十二烷基磺酸钠微乳状液结构转变的电化学研究

制备了C12H25SO3Na-C4H9OH-C7H16-H2O四组分体系在km=W(C4H9OH)/W(C12H25SO3Na)=2时的拟三元相图。使用二茂铁和铁氰化钾作为电化学探针用循环伏安法测定了起始含油量为21％的无水混合物在滴加水过程中所形成的微太液的扩散系数。从扩散系数随含水量的变化确定微乳液的结构转变。含水量为20％－45％时生成油包水型微液;含水量大于65％时生成水包油型微乳液。当含水量在45％－65％之间时形成的是二连续型微乳液。电导率数据证实了循环伏安法的测定结果。

ELECTROCHEMICAL STUDY ON STRUCTURAL CONVERSION OF SODIUM DODECYL SULFONATE MICROEMULSION

A phase diagram of the pseudoternary sodium dodecyl sulfonate butanol heptane water (C 12 H 25 SO 3Na C 4H 9OH C 7H 16 H 2O) system at k m=W(C 4H 9OH)/W(C 12 H 25 SO 3Na)=2 was obtained.The diffusion coefficients of microemulsion with initial oil content 21%(wet%) were measured by using ferrocene (Fc) and potassium ferricyanide K 3Fe(CN) 6] as the electroactive probes by cyclic voltammetric measurement.The structural conversion of microemulsion has been determined from water content dependence of the diffusion coefficient in one phase microemulsion region.A water in oil microemulsion (W/O) was formed when the sater content is lower (20% to 45%).At high water content (>65%),and oil in water microemulsion (O/W) is stable.When the water content is within about 45% to 65% range,however,a bicontinuous structure of microemulsion was found.The electrical conductivity datum supported the results of cyclic voltammetric measurements.