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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Formation of multilamellar vesicles in the systems of decyltrimethylammonium hydroxides/2-hydroxy 1-carboxynaphthoate and octyltrimethylammonium hydroxides/2-hydroxy 1-carboxynaphthoate / R. Abdel-Rahem in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 3/2007 (06-07/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 3/2007 (06-07/2007) . - p. 168-175 Titre : Formation of multilamellar vesicles in the systems of decyltrimethylammonium hydroxides/2-hydroxy 1-carboxynaphthoate and octyltrimethylammonium hydroxides/2-hydroxy 1-carboxynaphthoate Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur Année de publication : 2007 Article en page(s) : p. 168-175 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Alkyltrimethylammonium  hydroxides  2-hydroxy-1-carboxy-naphthoate  Multilamellar  vseicles  Viscoelastic  surfactants  Yield  stress Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : We have investigated the phase behavior and characterized the microstructure of the phases that result from mixing of alkyltrimethylammonium hydroxides CxTAOH (x = 10.8) with 2-hydroxy 1-carboxy-naphthoate. We compare the results of this work with the published one of alkyltrimethylammonium 2-hydroxy-1-carboxy-naphthoate (CxTA 2,1 HCN, x = 16.14 or 12) [2]. With increasing counter-ion surfactant ratio r we observed transition from the isotropic L1-phase to multilamellar vesicles (MLV) La-phase. The single phases are separated by a two phase L1/L alpha region. The phases were characterized with FF-TEM, rheological and SANS measurements. For 100mM solution of either C8TAOH/2,1 HNC or C10TAOH/2,1 HNC, both MLV phases behave like a weak gel and have a yield stress value. It is thus shown that it is possible to prepare viscoelastic surfactant solutions with a small yield stress value from single chain surfactants with decyl or octylchain. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3217 [article]

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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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Synergism in mixed anionic–amphoteric surfactant solutions: influence of anionic surfactant chain length / R. Abdel-Rahem in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 5/2009 (09-10/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 5/2009 (09-10/2009) . - p. 298-305 Titre : Synergism in mixed anionic–amphoteric surfactant solutions: influence of anionic surfactant chain length Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur Année de publication : 2009 Article en page(s) : p. 298-305 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Surfactant  amphotérique  Concentration  critique  Micelle  Paramètres  interaction Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The influence of chain length on the composition of mixed micelles in binary mixtures of N,N-dimethyldodecylamine oxide (DDAO) and sodium decyl-, sodium dodecyl-and sodium tetradecylsulfate (abbreviated as SDeS, SDS ans STS, respectively) has been determined at 30°C. From the surface tension measurements, the critical micelle concentration (cmc) data were measured as a function of mixing composition. Cmc-values were then analyzed according to regular solution model. The composition of mixed micelles, the interaction parameter (B) and the activity coefficients were evaluated from the regular solution model for the all anionic-amphoteric mixed systems. The interaction parameter values indicated a synergistic interaction between DDAO and the three anionic surfactants at all mole fractions to be due to an overall attractive interaction in the mixed micelles. The strength of the interaction between tha amphoteric surfactant and the sodium alkyl sulfate in three mixed systems obeys the following order : SDeS/DDAO>SDS>DDAO>STS>DDAO suggesting that the decrease in the length of anionic surfactant alkyl chain results in a stronger interaction with DDAO. On the other hand, the viscosity data reveals a viscosity increasing trend of STS/DDAO>SDS/DDAO>SDeS/DDAO. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6251 [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)

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