On the ideality of liquid mixtures of long-chain n-alkanes

Phase diagram ofn-hexacosane andn-octacosane: experimental determination and calculation

“…Moreover, measurements of the heat of mixing, carried out in our laboratory, have shown an athermal behaviour. (59) It can be seen in figure 4 that the calculated phase equilibrium represents well the experimental data.…”

“…The liquid and the α-RII phase are assumed to form an ideal mixture. (59) So, the excess molar Gibbs energy is equal to zero according to the experimental results of Ghogomu et al (59) Some authors (20,67,68,75) consider the mixtures of n-alkanes in the liquid phase, or in the α-RII phase to be not ideal, but in this work the chain length difference between C 26 and C 28 is low and, therefore, the value of the excess molar Gibbs energy can be neglected. Moreover, measurements of the heat of mixing, carried out in our laboratory, have shown an athermal behaviour.…”

Are the mixtures of homologous surfactants ideal?

“…It is commonly accepted that β M,core is typically equal to zero for mixtures of two hydrocarbon based (or fluorocarbon based) surfactants [31,32], but is larger than zero for a binary mixture of hydrocarbon and fluorocarbon surfactants due to the repulsive interactions in the micellar core [31][32][33][34][35][36].…”

Effect of Double Bonds in the Formation of Sodium Dodecanoate and Sodium 10-Undecenoate Mixed Micelles in Water

“…It is commonly accepted that M,core is typically equal to zero for mixtures of two hydrocarbon-based (or fluorocarbon-based) surfactants 29,30 but is larger than zero for a binary mixture of hydrocarbon and fluorocarbon surfactants due to the repulsive interactions in the micellar core. 29-34 M is related to the excess chemical potential of mixing: in which R is the gas contant.…”