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Sizes and anisometricity of micelles in lyotropic liquid crystalline mesophases : sodium lauryl sulphate/water/decanol lyotropic system / A. Nesrullajev in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 3/2010 (24/05/2010)
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Titre : Sizes and anisometricity of micelles in lyotropic liquid crystalline mesophases : sodium lauryl sulphate/water/decanol lyotropic system Type de document : texte imprimé Auteurs : A. Nesrullajev, Auteur Année de publication : 2010 Article en page(s) : p. 179-183 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Chimie-physique Micelles 'Cristal liquide lyotropique' Amphiphile 'Mésophase nématique-calamitique' hexgonale' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Structural peculiarities of the rod-like micelles in lyotropic liquid crystalline nematic-calamitic and hexagonal mesophases have been investigated. The lengths, the parameters of anisometricity, the form factors and the volumes of these micelles have been determined. The method of the electrical conductivity anisotropy in the orientational shear flow has been used. The rod-like micelles of nematic-calamitic and hexagonal mesophases were considered as the prolonged ellipsoids. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9469
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 3/2010 (24/05/2010) . - p. 179-183[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012189 - Périodique Bibliothèque principale Documentaires Disponible Kinetics and mechanism of nucleophilic xubstitution in SnR2Cl2 × 2DMSO by chloride ions in micellar microenvironment / Abdul Moheman in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 4 (07-08/2012)
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Titre : Kinetics and mechanism of nucleophilic xubstitution in SnR2Cl2 × 2DMSO by chloride ions in micellar microenvironment Type de document : texte imprimé Auteurs : Abdul Moheman, Auteur ; Seema Yadav, Auteur ; Khwaja Salahuddin Siddiqi, Auteur Année de publication : 2012 Article en page(s) : p. 287 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Surfactants 'Substitution nucléophilique' Solvatation' 'Dodécyle sulfate sodium' Micelles Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The kinetics of nucleophilic substitution of dimethylsulfoxide by chloride ion in bis-dimethyl sulfoxide dimethyltin(IV) dichloride and bis-dimethyl sulfoxide diphenyltin(IV) dichloride in micellar microenvironment (1.0 × 10–2M SDS in aqueous solution of ethanol (1:1, v/v) has been studied conductometrically. The reactions have been carried out at 25 °C. Substitution follows first order path with respect to chloride ion concentration. A millimolar solution of the complexes in ethanolic solution of 1.0 × 10–2M SDS shows an increase in conductance with time due to solvation of the molecule. Sn(CH3)2Cl2× 2 DMSO shows high conductance as compared to Sn(C6H5)2Cl2× 2 DMSO. In the presence of the nucleophilic reagents, C6H5COCl and CH3COCl there is a greater enhancement in conductance due to substitution of DMSO by chloride ion. The data of rate constant for solvation (KS) and for nucleophilic substitution (K1and K2) have been calculated. It was found that the solvation is a slower process compared to the substitution by chloride ions i. e., K1, K2> Ks. A possible mechanism has been suggested. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15546
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Code-barres Cote Support Localisation Section Disponibilité 14042 - Périodique Bibliothèque principale Documentaires Disponible Micellar catalysis on pentavalent vanadium ion oxidation of ethanol in aqueous acide media / Sumanta K. Ghosh in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 4 (07-08/2012)
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Titre : Micellar catalysis on pentavalent vanadium ion oxidation of ethanol in aqueous acide media Type de document : texte imprimé Auteurs : Sumanta K. Ghosh, Auteur ; Aniruddha Ghosh, Auteur ; Saha Rumpa, Auteur ; Kakali Mukherjee, Auteur ; Ankita Basu, Auteur ; Bidyut Saha, Auteur Année de publication : 2012 Article en page(s) : p. 296-299 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Cinétique Vanadium Ethanol 'Dodécyle sulphate sodium' 'Chlorure N-cetylpyridinium' 'Surfactant anionique' neutre 'Triton X-100' Catalyse Micelles Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Vanadium(V) oxidation of ethanol follows a first order dependency on the concentration of ethanol, vanadium(V), H+and HSO4 –. These observations remain unaltered in the presence of externally added surfactants. The effect of the cationic surfactant (i.e., N-cetylpyridinium chloride [CPC]), anionic surfactant (i.e., sodium dodecyl sulphate [SDS]) and neutral surfactant (i.e., Triton X-100 [TX-100]) has been studied. CPC inhibits the reactions, whereas SDS and TX-100 accelerate the reaction to different extents. Observed effects have been justified by considering the hydrophobic and electrostatic interaction between the surfactants and reactants. SDS and TX-100 can be used as catalysts in the production of acetaldehyde from ethanol. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15548
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 4 (07-08/2012) . - p. 296-299[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14042 - Périodique Bibliothèque principale Documentaires Disponible