropyridinesproducts was done in the presence of TCCA as an oxidant.
Keywords :
Dihydropyridines; Trichloroisocyanuric acid (TCCA); Three-component reaction; Hantzsch reaction; Aqueous media.
( 385 Visit ) ( 51 Download )

Application of conformal mapping to the scattering of plane SH-waves by a cavity
2016
Abstract :
In seismic numericalmodelling, it is readilyto simulate the wave field of the cavities with simpleandregular geometric boundaries. However, the real cavities are always complex or irregular, such asgeneral quadrilateral orhorny model. In this paper, conformal mapping is applied to three representative cavity models, including a pentagon model, a generalized quadrangular model and a horny model. First of all, transform the original cavity modelinthephysical domain into certain simple regularmodelin the computational domain and accordingly transform the boundary condition inthephysical domain into that in the computational domain. Thencalculate the wave field on the boundary in the computational domain. Finally, we generate the wave field on the boundary in the physical domain by usingthe inverse conformal mapping,when the conformal mappingfunctionis invertible. Twoexperiments by adoptingeither a displacement boundarycondition or a stress boundary conditionillustratethat the wave fields for three different kinds of cavitiesmainly concentrate on the boundary of the corresponding cavity.
Keywords :
conformal mapping; cavity; scattering; seismic wave; numerical modelling
( 409 Visit ) ( 8 Download )

Heat transfer analysis in peristaltic slip flow with Hall and ion-slip currents
2016
Abstract :
This work is devoted to the study of heat transfer effects in peristaltically induced flow of an electrically conducting viscous fluid in an asymmetric channel. An incompressible fluid fills the porous space in a channel. Analysis is made in the presence of Hall and ion-slip effects. The effects of velocity and thermal slips at the boundaries are considered. The problems which govern the fluid flow and heat transfer are modeled in the wave frame of reference. Exact solutions have been constructed under realistic assumptions. Important features of peristaltic motion and heat transfer are studied with the varying values of Hall parameter, ion-slip parameter, Hartman number, permeability parameter, velocity slip parameter and thermal slip parameter. The graphical results for the field quantities are given in detail.
Keywords :
Hall effect; Ion-slip; Slip conditions; Ohmic dissipation; Peristalsis; Heat transfer.
( 280 Visit ) ( 17 Download )

Preparation, adhesion and barrier properties of bituminous composite coatings on steel 37 
2016
Abstract :
A series of bitumen/nano clay nanocomposite have been prepared through solvent intercalation technique by using mechanical agitation and sonication process. The structure of nanocomposite coatings was investigated by TEM, low angle X-ray diffraction and Fourier-transform infrared spectroscopy. To investigate barrier properties of nanocomposite coatings, polarization, salt fog test and pull-off adhesion tests have been employed. The results showed that bitumen/MMT nanocomposite coatings were superior to the pristine bitumen coating in corrosion protection effects. Also, it was observed that the corrosion protection of bitumen/clay nanocomposite coatings improved as the clay loading is increased up to 4 wt.%
Keywords :
Bitumen; Nanocomposite coating; Clay; Corrosion.
( 285 Visit ) ( 29 Download )

Petroleum refinery wastewater treatment in two-chamber microbial fuel cells (MFCS)
2016
Abstract :
Petroleum refinery wastewaters (PRW) contain water-soluble hydrocarbons which can not be separated by physical methods. In recent years, there have been enormous approaches to treat PRW. The most outstanding methods involve biological, photocatalytic, electro photo-Fenton and etc. Using microbial fuel cell is a new method to treat PRW. In the present paper, treatment of petroleum wastewater of Isfahan refinery (COD= 213.9 mg/l, PH=7.1) was investigated in twochamber microbial fuel cell having 350 mL anode and cathode capacity. Anaerobic activated sludge prepared from Isfahan refinery treatment reactors was used as inoculum. Maximum power production was 0.03 W/m2 at 33 using oxygen as cathodic electron acceptor. Also COD removal efficiency was 49.27% during 44 hr. To enhance power production of the MFC, potassium permanganate was used as cathodic electron acceptor. At temperature of 33 and 0.2 g/l permanganate concentration, the maximum power density was 0.95 W/m2 and COD removal efficiency was 78% during 44hr. Then effect of temperature and external resistance on treatment of PRW was investigated. In fact the motivation of this paper is investigation of COD removal from PRW in two-chamber MFC.
Keywords :
Petroleum refinery wastewater, Microbial fuel cell, Chemical oxygen demand
( 449 Visit ) ( 38 Download )

