Physiochemical Properties of Hydroxy Mixed Ether HMEn Surfactants and their Interaction with Sodium Dodecyl Sulfate SDS / R. Abdel-Rahem in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 2/2009 (02-03/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 2/2009 (02-03/2009) . - p. 105-111 Titre : Physiochemical Properties of Hydroxy Mixed Ether HMEn Surfactants and their Interaction with Sodium Dodecyl Sulfate SDS Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur ; A. S. Ayesh, Auteur Année de publication : 2009 Article en page(s) : p. 105-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Microscopie à force atomique Sodium -- Composés organiques Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This paper is focused on the phase behavior, interaction with anionic surfactant sodium dodecyl sulfate SDS, adsorption and wetting investigations of new hydroxy mixed ether nonionic surfactants HMEn. The phase diagrams of (0.1–100) %wt of HMEn (n-value is the ethoxylation number EO) at the temperature range 20–100°C have shown that the increasing of n-value raises the cloud boundary toward higher temperature. Remarkable result was obtained from the interaction between SDS and HMEB, at which the mixed system exhibits a unique homogeneity and a liquid crystal phase formation. Macroscopically, the liquid crystal region was found when the SDS concentration range between 8 and 24 mM mixed with 10% wt HMEB. The interaction between HMEn and mica was also investigated using atomic force microscopy AFM and a pronounced adsorption of HMEn on mica was observed. Moreover, contact angle results reveal that glass substrate shows strong wettability of HMEn surfactant solutions compared with polyethylene PE and polymethylmethaacrylate PMMA substrates. This wettability however also decreases with EO number. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4579 [article]

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Surface activity of newly nonionic surfactants at air/water interface and their interaction with clay and teflon / R. Abdel-Rahem in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 45, N° 3/2008 (05-06/2008)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 45, N° 3/2008 (05-06/2008) . - p. 137-143 Titre : Surface activity of newly nonionic surfactants at air/water interface and their interaction with clay and teflon Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur ; A. S. Ayesh, Auteur Année de publication : 2008 Article en page(s) : p. 137-143 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Argile Chimie des surfaces Interfaces gaz-liquide Polytétrafluoréthylène Saponite Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The surface activity of newly nonionic hydroxyl mixed ether surfactants HMEn at air/water and solid/water interfaces was studied as a function of ethoxylation degree (n-value). The characteristics of this series of nonionic surfactant, including surface tension, critical micelle concentration cmc, adsorption onto hydrophilic saponite clay and hydrophobic Teflon are reported. The surface tension results indicate that cmc, surface tension after gamma-cmc, and the minimum surface area per adsorbed HME-surfactant molecule Amin are all increased with n-value. Results of static light scattering are in agreements with those obtained using surface tension method. For HME-surfactants, strong adsorption measured by surface tension onto the hydrophilic synthetic clay mineral saponite. This result was also observed by atomic force microscopy AFM for HME9.7 onto hydrophilic mica surface. On the other hand, the adsorption of HME-surfactant onto hydrophobic polytetraflouroethylene PTFE (Teflon) is less than that measured onto saponite. However, the adsorption at both surfaces has the same dependency on n-value. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3047 [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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