- The inhibition performance of morpholinium derivatives on corrosion behavior of carbon steel in the acidized formation water: Theoretical, experimental and biocidal evaluations
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The aim of the present study is to synthesis and explore the inhibition influences of three morpholinium cationic surfactants (coded: MCS-10, MCS-12, and MCS-14) on the carbon steel corrosion in petroleum wells formation water containing 3 M HCl solution at different temperatures. The chemical structures of the synthesized compounds were confirmed by FTIR, 1HNMR analysis. The surface properties of the surfactants were investigated via the surface tension measurements. Inhibition efficiencies obtained from weight loss were in good agreement and they were up to 92.2, 92.8, and 93.1% for MCS-10, MCS-12, and MCS-14, respectively. The effect of temperature on the corrosion behavior of mild steel was studied in the range of 298–343 K. Villamil adsorption isotherm was found to be the more fitted model for the adsorption process description. Also, the biocidal activity for the synthesized morpholinium surfactants was studied. The parameters of DFT and molecular dynamic simulation were found adequately correlated with the obtained experimental results. Surface morphology study through scanning electron microscope (SEM) analysis showed a significant improvement on the surface morphology of the steel plate in the presence of MCS-14 in the corrosive solution.
- Abdallah, Hossam E.,Ali, Asmaa I.,Badr, Emad A.,El-Etre, A. Y.,Farag, Ahmed A.,Mohamed, Eslam A.
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- New Diesters Derived from Piperine: In silico Study and Evaluation of Their Antimicrobial Potential
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Piperine, previously extracted from black pepper (Piper nigrum L.), was used as a precursor for the synthesis of twelve new diester derivatives. The final products were obtained through the bimolecular nucleophilic substitution reaction (SN2) of the alkyl 2-chloroacetates and the salt of piperic acid, obtained from the basic hydrolysis of piperine. The compounds were synthesized with yields of 55-84% and characterized by infrared spectroscopy and 1H and 13C nuclear magnetic resonance. The evaluation of the compounds’ potential as new drug candidates was done through an in silico study of ADME properties (absorption, distribution, metabolization and excretion) and evaluation of antimicrobial activity against bacterial strains (Staphylococcus aureus and Pseudomonas aeruginosa), yeasts (Candida albicans and Candida tropicalis) and filamentous fungi (Aspergillus fumigatus, Aspergillus flavus and Aspergillus niger). The in silico study showed that the compounds were good drug candidates and antimicrobial evaluation demonstrated that 9 of the 12 compounds exhibited a minimum inhibitory concentration (MIC) ranging 1024-256 μg mL?1
- Barbosa-Filho, José M.,Brand?o, Maria Cláudia R.,Lima, Edeltrudes O.,Lira, Bruno F.,Neto, Hermes D.,Souza, Helivaldo D. S.,Trindade, Emmely O.,de Athayde-Filho, Petr?nio F.
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p. 1668 - 1678
(2020/10/09)
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- Novel synthesized Schiff Base-based cationic gemini surfactants: Electrochemical investigation, theoretical modeling and applicability as biodegradable inhibitors for mild steel against acidic corrosion
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Three novel Schiff base compounds were synthesized and characterized using spectroscopic methods (FT-IR, 1H NMR and 13C NMR). Their critical micelle concentrations were determined by conductimetric and surface tension measurements. The inhibition potentials of the prepared surfactants on mild steel corrosion in H2SO4 have been investigated using electrochemical and scanning electron microscopy techniques. The results showed that all surfactants are good inhibitors for mild steel corrosion with the percentage inhibition efficiency of up to 99.21% at 1.0?mM. The data showed that the studied surfactants are mixed-type inhibitors. Adsorption of the inhibitors obeyed the Langmuir isotherm. The results obtained from theoretical calculations support our experimental studies.
- Abd El-Lateef, Hany M.,Soliman, Kamal A.,Tantawy, Ahmed H.
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p. 478 - 498
(2017/03/11)
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- Synthesis and physico-chemical properties of ionic liquids—3-methyl-1-alkyloxycarbonylmethylpyridinium hexafluorophosphates
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Ionic liquids based on 1-alkyloxycarbonylmethyl-3-methylpyridinium and Cl– and PF6 – anions have been synthesized. The conductivity of their solutions in acetonitrile and the thermal stability over 25–500°C in air have been determined.
