十二烷基硫酸钠/正丁醇/环已烷/水微乳液性质研究

目的]研究十二烷基硫酸钠/正丁醇/环己烷水微乳液的性质。方法]绘制十二烷基硫酸钠（SDS）/正丁醇/环已烷/水体系相图,测定不同温度时该体系中W/O型微乳液的电导率,并计算该体系的导电活化能,研究了活化能随温度的的变化规律。用稀释法求得该体系中W/O型微乳液的结构参数、醇从连续相转移到界面层的自由能变化。结果]活化能随含水量的变化与微乳液出现渗滤现象有关。体系的水内核半径随含水量增加而增大,自由能降低。结论]为农药微乳剂的开发研究提供理论依据。

Study on Properties of Sodium Dodecyl Sulfate/n-butanol/ cyclohexane/ water microemulsion

Objective] The aim was to study the properties of sodium dodecyl sulfate/n-butanol/cyclohexane/water microemulsion.Method]Phase diagrams of the sodium dodecyl sulfate(SDS)/n-butanol/cyclohexane/water system at 25 ℃ were mapped out.The conduction activation energies(Ea)of W/O microemulsion in system were estimated from electric conductivity data of microemulsion at different temperatures.Variations of activation energy with water content of microemulsion were determined.The structural parameters,change of standard free energy for hexanol to transfer from the continuous phase to the interfacial membranes for W/O type microemulsion were calculated by means of dilution method.Result]The results showed that variations of Ea with water content in W/O microemulsion were closely related to the occurrence of the percolation conduction phenomena.The water nucleus radius Rw increases and the free energy ΔGc-i reduces with the increase of water content.Conclusion] The study provided theoretical basis for development and study on microemulsion.