G12NCl2水溶液与正癸烷体系界面张力研究

摘要

用旋转滴法测定了N，N’-二烷基-N，N，N’，N’-四甲基二胺二氯化物（G12NCl2）水溶液与正癸烷之间的动态界面张力（DIFT），考察了表面活性荆G12NCl2的浓度对水一正癸烷体系动态界面张力的影响．结果表明：当G12NCl2浓度低于cmc时，浓度越大，DIFT曲线越低，界面张力随时间的变化趋势越缓，达到平衡的时间越短．当浓度达到或者高于cmc时，DIFT曲线几乎水平．根据DIFT曲线，得到了不同温度下水-正癸烷体系中G12NCl2的cmc，该数据显著低于在水一空气体系中的cmc．%The dynamic interracial tension （DIFT） of N,N＇-didodecyl-2-hydroxyl-N,N,N＇ ,N＇-tet- ramethyl dichloride （G12 NCl2） and n-decane system was measured by spinning drop method and the effect of surfactant concentration on the dynamic interfacial tension was investigated. The results show that, when the surfactant concentration is lower than cmc, the higher the concentration of surfactant is, the lower will be the curve of the DIFT,the slower will be the changing trend of DIFT, and the shorter will be the equilibrium time. When the surfactant concentration is above the crnc,the value of DIFT does not change basically with the time. Through the curves of DIFT,the cmc of G12NCl2 in water-decane sys- tem in different temperature is obtained and the cmc is much lower than that in water-air system.