Hasti Aghdastinat - Department of Physical Chemistry, Tarbiat Modares University, Tehran
Soheila Javadian - Department of Physical Chemistry, Tarbiat Modares University, Tehran
Hossein Gharibi - Department of Physical Chemistry, Tarbiat Modares University, Tehran
Alireza Hehrani Bagha - Department of Physical Chemistry, Tarbiat Modares University, Tehran

In this article the Physicochemical, properties of dedecyl betainate gemini (s=3) which is new synthesized cleavable surfactant were investigated through surface tension and electrical conductivity techniques in absence and persent of NaBr salt. The critical micelle concentration (CMC), surface excess concentration (Γ(max)) mean molecular surface area (A(min)), degree of counterion dissociation (a) and the thermodynamic parameters of micellization were determined from the surface tension and conductance data. It was observed that CMC, ⊿G˚(mic) and A(min) decrease as the amount of electrolyte in the aqueous medium was increased.

Cleavable gemini surfactant< surface tesion, Conductometry, Aggregation