Clouding of Binary Mixtures of Surfactants (Triton X-100/Tween-80 and Tween-20/Brij-35) and Binary Surfactant and Polymer Combinations (Brij-56/Poly-Vinyl Alcohol (PVA) and Brij-56/Methyl Cellulose (MC))

The clouding of binary mixtures of Triton X-100/Tween-80 and Tween-20/Brij-35 has been investigated at different compositions. The effects of ionic surfactants, SDS and CTAB on the clouding of the above binary mixtures have been also studied. The clouding of the polymers PVA and MC has been as well examined in presence of the surfactant Brij-56. The phenomenon of clouding (which is essentially a phase separation of the species in solution at a paticular temperature) has been examined in terms of solubilization process to estimate-the associated enthalpy (ΔH⁰_Cl), free energy(ΔG⁰_Cl) and entropy (ΔS⁰_Cl) values by procesing the mole fractional solubility in the light of van't Hoff type equation. The solubilisation and the energetic parameters have been attempted to rationalize and explain on physical-chemical basis.