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Conductometry and thermodynamic study of micellization of cetyltrimethylammonium bromide in mixed solvents containing dilute electrolyte solutions / H. J. Y. El-Aila in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)
[article]
Titre : Conductometry and thermodynamic study of micellization of cetyltrimethylammonium bromide in mixed solvents containing dilute electrolyte solutions Type de document : texte imprimé Auteurs : H. J. Y. El-Aila, Auteur Année de publication : 2011 Article en page(s) : p. 312-317 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Micellisation 'Concentration micellaire critique' 'Bromure cétyltriméthyle ammonium' Diméthylsulfoxyde Acétonitrile Ion Conductimétrie Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The critical micelle concentration (CMC) of Cetyltrimethyl ammonium bromide (CTAB) was determined conductometrically in binary mixtures of water + cosolvent at various temperatures and at low concentrations of sodium chloride, ranging from 0.0 to 2.4 × 10–2 M. Dimethylsulfoxide (DMSO) and acetonitrile (AN) were used as cosolvents added to water. The ability of NaCl to lower the CMC of CTAB in water was inhibited by DMSO and AN. Thermodynamic parameters of micellization ΔH0m, ΔS0m, and ΔG0m were evaluated according to the pseudo-phase model. The contribution of DMSO and AN in the micellization process of CTAB in aqueous electrolyte solutions were discussed in terms of the observed thermodynamic properties. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11951
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 312-317[article]Réservation
Réserver ce documentReduction of methylene blue by ascorbic acid : kinetic and thermodynamic aspects / H. J. Y. El-Aila in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)
[article]
Titre : Reduction of methylene blue by ascorbic acid : kinetic and thermodynamic aspects Type de document : texte imprimé Auteurs : H. J. Y. El-Aila, Auteur Année de publication : 2012 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu de méthylène
Cinétique chimique
Ions ascorbate
Micelles
Réduction (chimie)Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This article reports the reduction of methylene blue (MB) by ascorbic acid (H2As) in basic aqueous and micellar solutions. Ascorbate ion (As2–) is found to be an effective reducing agent for the decolorization of methylene blue under ambient condition. Effects of salting-in and salting-out agents have been investigated for real-time application in the reduction process. The salting-in agent urea has been found to uniquely enhance the rate of the reduction of MB by As2– in the presence of micelles. Detailed kinetic and thermodynamic aspects have been considered to realize the interaction between methylene blue and ascorbate ion. Kinetic studies revealed that the reaction follows pseudo first order reaction kinetics. Note de contenu : - EXPERIMENTAL : Materials and methods - Kinetics and instruments
- RESULTS AND DISCUSSION : Reduction of methylene blue by ascorbate ion in aqueous solution - Micellar catalysis - Effect of temperature - Effect of salting-in and salting-out agentPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13309
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 26-31[article]Réservation
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