Phase Behavior and Microstructure of Symmetric Nonionic Microemulsions with Long-Chain n-Alkanes and Waxes
Phase Behavior and Microstructure of Symmetric Nonionic Microemulsions with Long-Chain n-Alkanes and Waxes
复制标题
长链正构烷烃和蜡对称非离子微乳液的相行为和微观结构
DOI：
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发表时间：
2019
影响因子：
4.2
通讯作者：
T. Sottmann
中科院分区：
文献类型：
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作者：
Kristina Schneider;Timm Ott;R. Schweins;H. Frielinghaus;O. Lade;T. Sottmann
微乳液是热力学上稳定的宏观各向同性混合物，由至少两个不相容的组分和一种表面活性剂组成。它们的一般特征，即复杂的相行为、超低的界面张力和多种多样的纳米结构，在上个世纪得到了系统的阐明。然而，长链正构烷烃和石蜡的有效增溶在提高石油采收率、洗涤和化妆品方面发挥着重要作用，仍然是一个挑战。因此，本文研究了正构烷烃链长k对等体积油水三元(对称)微乳液相行为的影响。用从正十二烷(C12H26)到正十二烷(C32H66)的正构烷烃和纯的正构烷基聚乙二醇醚(CiEj)，发现它们的效率随着k的增加而线性下降，而相转变温度(Pit)则呈对数关系。一种工艺蜡对PH值的影响。
Microemulsions are thermodynamically stable, macroscopically isotropic mixtures of at least two immiscible components and a surfactant. Their general features, i.e. the complex phase behavior, the ultralow interfacial tensions, and the multifarious nanostructure, have been systematically elucidated in the last century. However, the efficient solubilization of long-chain n-alkanes and waxes, which plays a significant role in enhanced oil recovery, washing, and cosmetics, remains a challenge. Thus, in this work the influence of the n-alkane chain length k on the phase behavior of ternary (symmetric) microemulsions containing equal volumes of water and oil was studied. Using n-alkanes ranging from n-dodecane (C12H26) to n-dotriacontane (C32H66) and pure n-alkyl polyglycol ether (CiEj) surfactants, we found that the efficiency of the respective surfactant decreases linearly with increasing k, while the phase inversion temperature (PIT) shows a logarithmic dependence. The influence of a technical wax on the ph...