Interaction between anionic and zwitterionic surfactants: Sodium dodecyl sulfate and N-alkyl-N, N-dimethylsulfobetain, N-lauroylsarcosine

摘要

The interaction between anionic and zwitterionic surfactant has been investigated through the measurements of surface tension and pH. These systems are sodium dodecyl sulfate (SDS) and N-alkyl-N,N-dimethylsulfobetain(SB) N-lauroylsarcosine(NL). As the molar ratio of SDS to SB is 7:3, the cmc of these systems exhibits minimum and the surface activity is in-depend on pH. As the molar ratio of NL to SDS is from 3:7 to 7:3, the synergistic effect of the systems exhibits significantly, the surface tension increases with decreasing of pH and deposits has formed.