- Zhuravlev,Voronchikhina
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p. 940 - 944
(2017/06/28)
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- Synthesis and evaluation of novel series of Schiff base cationic surfactants as corrosion inhibitors for carbon steel in acidic/chloride media: Experimental and theoretical investigations
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A new family of Schiff base cationic surfactants (CSSB) having various alkyl chain lengths were prepared and their chemical structure was elucidated by using different spectroscopic techniques (FTIR, 13C-NMR and 1H-NMR). The surface activity parameters of the prepared surfactants were measured to set the adsorption and micellization characteristics at the water/air interface. The corrosion inhibition capability of these surfactants was investigated on a carbon steel surface in 3.5% NaCl+ 0.5 M HCl solutions at different temperatures (30-60 °C) by potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The results revealed that CSSB compounds inhibited corrosion of carbon steel in the investigated acidic chloride containing environment. It was found that the inhibition efficiency increases with an increase in inhibitor concentrations and decreases with increasing temperature. Polarization data indicated that the investigated compounds act as mixed-type inhibitors, and the adsorption isotherm basically obeys the Langmuir isotherm. The corrosion inhibition mechanism was discussed based on the potential of zero charge value. An SEM/EDX studies confirmed that CSSB inhibitors could form films by adsorption on the carbon steel surface. The theoretical predictions exhibit good agreement with empirical results.
- Abd El-Lateef, Hany M.,Tantawy, Ahmed H.
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p. 8681 - 8700
(2016/02/05)
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- Synthesis and surface active properties of gemini cationic surfactants and interaction with anionic azo dye (AR52)
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A homologous series of new gemini cationic surfactants were synthesized and characterized using micro elemental analysis, FTIR, 1H-NMR and mass spectra. The surface activities of these amphiphiles were determined based on the data of surface tension. Critical micelle concentration, effectiveness of the surface tension reduction, efficiency of adsorption, maximum surface excess, minimum surface area and critical packing parameter were evaluated. The effect of cationic micelles on solubilization of anionic azo dye, sulforhodamine B (Acid Red 52) in aqueous micellar solution of the synthesized gemini cationic surfactants was studied at pH 6.9 ± 0.5 and 25°C. The results showed that the solubility of dye rose with increasing surfactant concentration as a consequence of some association between the dye and the micelles. It was also observed that the aggregation of surfactant and dye takes place at a surfactant concentration below the CMC of the individual surfactant. The partition coefficients between the bulk water and surfactant micelles as well as the Gibbs energies of distribution of dye between the bulk water and surfactant micelles were calculated using a pseudo-phase model. The effect of the hydrophobic chain length of Gemini cationic surfactants on the distribution parameters was also reported. The results show favorable solubilization of dye in cationic micelles. AOCS 2011.
- Abdel-Salam, Fatma H.,El-Said, Asrar G.
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experimental part
p. 371 - 379
(2012/07/14)
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- Carboxylic acids supported on silica: A smooth acylating agent for alcohols
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An alternative procedure for the esterification of alcohols by short-chain carboxylic acids supported on silica is presented.
- Da Graca Nascimento, Maria,Zanotto, Sandra Patricia,Scremin, Marivania,Rezende, Marcos Caroli
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p. 2715 - 2721
(2007/10/03)
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- Effect of Molecular Association on the Rates of Hydrolysis of Long-Chain Alkyl Betainates (Alkoxycarboxyl-N,N,N-Trialkylmethanaminium Halides)
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Alkaline hydrolysis of long-chain alkyl betainates (alkoxycarbonyl-N,N,N-trialkylmethanaminium halides) is accelerated by molecular aggregation leading to micellization.With increasing length of the alkyl chain, the observed rate constants shows an increased concentration dependence and increased deviation from pseudo first-order kinetics at constant pH.The rate constant reached a maximum at an ester concentration close to the estimated critical micelle concentration.Thus, at a ca. 400 μM ester concentration the C14 compound was hydrolyzed roughly ten times faster than its C3 analogue, while extrapolation to zero concentration gave virtually identical rate constants.The results are best interpreted by means of the pseudo-phase ion-exchange model.
- Thompson, Richard A.,Allemark, Stig
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p. 690 - 693
(2007/10/02)
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- Micellar properties of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in water
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Viscosity, conductivity, density, and fluorescence quenching studies were conducted in aqueous micellar solutions at 25.0 deg C of sodium alkyl sulfoacetates and sodium dialkyl sulfosuccinates in a comparison of one-tailed and two-tailed surfactant systems.The hexyl, octyl, and decyl members of the former group and the dihexyl and dioctyl members of the latter group were investigated.The results indicated that the sulfoacetates most likely form spherical micelles with aggregation numbers 20 for hexyl, 42 for octyl, and 70 for decyl with three methods for size determination giving concordant results.For the sulfosuccinates, the aggregation numbers from fluorescence quenching were 38 for the dihexyl and 56 for the dioctyl in agreement with the results from the conductance technique which means that spherical micelles are likely formed also.Volume changes on micellization were obtained for the sulfoacetates.
- Jobe, David J.,Reinsborough, Vincent C.
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p. 280 - 284
(2007/10/02)
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