Symmetry (Asymmetry) of the Molar Excess Gibbs Free Energy Function of the Binary Mixed Micelles of Bile Acid Anion and Classical Cationic Surfactant: Influence of Sterically Shielded and Sterically Unshielded Polar Groups of the Steroid Skeleton

Binary mixtures of surfactants build a binary mixed micelle in which the ratio usually differs from initial their mixture. The thermodynamic stabilization micellar pseudophase about hypothetical ideal state (intermolecular interactions between different particles and conformational states are identical to those monocomponent states) is described by molar excess Gibbs free energy (gE). dependence gE on fraction surfactant i (xi) can be symmetric function (symmetry line parallel y-axis passes through xi = 0.5) or an asymmetric function. Theoretical analysis (canonical partition function, analysis) examines how presence polar functional groups, some sterically shielded steroid skeleton bile salts (surfactant), affect symmetry cholic acid anion (bile salts) classic cationic (hydrophobic tail head). Suppose salt contains non-sterically groups (or temperature relatively high). In that case, At same time, if also then asymmetric.