The Elasticity of Adsorption Layers of Reorientable Surfactants

The adsorption properties of short chain alcohols and Triton X-100 mixtures at the water–air interface

“…However, the Fainerman and Miller [16][17][18] equation of state allows us to predict these changes on the basis of the data for individual components of the mixtures if their molar area is known and the behaviour of the solutions is close to that of ideal one. In the case of the nonideal solution the changes of the surface tension as a function of the concentration can be only described introducing the correcting parameter for the calculation values of x [25,29].…”

“…[ [16][17][18] suggestions, we calculated the x values in a somewhat different way than in the earlier studies [25,29], namely, we assumed that the minimal values of the molar surface area of TX-100 and alcohol are not constant for all aqueous solutions of their mixtures and they depend on the mixture composition. On the other hand, it means that at the concentration of TX-100 close or higher than that corresponding to the saturated monolayer, it is impossible that x 1 ¼ 2:15 Â 10 5 , and x 2 ¼ 1:26 Â Table 1.…”

“…Recently, Fainerman and Miller [16][17][18], taking into account the ideal mixture of homologue surfactants, proposed the equation of state which can be written:…”

“…However, for TX-100 and alcohol mixtures the x 1 -x 2 -x and the values of the mean molar surface area of the mixtures can be calculated on the basis of x 1 and x 2 from the following expression [16][17][18]:…”

“…Therefore, in this paper the influence of short chain alcohols and Triton X-100 mixtures on the water surface tension and the possibility to establish the relationships between the surface tension of the aqueous solutions of these mixtures and their composition was investigated. For investigation of these relationships the Szyszkowski, Connors [9,14,15] and Fainerman and Miller [16][17][18] equations were used and interpreted on the basis of the behaviour of the alcohol and TX-100 molecules in the adsorbed mixed surface layer and in the solution bulk phase. Thus, the ''real" composition of the mixed surface layer on the basis of Guggenheim-Adam isotherm [19] of the adsorption and thickness of this layer was deduced.…”