Abstract
The micellization and interfacial properties of three homologous dicationic ester-bonded cleavable and biodegradable gemini surfactants, ethane-1,2-diyl bis(N,N-dimethyl-N-alkylammoniumacetoxy) dichlorides, referred as m-E2-m (m=12, 14, 16), and their binary mixtures were investigated in aqueous solution by performing conductivity and surface tension measurements. The decrease in critical micelle concentration (CMC) indicates nonideality of the mixed systems of different compositions. The unequal hydrophobic chain length might be playing a significant role in the reduction of CMC values. Several theoretical treatments were used to analyze and compare the mutual interaction parameters, counter ion binding, surface parameters, excess free energy of micellization and standard free energies for the mixed surfactant systems as well. The negative values of interaction parameters show an overall attractive force, i.e., synergistic effect in the mixed state. The excess free energy of mixing has negative values for all the systems.
Published Version
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