Attractive interactions between reverse aggregates and phase separation in concentrated malonamide extractant solutions
Attractive interactions between reverse aggregates and phase separation in concentrated malonamide extractant solutions
复制标题
浓缩丙二酰胺萃取剂溶液中反向聚集体与相分离之间的相互作用
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
C. Madic
中科院分区：
文献类型：
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作者：
C. Erlinger;L. Belloni;T. Zemb;C. Madic
使用小角X-射线散射，电导率，和相行为测定，我们表明，浓缩溶液的molanamide萃取剂，二甲基二丁基十四烷基丙二酰胺（DMDBTDMA），组织在反向低聚物聚集体有许多共同的特点与反胶束。这些反向球状聚集体的聚集数以及它们的相互作用势是由绝对散射曲线确定的。当与过量油平衡时，吸引相互作用负责油相的分层。预测电导率以及第三相的形成条件是可能的，使用标准液体理论适用于萃取剂聚集体。用巴克斯特提出的粘性球模型模拟的相互作用表明，是由于萃取剂分子的疏水尾部和反胶束的高度可极化的水核之间的货车范德华力产生的空间相互作用。有吸引力的互动…
Using small angle X-ray scattering, conductivity, and phase behavior determination, we show that concentrated solutions of molanamide extractants, dimethyldibutyltetradecylmalonamide (DMDBTDMA), are organized in reverse oligomeric aggregates which have many features in common with reverse micelles. The aggregation numbers of these reverse globular aggregates as well as their interaction potential are determined from absolute scattering curves. An attractive interaction is responsible for the demixing of the oil phase when in equilibrium with excess oil. Prediction of conductivity as well as the formation conditions for the third phase is possible using standard liquid theory applied to the extractant aggregates. The interactions, modeled with the sticky sphere model proposed by Baxter, are shown to be due to steric interactions resulting from the hydrophobic tails of the extractant molecule and van der Waals forces between the highly polarizable water core of the reverse micelles. The attractive interacti...