十二烷基磺酸钠微乳状液的相行为及其结构转变

Phase Behavior and Structural Transitions in Sodium Dodecyl Sulfonate Microemulsions

制备了Ｃ１２Ｈ２５ＳＯ３Ｎａ／ｎＣ４Ｈ９ＯＨ／ｎＣ７Ｈ１６／Ｈ２Ｏ和Ｎａ２ＳＯ４／Ｈ２Ｏ／Ｃ１２Ｈ２５ＳＯ３Ｎａ／ｎＣ４Ｈ９ＯＨ／ｎＣ７Ｈ１６体系在ｋｍ＝ＷＣ４Ｈ９ＯＨ／ＷＣ１２Ｈ２５ＳＯ３Ｎａ＝２时的相图．测定了起始含油质量分数为２１的上述表面活性剂辅助表面活性剂正庚烷体系在纯水和在不同浓度Ｎａ２ＳＯ４水溶液中单相微乳状液的电导率随含水量的变化曲线．由电导率曲线研究了微乳状液由Ｗ／Ｏ→二连续→Ｏ／Ｗ型的结构转变．

Phase diagrams of C 12 H 25 SO 3Na/n C 4H 9OH/n C 7H 16 /H 2O system and Na 2SO 4/H 2O/C 12 H 25 SO 3Na/n C 4H 9OH/n C 7H 16 system with various salinities at k m=W C 4H 9OH /W C 12 H 25 SO 3Na =2 are presented.The variations of the conductivities of different microemulsion samples with the water or brine content at initial oil content 21%(wt%) were made.From conductivity measurements we investigated a change in structure from water droplets in oil (W/O) at low water (or brine) content to a bicontinuous structure at intermediate water(or brine) content and a structure of oil droplets in water (O/W) at high water (or brine) content in the one phase microemulsion.