Research of Binary Surfactant Mixtures Based on N-Lauroyl Sarcosinate

Abstract Surface properties of binary surfactant systems of N-lauroyl sarcosinate (LS) with fatty alcohol polyoxyethylene ether (AEO 9 ), dodecyl trimethyl ammonium chloride (DTAC) and dodecyl dimethyl betaine (BS-12) have been investigated in aqueous NaCl (0.1 mol · L −1 ) solution at (298 ± 0.1) K, respectively. Synergistic parameters of the two components in both mixed micelles and mixed adsorption layers were obtained by calculations. Furthermore, we applied the regular solution theory on the mixed systems when synergism in mixed micelle formation, surface tension reduction efficiency and surface tension effectiveness was researched. The results show that there are synergistic effects in the mixed systems, the surface performances of the mixtures are significantly better than that of any single component in the mixed systems. The result coincides with the relevant theories of the ability of mixed micelle formation, surface tension reduction efficiency and surface tension reduction effectiveness.