十六烷基三甲基溴化铵／正丁醇／正辛烷／水油包水型微乳体系的相行为

Phase behavior of W/O microemulsion system of CTAB/butanol/octane/water

文中分别考察了助表面活性剂(正丁醇)、有机溶剂(正辛烷)、温度、钨酸钠溶液浓度对十六烷基三甲基溴化铵(CTAB)/正丁醇/正辛烷/水油包水(W/O)型微乳区域形成的影响,并对该微乳体系的结构进行了电导研究,确定了微乳液体系形成区域及最佳比例配方。研究表明:助表面活性剂、有机溶剂、盐溶液质量浓度对该微乳液体系的微乳区域都会产生影响,温度对该微乳区域几乎没有影响;且当CTAB/正丁醇质量比为1∶2,(CTAB+正丁醇)/正辛烷质量比为4∶6时(滴加蒸馏水前),能够得到较大且稳定的微乳区域。该研究从热力学相图原理上为纳米粒子可控制备提供了理论依据。

The phase behavior of hexadecyl trimethyl ammonium bromide （CTAB）/butanol/ octane/H2O microemulsion system was studied according to the phase diagram theory of thermodynamics. The factors including cosurfactant （ n-butanol）, organic solvent （ n-octane）, temperature and mass concentration of salt solution （ sodium tungstate） were analyzed based on the experimental research, and the parametric variation range of these parameters influencing the W/O microemulsion＇s region was obtained. The structure of the microemulsion system was also studied by conductivity research, and the formative region and optimum proportion of the microemulsion system were determined. Experimental results show that cosurfactant, organic solvent and mass concentration of the salt solution are main factors influencing the microemulsion region formation, but temperature has no effect on the process. It indicates that the big and stable microemulsion region is formed when m（ CTAB）：m（n-butanol） = 1： 2, m（ CTAB ＋ n-butanol）： m （n-octane） =4：6.