十二烷基硫酸钠多相微乳液的研究

Studies of Middle Phase Microemulsion Formed by Sodium Dodecylsulfate

十二烷基硫酸钠（ＳＤＳ）／正丁醇－异丙醇／庚烷／盐水体系可形成多相微乳液，研究了盐浓度，温度对相态的影响，并用小角Ｘ衍射，ＮＭＲ和ＥＳＲ技术对多相微乳液的结构进行了研究，比较了四相微乳液中两个富表活剂相的区别。结果认为该体系在合适条件下可形成三相及四相微乳液，微乳液中伴随有层状液晶存在。

Sodium dodecylsulfate/butanol - isopropanol/heptane/brine can form middle phase microemulsion. The effects of salinity and temperature on phase state of the microemulsion have been investigated. Microstructure of the microemulsion was determined by small angle X - diffraction, ESR and NMR. The difference of microstructure between the two surfactant - rich phases in four - phase microemulsion is compared. It can be concluded that three - phase and four - phase microemulsion can be formed under suitable conditions. Lamella liquid crystal appeared in both three- phase and four -phase microemulsion. The constituents and structure of two surfactant - rich phases in four - phase microemulsion are different. It is shown that microenvironment in the two surfactant - rich phases is different as detected by ESR, the constituents and average molecular ordering of water are also different as measured by 2H NMR.