Mixing of a non-ionic surfactant Tween 80 and an anionic surfactant sodium dodecyl benzene sulfonate
(DBSNa) has been studied to observe their synergism. Induced by its application in IFT reduction with
crude oil for a potential enhanced oil recovery, its characterisation has been done to understand the
insight of micellization. The CMC for blend of Tween 80 and DBSNa was found to be 0.020 ± 0.0059 mM.
Interfacially adsorbed excess concentration Gexcess and surface tension s reduction has been studied from
the tensiometry analysis. Conductivity study has shown relevance to the CMC obtained from tensiometry
and provides the binding parameters. Thermodynamic interpretation has been done to quantify the
experimental observations through the analysis of regular solution theory. Thermodynamic coefficients
and constants have quantified the physical phenomena and DH, DS, DG featured spontaneity of micellization.
Cyclic voltammetry study contributes the concepts of electrochemistry and redox potential for
mixture. Physical delineation of the micelle has been done by DLS interpretation. Thermodynamic state
functions, viz. free energy of micellization (DGmicelle) and adsorption (DGads) have been calculated to find
out the packing parameter P, which indicates a probable spherical or globular micelle of the mixed
surfactant.