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Search Results: 1 - 10 of 503395 matches for " A.Y; EL-MOSSALAMY "
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ELECTROCHEMICAL INVESTIGATION OF CYSTEAMINE AT CARBON FIBER MICRODISK ELECTRODE
IS EL-HALLAG,A.O AL-YOUBI,A.Y OBAID,E.H EL-MOSSALAMY
Journal of the Chilean Chemical Society , 2011,
Abstract: The electrooxidation of cysteamine compound was carried out using convolutive cyclic voltammetry, linear sweep voltammetry and chronoamperomtry techniques at a carbon fiber microdisk electrode in 0. 1 M perchloric acid. The electrooxidation potential (E0'' ) of cysteamine occurs at + 0.921 V. The mechanistic pathway of electrooxidation process at carbon fiber microelectrode is loss of 1 electron per molecule. The electrode process is controlled mainly by diffusion. The chemical and electrochemical parameters of the investigated system were determined experimentally and verified theoretically via digital simulation method.
ELECTROCHEMICAL INVESTIGATION OF CYSTEAMINE AT CARBON FIBER MICRODISK ELECTRODE
EL-HALLAG,IS; AL-YOUBI,A.O; OBAID,A.Y; EL-MOSSALAMY,E.H; EL-DALY,S.A; ASIRI,A.M;
Journal of the Chilean Chemical Society , 2011, DOI: 10.4067/S0717-97072011000400003
Abstract: the electrooxidation of cysteamine compound was carried out using convolutive cyclic voltammetry, linear sweep voltammetry and chronoamperomtry techniques at a carbon fiber microdisk electrode in 0. 1 m perchloric acid. the electrooxidation potential (e0'' ) of cysteamine occurs at + 0.921 v. the mechanistic pathway of electrooxidation process at carbon fiber microelectrode is loss of 1 electron per molecule. the electrode process is controlled mainly by diffusion. the chemical and electrochemical parameters of the investigated system were determined experimentally and verified theoretically via digital simulation method.
Non-Isothermal Degradation and Kinetics Studies of Some Quinaldine Azo Dye Complexes  [PDF]
L. M. Al-Harbi, E. H. El-Mossalamy, I. S. Ahmed, A. Y. Obaid
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.49053
Abstract:

4-(R-Phenylazo)-2-methyl quinoline derivatives form (1:1) complexes with nickel chloride, nickel acetate and copper acetate which were syntheses. The three complexes are non-electrolyte in dimethylsulfoxide (DMF). The results of electronic and magnetic measurements show that these complexes are of octahedral structures. The oxygen and nitrogen donate their lone-pair electrons to metal ion to form chelates with formula [MLRm.nH2O]. The relative stabilities of the complexes have been calculated from TG curve using Coats-Redfern and Ozawa methods.

Thermal Decomposition of Some Cardiovascular Drugs (Telmisartane, Cilazapril and Terazosin HCL)  [PDF]
L. M. Al-Harbi, E. H. El-Mossalamy, A. Y. Obaid, M. A. EL-RIES
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.47042
Abstract:

Thermal analysis of some antihypertensive drugs, Telmisartan, Cilazapril and Terazosin HCL was achieved. Thermogravimetry, derivative thermogravimetry and differential thermal analysis were used through the work. Thermogravimetric parameters such as activation energy, frequency factor and reaction order were calculated. The results show the stability value decrease in the order Telmisartan > Cilazapril > Terazosin. This method can be used in the quality control of pharmaceutical compounds because it is simple, fast and cheap.

