Gemini surfactant system are investigated by the durface tension measurement. The results reveal that the gemini surfactants have higher surface activity than the conventional surfactants. The surface activity of gemini durfactants strongly depends ion the structure of their spacer goups. The synergism is not marked and is not as good as dtab DTAB whem the cationic gemini surfactant is mixed with the conventional anionic surfactant. The aquilibrium surface tension (γ~e) of a surfactant solution is not achieved instanbtaneously. The DST (dynamic surface tansion ) curves for the above systems were measured and some parameters obtained. t~i ,t~m,γ ~m , t*,n. The results indicate that the instantaneous surface activities of the gemini surfactants are higher than those of DTAB.

Key words: SURFACTANTS, SURFACE ACTIVITY, MICELLE, SODIUM DODECYL BENZENE SULFONATE, SURFACE TENSION