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Tennouga L.,Abou Bekr Belkaid University Tlemcen | Mansri A.,Abou Bekr Belkaid University Tlemcen | Medjahed K.,Abou Bekr Belkaid University Tlemcen | Chetouani A.,University Mohammed Premier | And 2 more authors.
Journal of Materials and Environmental Science | Year: 2015

In this paper, the micellization of anionic surfactant sodium dodecyl sulphate (SDS) and cationic surfactant Ndodecylpyridinium chloride (DPC) in aqueous solution at various temperatures has been reported using conductivity measurements. The thermodynamic parameters of micellization; the free energy, ΔGmic 0, the enthalpy, ΔHmic 0, and the entropy, ΔSmic 0 were calculated from the critical micelle concentration (CMC) at different temperatures. The results show that the CMC of surfactants decreases to reach a minimum and then increases with temperature. Also, the thermodynamic parameters of micellization are discussed. Source


El Azzouzi M.,University Mohammed Premier | Aouniti A.,University Mohammed Premier | Herrag L.,University Mohammed Premier | Chetouani A.,University Mohammed Premier | And 4 more authors.
Der Pharma Chemica | Year: 2015

The inhibition effect of 3-(4-Hydroxyphenylamino) propanenitrile (Para) and 3-(2-Hydroxyphenylamino) propanenitrile (ortho) on the corrosion of steel mild 1M HCl solution was studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy methods. The results revealed that corrosion rate depends on the molecular structure and the concentration of inhibitors. We found that the Para Hydroxyphenylamino propanenitrile is a good inhibitor and has been tested with efficiency reaches to 85% in 10-3 M. Polarization studies through electrochemical curves and spectroscopy of electrochemical impedance clearly show that 3-(4-Hydroxyphenylamino) propanenitrile is a mixed inhibitor. The adsorption of Ortho and Para inhibitors on the mild steel surface obeys Langmuir isotherm. Both thermodynamic parameters (adsorption heat ΔH°, adsorption free energy ΔG° and adsorption entropy ΔS°) and kinetic parameters (apparent activation energy Eα) were calculated and discussed. The quantum chemical parameters calculated using DFT at the B3LYP/6-31G* level of theory show a good correlation to the inhibition efficiency. The highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), the separation energy (ΔE) and the dipole moment (μ) from the inhibitor to the metal surface explain well experimental data. Source


Mokhtari O.,University Sidi Mohammed Ben Abdellah | Hamdani I.,University Mohammed Premier | Chetouani A.,University Mohammed Premier | Chetouani A.,Center Regionale Des Metiers Of Leducation Et Of Formation Crmef | And 4 more authors.
Journal of Materials and Environmental Science | Year: 2014

The effects of natural Jatropha curcas oil on the corrosion of steel in molar hydrochloric acid were studied via the measurements of weight loss, electrochemical and EIS polarisation. The results obtained revealed that Jatropha curcas oil reduced the rate of corrosion. The corrosion inhibition efficiency increased with the increase of inhibitor concentration. Potentiodynamic polarisation studies clearly revealed that the presence of the natural Jatropha curcas oil did not alter the mechanism of the hydrogen evolution reaction and acted a mixed inhibitor. The adsorption of Jatropha curcas oil on the steel surface in molar in hydrochloric acid obeys to the Frumkin adsorption isotherm model. Source


Bouhrira K.,Oran University of Science and Technology - Mohamed Boudiaf | Chetouani A.,University Mohammed Premier | Chetouani A.,Center Regionale Des Metiers Of Leducation Et Of Formation Crmef | Zerouali D.,Oran University of Science and Technology - Mohamed Boudiaf | And 5 more authors.
Research on Chemical Intermediates | Year: 2014

This work reports results from potentiodynamic polarisation and impedance investigation, with a rotating disc electrode, of inhibition of corrosion of A106 steel in aerated, unstirred 3.0 % NaCl solutions using di-n-butyl bis(thiophene-2-carboxylato-O,O′)tin(IV) as inhibitor. These studies showed that it is a mixed-type inhibitor. Inhibition efficiency increased with increasing di-n-butyl bis(thiophene-2-carboxylato-O,O′)tin(IV) concentration and decreases with increasing solution temperature. Maximum efficiency of inhibition of the inhibitor of approximately 78 % is observed at a concentration at 10-2 M. The inhibition process was attributed to formation of an adsorbed film on the metal surface that protects the metal against corrosive agents. The adsorption isotherm confirms the applicability of Langmuir equation to describe the adsorption process. Thermodynamic functions for the adsorption process were determined. The efficiency of corrosion inhibitors and global chemical reactivity depend on such properties as energy of the highest occupied molecular orbital (E HOMO), energy of the lowest unoccupied molecular orbital (E LUMO), energy gap (ΔE), which were calculated. All calculation was been performed by density functional theory (DFT) using the Gaussian03W suite of software. Calculated results were usually in agreement with the experimental data. © 2013 Springer Science+Business Media Dordrecht. Source


Elmsellem H.,University Mohammed Premier | Youssouf M.H.,University Mohammed Premier | Aouniti A.,University Mohammed Premier | Ben Hadda T.,University Mohammed Premier | And 3 more authors.
Russian Journal of Applied Chemistry | Year: 2014

The inhibition effect of curcumin on the corrosion of mild steel in 1.0 M HCl solution was studied by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods. The experimental results suggest that this compound is an efficient corrosion inhibitor and the inhibition efficiency increases with the increase in inhibitor concentration. Adsorption of this compound on mild steel surface obeys Langmuir isotherm. Also the objective of this work is to attempt to find relationships between electronic structure and inhibition efficiency. The structural parameters, such as the frontier molecular orbital energies (E HOMO and E LUMO), gap of energy ΔE, from the molecule to iron as well as electronic parameters such as Mulliken atomic populations were calculated and discussed using the Density Functional Theory method (DFT). © 2014 Pleiades Publishing, Ltd. Source

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