Growth of Zinc Oxide (ZnO) Nanorods and Their Optical Properties
L.M. AL-Harbi,E. H. El-Mossalamy,H.M. Arafa,A. Al-Owais
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n2p87
Abstract: We herein, report growth of zinc oxide nanorods by a simple reaction of zinc powder and de-ionized water at very low temperature of ~ 110oC without using any organics. The formation of nanorods by the reaction of metals with water is suggested to occur due to the decomposition of water. The decomposed water produces controlled supply of OH- which further reacts with metal to form ZnO and releases hydrogen. The synthesized ZnO products were characterized in terms of their structural and optical properties. It was observed that the grown nanorods possess good optical property. Compared with other methods, the present method is simple, soft, inexpensive and environmentally benign which will make it suitable for large-scale production for devices and other applications.
TiO2 Nanoparticles with Tetra-pad Shape Prepared by an Economical and Safe Route at very Low Temperature
L.M. AL-Harbi,E. H. El-Mossalamy,H.M. Arafa,A. Al-Owais
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n3p130
Abstract: We report an organics free and safe route for the preparation of titanium dioxide (TiO2) nanoparticles having tetrapad shape. The approach is based on a very simple reaction of titanium powder and de-ionized water at very low temperatures of ~140oC without using any organics or surfactants. By the morphological investigations using FESEM and HRTEM, it was observed that the grown products are having tetrapad shape with the diameters in the range of 10-50nm. The EDS and XRD pattern confirmed the composition and crystallinity of the grown nanoparticles and revealed that the grown products are pure TiO2 with the tetragonal anatase phase. Since only water, which is regarded as a benign solvent is used during the preparation of nanoparticles, we believe that the product so produced is biocompatible and bio-safe and can be readily used for food and medicine. Besides other advantages, the present method is economical, fast, low temperature, free of pollution and environmentally benign which will make it suitable for large scale production.
Potentiometric and Spectroscopic Studies of Sulfonamide Azo-Dye Complexes with some Transition Metal Ions and Uranium
El-Mossalamy,E.H.;
Portugaliae Electrochimica Acta , 2009,
Abstract: molecular structure of the azo-dye derived from sulfonamide was synthesized. the elucidation of ligand and complex structures were studied by electronic, infrared and 1h nmr spectroscopies.proton-ligand constants of sulphonamid azo-derivatives and the stability constant of mo (iii), vo (ii), uo2 (ii) and co (ii) metal ions with sulfonamide azodye derivatives have been determined potentiometrically in 0.1 m kcl and 30% (v/v) ethanol-water mixture. the data are discussed in terms of the electronic character of the substituents and of the change in temperature. the pk1-h values have been found to increase with increasing electron donating nature of the subsituents. the evaluated dissociation processes are non spontaneous, endothermic and entropically unfavourable. the order of the stability constants of the formed complexes was found to be mo3+ > vo2+ > uo22+ > co2+. the influence of substituents on the stability of the complexes was examined on the basis of an electron repelling property of the substituent. the effect of temperature on the stability of the formed complexes was studied and the corresponding thermodynamic parameters (dg, dh and ds) were evaluated and discussed. the stoichiometries of these complexes were determined conductometrically and indicated the formation of 1:1 and 1:2 (metal:ligand) complexes.
Potentiometric and Spectroscopic Studies of Sulfonamide Azo-Dye Complexes with some Transition Metal Ions and Uranium
E.H. El-Mossalamy
Portugaliae Electrochimica Acta , 2009,
Abstract: Molecular structure of the azo-dye derived from sulfonamide was synthesized. The elucidation of ligand and complex structures were studied by electronic, infrared and 1H NMR spectroscopies.Proton-ligand constants of sulphonamid azo-derivatives and the stability constant of Mo (III), VO (II), UO2 (II) and Co (II) metal ions with sulfonamide azodye derivatives have been determined potentiometrically in 0.1 M KCl and 30% (v/v) ethanol-water mixture. The data are discussed in terms of the electronic character of the substituents and of the change in temperature. The pK1-H values have been found to increase with increasing electron donating nature of the subsituents. The evaluated dissociation processes are non spontaneous, endothermic and entropically unfavourable. The order of the stability constants of the formed complexes was found to be Mo3+ > VO2+ > UO2(2+) > Co2+. The influence of substituents on the stability of the complexes was examined on the basis of an electron repelling property of the substituent. The effect of temperature on the stability of the formed complexes was studied and the corresponding thermodynamic parameters (DG, DH and DS) were evaluated and discussed. The stoichiometries of these complexes were determined conductometrically and indicated the formation of 1:1 and 1:2 (metal:ligand) complexes.
Inhibition of metallic corrosion using ficus extract
El-Etre,A.Y.; El-Tantawy,Z.;
Portugaliae Electrochimica Acta , 2006,
Abstract: the inhibitive action of the extract of ficus nitida leaves toward general and pitting corrosion of c-steel, nickel and zinc in different aqueous media was investigated. weight loss measurements, potentiostatic and potentiodynamic polarization techniques were used in this study. it was found that the presence of ficus extract in the corrosive media (acidic, neutral or alkaline) decreases the corrosion rates of the three tested metals. the inhibition efficiency increases as the extract concentration is increased. the inhibition efficiency depends on the type of corroded metal and on the corrosive solution. it was also found that the presence of ficus extract in the chloride containing solution shifts the pitting potentials of the tested metals toward the noble direction. the inhibitive action of ficus extract is discussed in view of adsorption of its components, the poly aromatic compounds, friedelin, epifriedelanol and nitidol, on the metal surface. it was found that such adsorption follows langmuir adsorption isotherm. the calculated values of the free energy of adsorption indicated that the adsorption process is spontaneous.
Inhibition of metallic corrosion using ficus extract
A.Y. El-Etre,Z. El-Tantawy
Portugaliae Electrochimica Acta , 2006,
Abstract: The inhibitive action of the extract of Ficus nitida leaves toward general and pitting corrosion of C-steel, nickel and zinc in different aqueous media was investigated. Weight loss measurements, potentiostatic and potentiodynamic polarization techniques were used in this study. It was found that the presence of ficus extract in the corrosive media (acidic, neutral or alkaline) decreases the corrosion rates of the three tested metals. The inhibition efficiency increases as the extract concentration is increased. The inhibition efficiency depends on the type of corroded metal and on the corrosive solution. It was also found that the presence of ficus extract in the chloride containing solution shifts the pitting potentials of the tested metals toward the noble direction. The inhibitive action of ficus extract is discussed in view of adsorption of its components, the poly aromatic compounds, friedelin, epifriedelanol and nitidol, on the metal surface. It was found that such adsorption follows Langmuir adsorption isotherm. The calculated values of the free energy of adsorption indicated that the adsorption process is spontaneous.
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