Nonideal Mixing in Adsorbed Film and Micelle of Ionic–Nonionic Surfactant Mixtures

✍ Scribed by Masumi Villeneuve; Hirotomo Sakamoto; Hisanobu Minamizawa; Norihiro Ikeda; Kinsi Motomura; Makoto Aratono

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 202 KB
• Volume: 194
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5081

✦ Synopsis

In our studies on the mixed adsorbed films and the mixed The surface tension of aqueous solutions of dodecylammonium micelles, the new concentration variables, which take acchloride-octyl methyl sulfoxide (OMS) and dodecyltrimethylamcount of the dissociation of ionic surfactants, and the phase monium bromide-OMS mixtures was measured as a function of diagrams of adsorption and micelle formation have been the total molality of surfactants and the composition of OMS. The introduced (8). Furthermore, we have proposed a criterion results were analyzed according to our thermodynamic procedure;

of the ideal mixing in the adsorbed film and the micelle ( 9) the phase diagrams of adsorption and micelle formation and the and defined activity coefficients of surfactants in the addiagram illustrating the composition relation between the micelle sorbed film for nonionic-nonionic surfactant mixtures (10).

and the adsorbed film at the critical micelle concentration were

The present paper extends our thermodynamic treatment drawn. The activity coefficient and excess Gibbs energy in the adsorbed film and the micelle were defined and then evaluated of the adsorbed film and the micelle to ionic-nonionic surfrom the phase diagrams. They were found to give useful informafactant mixtures, where the dissociation of ionic surfactant tion on the deviation from ideal mixing and intermolecular interacis explicitly taken into consideration. To this end, the total tion in the adsorbed film and micelle.