Micellar and Surface Properties of Cationic-Cationic Binary Surfactant Mixtures: Synergistic Interactions and Solubility Enhancement of Anthracene

The micellar and surface behaviors of decylammonium chloride (DACl) in presence of L-alanine hydrochloride decylester (L-ADE) and L-alanine hydrochloride dodecylester (L-ADDE) at various mole fractions were investigated by conductivity and surface tension measurements. From the conductivity measurements, the critical micelle concentration (CMC), the degree of counter-ion ionization (α) and standard Gibbs energy of micellization (ΔG°mic) were investigated for both pure and binary mixtures. The molecular interaction parameter (β) and the micellar mole fraction (XmDACl) for mixed micelle formation by DACl/L-ADE (C10-C10) and DACl/L-ADDE (C10-C12) were calculated using the regular solution equation proposed by Rubingh. The ideal values of CMC (CMCideal) and the micellar mole fraction (XmDACl(ideal)) were also obtained for mixed micelle according to the pseudo phase theoretical models. The negative β values showed that there were synergistic interactions for all compositions of DACl/L-ADE and DACl/L-ADDE mixed systems. From the surface tension measurements, adsorption parameters such as the surface excess concentration (Γmax), minimum surface tension at the CMC, efficiency in the surface tension reduction (pC20), standard Gibbs energy of adsorption (ΔG°ads), and minimum area per head group of a molecule (Amin) in pure, mixed and their ideal values were also determined. The results indicated that the synergism and attractive interactions in the studied binary mixtures depend on the chain length of the cationic L-alanine ester and their mole fractions in the mixed system. The solubilization capacity of pure DACl and its mixed system with L-ADE and L-ADDE towards anthracene were determined and discussed in terms of molar solubilization ratio (MSR). Based on the MSR values, the solubility enhancement was found for anthracene in DACl/L-ADE and DACl/L-ADDE mixed systems.

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