Abstract
Abstract Cyclic voltammetry, fluorescence and viscosity measurements were carried out to study the effect of various glycol additives such as EG, DEG, TEG, EGMME and EGMEE on the micellar properties of zwitterionic surfactants, DPS, TPS and HPS. Cyclic voltammetry has been used to determine the diffusion coefficient ‘D’ values by the use of well known Randles-Sevcik equation. The decrease in the ‘D’ values on addition of glycol additives has been explained on the basis of hydration effect and obstruction effect which is more in case of TEG and EGMEE. The destabilization of micelles of zwitterionic surfactants with the addition of glycol additives is explained on the basis of decrease in transfer of free energy (∆Gºt). In case of TEG the change in intensity ratios (∆ I1/I3) determined by fluorescence measurements become more negative with its increasing concentration which indicates that the zwitterionic surfactants are becoming more hydrophobic in its presence. The determination of relative viscosity (ηr) for each system indicates the surfactant-glycol oligomer interaction in the micellar state.
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