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Bis (diquaternary ammonium)salts : synthesis, effect of spacer on surface activities and aggregation properties of reactive red 198 in aqueous – surfactants solutions / Fatma H. Abdel-Salam in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 3/2011 (05/2011)
[article]
Titre : Bis (diquaternary ammonium)salts : synthesis, effect of spacer on surface activities and aggregation properties of reactive red 198 in aqueous – surfactants solutions Type de document : texte imprimé Auteurs : Fatma H. Abdel-Salam, Auteur ; A. G. El-Said, Auteur Année de publication : 2011 Article en page(s) : p. 239-248 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ammoniums quaternaires
Chimie des surfaces
Colorants réactifs
Précipitation (chimie)
SurfactantsTags : Synthèse 'Surfactants gémini cationiques' 'Propriétés surface' Aggrégation 'Comportement pigment réactif rouge 198' (RR 198) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A series of bis-diquaternary ammonium salts (cationic Gemini surfactants) with different length in spacer were prepared and characterized. The surface properties such as the critical micelle concentration CMC, minimum surface tension γCMC, effectiveness of the surface tension reduction πCMC, maximum surface excess Γmax and surface area per molecule Amin have been determined by means of surface tension measurements. As expected, these surfactants have good surface activities than those conventional monomeric ones (dodecyl trimethyl ammonium chloride (DTAC)) and the spacer plays an important role in the surface properties. Under experimental conditions, surface parameters decreases with the increase of carbon number of the spacer the except analogue with a benzene ring due to its inflexibility. The aggregation ability of some practically used reactive azodyes (C. I. Reactive Red 198) in aqueous solutions and the prepared surfactants was investigated using UV-visible spectroscopic methods. The spectroscopic studies were extended in order to determine the effect of molecular structure of the surfactants on the aggregative properties of C. I. Reactive Red 198 (RR 198). The aggregation behaviour of the RR 198 in solutions and in the presence of additives is related to their apparent deviations from Beer’s law and aggregation number (N). The aggregation constant (Kn) of the monomer/dimer equilibrium was calculated. The aggregate structures and the nature of the interacting pairs in this dye were discussed using Kasha exciton theory. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Methods - Synthesis - Measurements.
- RESULTS AND DISCUSSION : Structure characterization - Critical micelle concentration (CMC) - Adsorption on the air/solution interface - Aggregation of RR 198 under different concentration in aqueous solution - Aggregative properties of RR 198 dye in aqueous-surfactant solution - Molecular excitation of dimer structure of RR 198.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11706
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 3/2011 (05/2011) . - p. 239-248[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012974 - Périodique Bibliothèque principale Documentaires Disponible Observation of the sweating in lipstick by scanning electron microscopy / S.-Y. Seo in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 21, N° 3 (06/1999)
[article]
Titre : Observation of the sweating in lipstick by scanning electron microscopy Type de document : texte imprimé Auteurs : S.-Y. Seo, Auteur ; I.-S. Lee, Auteur ; H.-Y. Shin, Auteur ; K.-Y. Choi, Auteur ; S.-H. Kang, Auteur ; H.-J. Ahn, Auteur Année de publication : 1999 Article en page(s) : p. 207–216 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Transpiration dans le rouge à lèvres' 'Microscopie électronique balayage' (MEB) 'Matrice de cire' 'Procédé substitution gel' Index. décimale : 668.5 Parfums et cosmétiques Résumé : The relationship between the wax matrix in lipstick and sweating has been investigated by observing the change of size and shape of the wax matrix due to sweating by Scanning Electron Microscopy (SEM). For observation by SEM, a lipstick sample was frozen in liquid nitrogen. The oil in the lipstick was then extracted in cold isopropanol (−70 °C) for 1–3 days. After the isopropanol was evaporated, the sample was sputtered with gold and examined by SEM. The change of wax matrix underneath the surface from fine, uniform structure to coarse, nonuniform structure resulted from the caking of surrounding wax matrix. The oil underneath the surface migrated to the surface of lipstick with sweating; consequently the wax matrix in that region was rearranged into the coarse matrix. In case of flamed lipstick, sweating was delayed and the wax matrix was much coarser than that of the unflamed one. The larger wax matrix at the surface region was good for including oil. The effect of molding temperature on sweating was also studied. As the molding temperature rose, sweating was greatly reduced and the size of the wax matrix increased. It was found that sweating was influenced by the compatibility of wax and oil. A formula consisting of wax and oil that have good compatibility has a tendency to reduce sweating and increase the size of the wax matrix. When pigments were added to wax and oil, the size of the wax matrix was changed, but in all cases sweating was increased due to the weakening of the binding force between wax and oil. On observing the thick membrane of wax at the surface of lipstick a month after molding it was also found that sweating was influenced by ageing. In conclusion, the structure of the wax matrix at the surface region of lipstick was changed with the process of flaming, molding temperature, compatibility of wax and oil, addition of pigment, and ageing. In most cases, as the size of the wax matrix was increased, sweating was reduced and delayed. DOI : 10.1046/j.1467-2494.1999.181705.x En ligne : https://onlinelibrary.wiley.com/doi/10.1046/j.1467-2494.1999.181705.x Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26492
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 21, N° 3 (06/1999) . - p. 207–216[article]