修正颗粒模型求微乳液体系的结构参数

Determination of Structural Parameters of Microemulsion by Modified Particle Model

提出了一种修正颗粒模型,并以该模型为基础用稀释法求得了水/span-80+异戊醇/环己烷W/O型微乳液体系的结构参数,包括水内核半径Rw、颗粒有效半径Re、界面层厚度le、表面活性剂平均聚集数ns、颗粒总数Ne等;并求出了异戊醇从连续相(C)转移到界面层(i)的自由能变化ΔGc0→i.计算结果表明,微乳液颗粒有效半径随着水与有效表面活性剂的物质的量的比w的增加而线性增加.

A modified particle model was proposed and used to calculate the structural parameters of the W/O microemulsion of H2O/span-80 ＋ isopentyl alcohol/cyclohexane by dilution method. These parameters include radius of water nucleus （R,）, effective radius （R,）, thickness of boundary layer （ le ）, aggregation number of surfactant （n,）, and total number of particles （N,）. Free energy change （△Gc→i^0） resulting from the transfer of isopentyl alcohol from the continuous phase （ C ） to the boundary layer （i） has been determined. Calculation results show that the effect radii of the microemulsion droplet increase linearly with the increasing of the mole ratio （w） of water to effective surfactants.