Szekeres Erika, Acosta Edgar, Sabatini David A, Harwell Jeffrey H
University of Oklahoma, School of Chemical Engineering and Materials Science, Sarkeys Energy Center, 100 East Boyd, Room T-334, Norman, Oklahoma 73019, USA.
Langmuir. 2004 Aug 3;20(16):6560-9. doi: 10.1021/la036482k.
When surfactants are used to solubilize oil, the oil to be solubilized is often a mixture of components with differing properties, for example, solubilization of drug molecules in microemulsion formulations, remediation of organic polluted aquifers using surfactants, and so forth. Previous research has demonstrated that selective solubilization of one organic component over the other may occur if the organic components are dissimilar. In this research, we investigated selective solubilization from benzene-limonene mixtures in Winsor type I and III microemulsion systems containing water, sodium di-n-hexyl sulfosuccinate, and NaCl. The effect of the oil phase composition and the electrolyte concentration on the selectivity was studied. It was found that the selectivity toward benzene was highest at low electrolyte and benzene concentrations, decreasing as the electrolyte or benzene concentration increased. The results are discussed on the basis of the two-state solubilization theory and by correlating the curvature of the surfactant film in the microemulsion with changes of the electrolyte concentration and the oil phase composition. A simple mathematical model is developed for the selectivity, which combines the two-state solubilization theory and the net-average curvature model of microemulsion solubilization to yield close agreement with the experimental data.
当使用表面活性剂增溶油时，待增溶的油通常是具有不同性质的组分的混合物，例如，药物分子在微乳液制剂中的增溶、使用表面活性剂修复受有机污染的含水层等等。先前的研究表明，如果有机组分不同，可能会发生一种有机组分相对于另一种有机组分的选择性增溶。在本研究中，我们研究了在含有水、二正己基磺基琥珀酸钠和氯化钠的Winsor I型和III型微乳液体系中，从苯-柠檬烯混合物中的选择性增溶。研究了油相组成和电解质浓度对选择性的影响。发现对苯的选择性在低电解质和苯浓度下最高，随着电解质或苯浓度的增加而降低。基于双态增溶理论并通过将微乳液中表面活性剂膜的曲率与电解质浓度和油相组成的变化相关联来讨论结果。为选择性建立了一个简单的数学模型，该模型结合了双态增溶理论和微乳液增溶的净平均曲率模型，以与实验数据产生紧密的一致性。
Zotero 插件