双子表面活性剂溶液的表面活性的研究

The Surface Tension Study of the Gemini Surfactant Solutions

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(己)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,测定了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基溴化铵(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SDBS复配,其协同效应不如DTAB.动态表面张力测定得到它们的各种参数:ti,tm,γm,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.

Gemini surfactant systems are investigated by the surface tension measurement. The results reveal that the gemini surfactants have higher surface activity than the conventional surfactants. The surface activity of gemini surfactants strongly depends on the structure of their spacer groups. The synergism is not marked and is not as good as DTAB when the cationic gemini surfactant is mixed with the conventional anionic surfactant. The equilibrium surface tension (gamma (e)) of a surfactant solution is not achieved instantaneously. The DST (dynamic surface tension) curves for the above systems were measured and some parameters obtained: t(i), t(m), gamma (m), t(*) n. The results indicate that the instantaneous surface activities of the gemini surfactants are higher than those of DTAB.