A structural study of two oxyethylene alkyl ether-water mesophase systems in the presence of small amount of sodium dodecyl sulphate, SDS ionic surfactant / Moussa Alibrahim in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 47, N° 6/2010 (11-12/2010)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 47, N° 6/2010 (11-12/2010) . - p. 402-407 Titre : A structural study of two oxyethylene alkyl ether-water mesophase systems in the presence of small amount of sodium dodecyl sulphate, SDS ionic surfactant Type de document : texte imprimé Auteurs : Moussa Alibrahim, Auteur Année de publication : 2010 Article en page(s) : p. 402-407 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cristaux liquides Diffusion aux petits angles Ions Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Two structural studies of the following two liquid crystals systems: [(C12EO4 + 1% SDS)/H2O, ca. 25–85 wt.% surfactant] and [(C12EO8 + 1% SDS)/H2O, ca. 40–71 wt.% surfactant] have been investigated. Both previous systems contain similar amount of Sodium Dodecyl Sulphate, SDS. It has been found that there are two mesophases at 25°C: the lamellar Lα and the hexagonal H1. Their structural parameters were determined using small angle X-ray scattering (SAXS) patterns. The mesophases study of the Lα and H1 regions allows the evolution description of the surfactant chains conformation. The geometrical parameters of the Lα and H1 mesophases such as the thickness of hydrocarbon core of the lamellar mesophase and the diameter of rods forming the hexagonal structure were calculated. In the lamellar, Lα and the hexagonal, H1 mesophases, the surface area per molecule and the thickness of the hydrocarbon core exhibited a little sensitivity change toward concentration. The thickness of the ethoxy groups was estimated in Lα and H1 mesophases as a function of surfactant concentration in (C12EO4 + 1% SDS)/H2O and (C12EO8 + 1% SDS)/H2O systems at 25°C, respectively. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10301 [article]

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Study of the cloud point of C12EO6 and C12EO8 nonionic surfactants : effect of additives / Moussa Alibrahim in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 4 (07-08/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 4 (07-08/2012) . - p. 330-334 Titre : Study of the cloud point of C12EO6 and C12EO8 nonionic surfactants : effect of additives Type de document : texte imprimé Auteurs : Moussa Alibrahim, Auteur Année de publication : 2012 Article en page(s) : p. 330-334 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : C12E06  C12EO8  Additifs  Micelle  Surfactants  'Point  trouble' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Significant change in the cloud point of the nonionic surfactant solutions is observed by adding foreign substance. The aqueous solutions of these surfactants show complex phase behaviour including liquid-liquid separation at higher temperature. Electrolytes as well as nonelectrolytes have a large effect on the cloud point (CP) of C12EO6and C12EO8nonionic surfactants, because of their effect on water structure and their hydrophilicity. The presence of NaI and KI in the systems leads to a substantial increase in the cloud point of 2 wt% of the C12EO6and C12EO8solutions, but the increase is relatively less with KI than with NaI. Moreover, the cloud point decreases in the presence of NaF, NaCl and NaBr, and also similar identical observation was seen in the cloud point with KF, KCl and KBr, respectively. Furthermore, the results show that the addition of the tetramethyl ammonium bromide (TMABr) decreases the cloud point of the C12EO6and C12EO8, whereas the addition of tetrabutyl ammonium iodide (TBAI) increases the cloud point of the above systems. The clouding phenomenon of the aqueous C12EO6and C12EO8systems in the presence of various additives is discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15553 [article]

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