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采用加溶法研究了由阴离子型表面活性剂直链烷基磺酸钠 Cn H2 n+1SO3Na( n=8,10 ,12 ,14) -正烷烃 -正已醇 -水组成的四组分微乳液 ,探论了微乳液体系不同含水量时烷烃链长、表面活性剂链长和盐浓度对正已醇从油相转移至界面相对自由能 -△ Goo→ i变化的影响 ,发现自由能 -△ Goo→ i与烷烃链长有线性关系 ,但含水量不同 ,烷烃链长对自由能 -△ Goo→ i的影响不同 ,含水量越高 ,烷烃链长影响越大 ;在盐浓度为 O- 0 .12 mol/ L范围时自由能 -△ Goo→ i与盐浓度有线性关系 ,但不同含水量时盐对自由能 -△ Goo→ i的影响不同 ,含水量越低 ,盐浓度的影响越大 ;烷烃为正辛烷时 ,自由能 -△ Goo→ i与表面活性剂的链长有线性关系 ,但不同含水量时表面活性剂的链长对自由能 -△ Goo→ i的影响不同 ,含水量越低 ,表面活性剂的链长的影响越大 .这方面的研究对我们认识微乳液的结构和稳定性十分重要 .
A four-component microemulsion composed of anionic surfactant sodium alkylsulfonate Cn H2 n + 1SO3Na (n = 8,10,12,14) -n-alkane-n-hexanol-water The effects of alkane chain length, surfactant chain length and salt concentration on the relative free energy - △ Goo → i transition of n-hexanol from the oil phase to the interface were investigated under different water contents. It was found that the free energy- △ Goo → i has a linear relationship with the alkane chain length, but the water content is different. The influence of the alkane chain length on the free energy - △ Goo → i is different. The higher the water content, the greater the alkane chain length. In the range of 0.12 mol / L, the free energy - △ Goo → i has a linear relationship with the salt concentration, but the effect of salt on free energy - △ Goo → i is different under different water contents. The lower the water content, the more the effect of salt concentration When the alkane is n-octane, the free energy - △ Goo → i has a linear relationship with the chain length of the surfactant, but the influence of the chain length of the surfactant on the free energy - △ Goo → i is different at different water contents, The lower the water content, the greater the influence of the chain length of the surfactant. This aspect of our understanding of microemulsion knot Structure and stability is very important.