caa a22 4500 475763440 CHVBK 20180406123558.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/s003960050004 doi (NATIONALLICENCE)springer-10.1007/s003960050004 Interfacial and micellar properties of some anionic/cationic binary surfactant systems. 1. Surface properties and prediction of surface tension [Elektronische Daten] [Z. -G. Cui, J. P. Canselier] The surface tension equations of binary surfactant mixtures are established by combining the Szyszkowski equation for pure surfactant solutions and extended nonideal theory for mixed adsorption. They are then successfully applied to two relatively long-chain anionic/cationic binary surfactant systems: triethanolammonium dodecylpoly(oxyethylene)sulfate, as an anionic species (containing about 2 ethylene oxide units), mixed with dodecyltrimethylammonium bromide or hexadecyltrimethylammonium bromide. The composition of the mixed monolayer is mixing-ratio dependent and is slightly asymmetric: for overall equimolar mixtures, the larger mole fraction in the mixed monolayer is that of the more surface-active ion. The strong synergetic effects observed in the surface tension reduction efficiency are reflected by large negative βs parameters, according to regular solution theory. They can be interpreted by the more negative adsorption free energy of each surfactant and the smaller area occupied by surfactant hydrocarbon chains in the mixed monolayer. Springer-Verlag Berlin Heidelberg, 2000 Key words Surface tension nationallicence Anionic/cationic surfactants nationallicence Mixed monolayer composition nationallicence βs interaction parameter nationallicence Gas-liquid adsorption free energy nationallicence Cui Z. -G Laboratoire de Génie Chimique (UMR CNRS 5503, INPT-ENSIGC/UPS), Ecole Nationale Supérieure d'Ingénieurs de Génie Chimique, 18 Chemin de la Loge, F-31078 Toulouse Cedex 4, France, FR aut Canselier J. P. Laboratoire de Génie Chimique (UMR CNRS 5503, INPT-ENSIGC/UPS), Ecole Nationale Supérieure d'Ingénieurs de Génie Chimique, 18 Chemin de la Loge, F-31078 Toulouse Cedex 4, France, FR aut https://doi.org/10.1007/s003960050004 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050004 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cui Z. -G Laboratoire de Génie Chimique (UMR CNRS 5503, INPT-ENSIGC/UPS), Ecole Nationale Supérieure d'Ingénieurs de Génie Chimique, 18 Chemin de la Loge, F-31078 Toulouse Cedex 4, France, FR aut NATIONALLICENCE 700 1- Canselier J. P. Laboratoire de Génie Chimique (UMR CNRS 5503, INPT-ENSIGC/UPS), Ecole Nationale Supérieure d'Ingénieurs de Génie Chimique, 18 Chemin de la Loge, F-31078 Toulouse Cedex 4, France, FR aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer