Control of rheological behaviour with oppositely charged polyelectrolyte surfactant mixtures / I. Hoffmann in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 6 (11-12/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 6 (11-12/2011) . - p. 488-494 Titre : Control of rheological behaviour with oppositely charged polyelectrolyte surfactant mixtures Type de document : texte imprimé Auteurs : I. Hoffmann, Auteur ; S. Prévost, Auteur ; M. Medebach, Auteur ; S. Rogers, Auteur ; N. J. Wagner, Auteur ; M. Gradzielski, Auteur Année de publication : 2011 Article en page(s) : p. 488-494 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffusion aux petits angles Polyélectrolytes Rhéologie Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Mixtures of the cationic, cellulose based polyelectrolyte JR 400 and the anionic surfactant sodium dodecylbenzene sulfonate (LAS) have been used to control the rheological behaviour of aqueous solutions. Around charge equilibrium precipitation takes place, but both for the surfactant-rich and the polymer-rich side homogeneous solutions are formed. In these monophasic regions the rheology depends strongly on the mixing ratio between the two components and highly viscous systems can be obtained on the polyelectrolyte rich side upon the addition of relatively small amounts of surfactant. Here the viscosity increases by more than four orders of magnitude before reaching the phase boundary of precipitation. Small-angle neutron scattering (SANS) showed the formation of an interconnected network of rodlike aggregates composed of a polyelectrolyte/surfactant complex, which explains the observed high viscosity due to the high degree of interconnection by the polyelectrolyte. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12618 [article]

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Thermo-responsive Metal-chelating Surfactants : Properties and Use in Cloud Point Extraction of Uranyl Nitrate / S. Prévost 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. 100-104 Titre : Thermo-responsive Metal-chelating Surfactants : Properties and Use in Cloud Point Extraction of Uranyl Nitrate Type de document : texte imprimé Auteurs : S. Prévost, Auteur ; H. Coulombeau, Auteur ; K. Baczko, Auteur ; L. Berthon, Auteur ; N. Zorz, Auteur ; H. Desvaux, Auteur ; F. Testard, Auteur ; Th. Zemb, Auteur ; C. Larpent, Auteur Année de publication : 2009 Article en page(s) : p. 100-104 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Thermo-responsive  surfactants  Metal  binding  Uranyl  complex  Cloud  point  extraction  Nonionic Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The properties of new thermo-responsive functional surfactants, capable of forming a metal chelate, synthesized by grafting a diamide group (amino-acid residue) to the tip hydrophilic endgroup or in a branched position to polyoxyethylene nonionic surfactants [CiEj: CiH2i+1(OCH2CH2)jOH)], are studied. Their use in cloud point extraction of uranyl nitrate is tested. The reversible temperature-dependent behavior of classical non-ionic surfactants associated to phase separation of micellar solutions known as clouding behavior is exploited for separation based on cation specific binding to the chelating group. The functional surfactants under investigation combine surface-active properties and characteristic thermoreversible behavior with a capacity to bind uranyl cation. The influence of the complexation on the cloud points of functional surfactants is determined. The chelating surfactants are found efficient for the cloud point extraction of uranyl nitrate at low surfactant-to-uranyl ratio. These new thermoresponsive surfactants with chelating properties hold most promise for the development of new solvent free extraction processes. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4578 [article]

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