Effect of hydrocarbon structure of the headgroup on the thermodynamic properties of micellization of cationic gemini surfactants: An electrical conductivity study

► The headgroup alkyl chain affects the thermodynamic properties of gemini surfactants. ► The temperature of the minimum of cmc (Tmin) increases with increasing the headgroup alkyl chain length. ► Log (cmc) does not vary linearly with carbon number of the headgroup alkyl chain. ► The enthalpy-entropy compensation plots exhibit excellent linearity.