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用稀释法和电导测定法求得了阴离子表面活性剂 (SDS) -正己醇 -烷烃 -水或水溶液组成的w/o型微乳的结构参数 ,醇从连续相转移到界面层的自由能变化△G0c→i和活化能△E ,研究了烷烃碳原子数、温度及电解质浓度的影响 .结果表明 :△G0c→i与烷烃碳原子数n及ln△E与烷烃碳原子数n有如下线性关系 △G0c→i=- 5 .85 73+0 .36 87n ln△E =12 .34 6 1- 0 .2 784n在 30～ 45℃温度范围 ,结构参数与温度及△G0c→i与温度也有很好的线性关系 ,水核半径Rw 及颗粒有效半径Re 等随温度升高而变大 ,△G0 c→i降低 ,微乳液稳定性降低 ;当NaCl溶液浓度为 0 .0 10mol·L-1时 ,体系的自由能ΔG0c→i降低较大、活化能△E最大 ,且所形成的水核半径Rw 及颗粒半径Re 也是最小的 ,微乳液体系最稳定 .
The structure parameters of w / o microemulsion composed of anionic surfactant (SDS) -hexanol-alkane-water or aqueous solution were obtained by the dilution method and the conductivity measurement. The free energy change of the alcohol transferred from the continuous phase to the interface layer was △ G0c → i and activation energy △ E.The results show that △ G0c → i has the following linear relationship with the number of carbon atoms n and ln △ E of alkane and the carbon number n of alkane △ G0c → i = - 5 .85 73 +0 .36 87n ln △ E = 12.334 6 1- 0 .2 784n In the temperature range of 30 ~ 45 ℃, the structure parameters and temperature and △ G0c → i and temperature are also very Good linear relationship, water core radius Rw and particle radius Re and so on with increasing temperature become larger, △ G0 c → i decreased, decreased the stability of the microemulsion; when the NaCl solution concentration of 0 .0 10mol · L-1 , The free energy of the system ΔG0c → i decreased significantly, the activation energy △ E maximum, and the radius of the formed water core Rw and the particle radius Re was also the smallest, the microemulsion system was the most stable.