Miscibility of 1-Hexanol and 2-(Octylsulfinyl)ethanol in the Adsorbed Film and Micelle

Structure Effect on Nonideal Mixing of Alkyl Methyl Sulfoxide and Alkyldimethylphosphine Oxide in Adsorbed Film and Micelle

“…It has been shown that the extent of the nonideality of mixing is best expressed by the excess functions (17,18). The excess Gibbs free energy g H,E and area a H,E of adsorption were calculated by substituting the f i H value and its dependence on ␥ in Fig.…”

“…The nonideal mixing in micelle is also examined quantitatively by the activity f i M of surfactant i in micelle evaluated by applying (17,18) …”

“…Deviation from the ideal mixing is estimated by the activity coefficient f i H of surfactant i in adsorbed film evaluated by applying the equation (17,18) …”

Structure Effect on Miscibility of Butanol and Dodecyltrimethylammonium Chloride in Adsorbed Film

“…We have shown that the surface tension at the critical micelle concentration depends on the bulk composition of alcohol and surfactant. It has been concluded from the thermodynamic analysis of the dependence that the compositions in micelle and adsorbed film at equilibrium and, therefore, the miscibility of surfactant and alcohol molecules, are different from each other in the micelle and in the adsorbed film (7)(8)(9), due most probably to the different geometrical structures.…”

Miscibility of Butanol and Cationic Surfactant in the Adsorbed Film and Micelle

“…The thermodynamic treatment, which we have developed on the miscibility of binary surfactants in the adsorbed film and micelle (17)(18)(19), has been proved to be correct and successful in the following aspects: (i) the theory is not based on any particular model, hence it is applicable to any type of binary system such as nonionic-nonionic, nonionic-ionic, and ionicionic surfactant mixtures (18,19); (ii) the interaction between the alcohol and surfactant molecules is quantitatively estimated by means of the activity coefficient or the excess Gibbs energy; and (iii) the excess entropy, enthalpy, and excess area are also obtained from the temperature and surface tension dependences of the excess Gibbs energy and they are highly useful to understand the molecular interaction and to offer a concrete image on the interaction (20 -22). In our recent paper (22), we showed the structure effect of butanol on its miscibility with dodecyltrimethylammonium chloride (DTAC) in the adsorbed film quantitatively by calculating the excess Gibbs energy and it is found that the net molecular interaction between linear n-butanol (NBA) and DTAC is stronger than that between branched t-butanol (TBA) and DTAC.…”