Electrochemical study of micellization of Ester-Containing Gemini Surfactants in Water-Ethylene glycol system

Cyclic voltammetry has been used efficiently to investigate the phase transition observed at the studied concentration range. CV measurements were done to determine the diffusion coefficientsof aggregates and the interparticle interaction parameters. The mean diameters of aggregates obtained by CV can be obtained by alternative methods such as DLS and TEM as well. The mean diameter of gemini surfactant aggregates obtained from DLS indicated that large aggregateschanged to small micelles as indicated by CV measurement as a dramatic decrease in self diffusion coefficient. The interparticle interactions were assessed in terms of Water-Ethylene glycol as solvent effects on the micellar surface charge density, the morphology changes, and thephase transition[1] . Since the EG additive affects both micellar properties and dielectric constant,the overall effect is obtained from the resultant effect of these effects. As indicated by CV study, the dielectric constant is negligible while the effect of EG on micellar properties is significant since it results in a phase transition, from giant vesicular particles to partly smaller aggregates, and increase the diffusion coefficient consequently[1, 2].

Keywords:

cyclic voltammetry , diffusion coefficient , interparticle interaction parameter , Gemini surfactants , aggregates