Dissolution Rate of Sodium Fatty Alcohol Sulfate FAS – Surfactants / R. Abdel-Rahem in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 5/2007 (10-11/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 5/2007 (10-11/2007) . - p. 260-265 Titre : Dissolution Rate of Sodium Fatty Alcohol Sulfate FAS – Surfactants Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur ; Jibril Al-Hawarin, Auteur Année de publication : 2007 Article en page(s) : p. 260-265 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Rate  of  dissolution  Fatty  alcohol  sulfates  Gel  like  layer Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : We represent an applicable problem that arises when long chain surfactant fatty alcohol sulfate FAS is used in washing process. Octadecyl fatty alcohol sulfate C18-FAS is known for its strong washing performance, however it has the disadvantages of high Krafft point and its long dissolution rate. We demonstrate the factors that affect dissolution rates of FAS-surfactants, and how one can vary these factors in order to achieve particular dissolution rate. In this study, we have used a reproducible method for determining the rate of dissolution of anionic surfactants tablet and the effect of, temperature, hardness of FAS-tablets, stirring rate, FAS chain length, mixing with other surfactants and additives on the rate of dissolution of FAS have been studied. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3200 [article]

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The influence of surfactant’s synergism on the solubilization of some fluorescent compounds / R. Abdel-Rahem in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 6 (11-12/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 6 (11-12/2011) . - p. 445-452 Titre : The influence of surfactant’s synergism on the solubilization of some fluorescent compounds Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur ; A. A. Abdel-Shafi, Auteur ; Jibril Al-Hawarin, Auteur ; A. S. Ayesh, Auteur Année de publication : 2011 Article en page(s) : p. 445-452 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés fluorés Solubilisation Surfactants fluorés Synergie Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Aqueous solutions of anionic surfactant sodium dodecylsulfate (SDS) and cationic surfactant cetyltrimethyammonium bromide (CTAB) were prepared at room temperature in order to investigate the influences of surfactants mixing on the solubilization of 2-naphthol-6-sulfonate and toluene. The phase behavior of CTAB/SDS was firstly investigated to obtain the optimum ratio of CTAB/SDS that result in an isotropic solution before reaching the two phase region. From the conductivity and surface tension measurements, the critical micelle concentrations (CMC) of single and mixed surfactant solutions were obtained and the interaction parameter (β) were evaluated. Water solubility enhancement of (0 – 3 wt.%) toluene by micellar solutions of single surfactant SDS, CTAB and mixed solutions of SDS-CTAB surfactants were then investigated by establishing the phase behavior and measuring the absorption and the emission spectra of these solutions. The toluene was completely solubilized by the micellar solution of single surfactants, whereas turbidity was observed at toluene concentration of about 1.5 wt.% in the micellar solution of SDS-CTAB. The fluorescence behavior of 2-naphthol-6-sulfonate (2NO6S) and toluene in the single and mixed surfactant solutions was also compared. The solubilization of toluene in surfactant solutions was explained in terms of hydrophobic interaction occurring within the surfactant core and the palisade layers. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12612 [article]

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