稀释法求微乳液体系的结构参数

Calculating the Structural Parameters of Microemulsion Systems by Dilution Method

本文用简便、准确的稀稀法求得了ＳＤＳ（十二烷基硫酸钠）－醇－正庚烷－水组成的Ｗ／Ｏ型微乳液的结构参数：水内核半径Ｒ＿ｗ、颗粒有效半径Ｒ＿ｅ、界面层厚度１、平均聚集数、颗粒总数Ｎ＿ｄ以及分散相所占总界面积Ａ＿ｄ。还求出不同水量和不同醇（正戊醇～正辛醇）时，醇从连续相（ｃ）转移到界面层（ｉ）的自由能变化发现、颗粒半径Ｒ＿ｗ与醇的碳原子数ｎ具有线性关系。同时发现Ｒ＿ｗ与含水量Ｖ＿（Ｈ２０）近似呈线性关系。

The structural parameters of the SDS(sodium dodecyl sulfate)-alcohol-heptane-water system,i.e.,the radius of inner water droplet R_w,the effective radius ofparticle R_e,the length of interface l,the average aggregation number of surfactant n,the total number of particles N_d and the total interfacial area of dispersed phase A_d,were obtained by means of dilntion method and theoretical calcnlation. The change ofstandard free energy for alcohol to transfer from the continuous pkase to tbeinterfacial niembranes was also calculated.It was found that the linear relationshipsexist between or R_w and the carbon atom number of alcohol n,and between R_wand the water content V_(H20).