Abstract
AbstractThe surface tension of the two mixed systems had been investigated in 0.1 M NaCl solution at 298.15 K respectively, including the surface tension of the anionic surfactant N-lauroyl-N-methyl taurine sodium (SDMT) and of the cationic surfactant dodecyltrimethylammonium chloride (DTAC), and zwitterionic surfactant dodecyl betaine (BS-12). The chemical surface properties of the two mixed systems were studied and the regular solution theory was applied to the two mixed systems. The results showed that the binary surfactant mixtures of SDMT/DTAC and SDMT/BS-12 exhibited synergism in surface tension reduction effectiveness, surface tension reduction efficiency and the mixed micelle formation according to β values. It was also found that the results calculated by this theory agreed well with the experimental values.
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