α-C2SH synthesis in the mixtures with CaO/SiO2 = 1.5 and application as a precursor for binder material
2016
Abstract :
The hydration and strength properties of the binder material created on α-C2SH basis were determined. The binder material was prepared by mixing α-C2SH (C/S = 1.5; 16 h, 200 oC) and quartz sand (1:1 by mass) in a homogeniser for 30 min. Later on, sample was ground in a vibrating cup mill at 950 rpm for 4 min and burned at 450 oC for 30 min under air atmosphere. It was determined that calorimetric curve of created binder material differs from the one of ordinary cements as it involves only the three exothermic reactions and the amount of total cumulative heat grows with the increasing hydration time. As expected, the tendency of strength increment was observed after 7-28 days of hardening: compressive strength increased to 15.5 and 24.0 MPa, respectively. The products of synthesis and hardening were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and simultaneous thermal analysis (STA).
Keywords :
a-C2S hydrate; calcium silicate hydrate (C-S-H); hydrothermal synthesis; kilchoanite; binder material
( 227 Visit ) ( 19 Download )

Impact of natural convection and diffusion on variation of oil composition through a fractured model
2016
Abstract :
The first step to study oil reservoirs is determination of reservoir fluid composition in both horizontal and vertical directions. In this research, fluid composition distribution is investigated as a result of diffusion and natural convection in a naturally fractured model. A two-component single phase fluid and a rectangular two-dimensional fractured oil reservoir with a known temperature profile are used in this study. MATLAB software is exploited to solve governing equations, numerically. According to results, thermal diffusion has the greatest impact on the variation of fluid composition, followed by pressure and molecular diffusions, respectively. Moreover, it is found out that even a small convection would change the fluid composition distribution, considerably. Fluids tend to flow through the fracture due to its high permeability; therefore, a counterclockwise convective cell would flow in the reservoir.
Keywords :
Convection-Diffusion, Composition Variation, Fractured Model, Binary Mixture
( 499 Visit ) ( 32 Download )

Influence of the Process Parameters on the Foam Fractionation Treatment of Olive Mill Wastewater 
2016
Abstract :
Olive mill wastewater (OMW) is a high organic load waste produced from the three-phase decanter system used in the processing of olives for oil that has phytotoxic and antibacterial phenolic compounds, which makes this waste to resist biological degradation. Foam fractionation has not yet been studied with regard to its potential for treatment of such wastewaters. In the present study, this technique was investigated in a simple model system. The effect of different operational conditions, namely, surfactant concentration, process time, pH and gas flow rate were evaluated in this study. Statistical analysis of the fractional factorial design revealed that the surfactant concentration, pH and the gas flow rate are the most influential process parameters. Low surfactant concentration and pH of 3-4 were found to be advantageous in terms of good chemical oxygen demand (COD) removal. More than 80% of COD was removed through a single stage foam fractionation process. This method has proved to be a feasible technique for the OMW effluent treatment. 
Keywords :
Foam fractionation, Fractional factorial design, Olive mill wastewater, COD removal, Effluent treatment
( 966 Visit ) ( 18 Download )

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Published Issues
2017
Transactions on Civil Engineering
Transactions on Mechanical Engineering
Transactions on Chemistry and Chemical Engineering
Transactions on Computer Science & Engineering and Electrical Engineering
Transactions on Industrial Engineering
Transactions on Nanotechnology
2016
2015
Transactions on Civil Engineering
Transactions on Mechanical Engineering
Transactions on Chemistry and Chemical Engineering
Transactions on Computer Science & Engineering and Electrical Engineering
Transactions on Industrial Engineering
Transactions on Nanotechnology
2014
Transactions on Civil Engineering
Transactions on Mechanical Engineering
Transactions on Chemistry and Chemical Engineering
Transactions on Computer Science & Engineering and Electrical Engineering
Transactions on Industrial Engineering
Transactions on Nanotechnology
2013
Transactions on Civil Engineering
Transactions on Mechanical Engineering
Transactions on Chemistry and Chemical Engineering
Transactions on Computer Science & Engineering and Electrical Engineering
Transactions on Industrial Engineering
Transactions on Nanotechnology

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