Synergistic interactions between zwitterionic surfactants derived from olive oil and an anionic surfactant

Abstract

The surface properties of the mixtures of zwitterionic surfactants derived from olive oil (carboxylbetaine-OCB and sulfobetaine-OSB) and anionic surfactant-sodium dodecylbenzene sulfonate (SDBS) at different mole fractions were investigated by surface tension measurement. The influences of the addition of inorganic salts (NaCl, MgCl₂) on the surface activities in OCB/SDBS and OSB/SDBS systems were also studied. The result shows that the two mixed systems possess lower CMC values and higher surface activities over all mole fractions studied than their individual components. Meanwhile, the noticeable synergistic interactions of OCB/SDBS and OSB/SDBS were determined by the micelle interaction parameter (β^m) according to regular solution theory. It is observed that the mixed OCB/SDBS system at α_OCB = 0.6 and the mixed OSB/SDBS system at α_OSB = 0.6 exhibit the strongest synergism. In addition, the binary surfactant mixtures performed better surface activities upon addition of inorganic salts and the different valence state of mental ions of the inorganic salts had different surface ability effect on the mixed system: Mg²⁺ > Na⁺.

Graphical Abstract

Keywords:

• Inorganic salt
• surface properties
• synergistic interaction
• zwitterionic surfactants

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

We gratefully acknowledge the financial support of the National Natural Science Foundation of China (21676003), Beijing Municipal Science and Technology Project (Z171100001317015), National key R&D Program of China (2017YFB0308701), the Science and Technology Program Key Project of Beijing Municipal Commission of Education (KZ201510011010), the transformation of scientific and technological achievements-promotion plan project (PXM2016_014213 _000028).