双子表面活性剂溶液的表面活性的研究

研究了阳离子型双子表面活性剂，二溴化-N,N'-二(二甲基烷基)乙(已)二铵，以及它们与阴离子表面活性剂十二烷基苯磺酸钠(SDBS)复配体系的表面活性，测定上述体系的平衡态表面张力。结果表明：双子表面活性剂的表面活性大大高于十二烷基三甲溴化铵(DTAB)；对于两种双子表面活性剂，其表面活性和表面张力时间效应受其联接基团的影响远大于其烷基链的影响。双子表面活性剂与SDAB复配，其协同效应不如DTAB。动表面张力测定得到它们的各种参：t~i,t~m,γ~m,t*和n等值，结果表面双子表面活性剂的瞬时活性也高于DTAB。

The syrface tension study of the gemini surfactant solutions

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.