环氧乙烷
环氧丙烷
肺表面活性物质
表面张力
化学
电解质
哑铃
烷基
氧化物
吸附
化学工程
分子
乙醚
有机化学
物理化学
热力学
聚合物
生物化学
医学
物理
工程类
共聚物
物理疗法
电极
作者
Zhongsheng Wang,Zhaohui Zhou,Lu Han,Chao Xu,Hongbo He,Qun Zhang,Zhicheng Xu,Qi Gong,Lei Zhang,Guiyang Ma
标识
DOI:10.1016/j.molliq.2022.119364
摘要
In this work, the interfacial tensions (IFTs) of a series of alkyl ether carboxylates containing different ethylene oxide (EO) and propylene oxide (PO) groups (C12PO15EO5C, C12PO15EO10C and C12PO15EO15C) against n-alkanes were investigated. Based on the experimental and theoretic results, we find that for adsorbed extended surfactant molecules with both PO and EO groups, the PO group stretches towards the oil phase in a helical winding manner, which improves the size of hydrophobic part and decreases IFT. On the other hand, the whole EO group arranges in an “L” pattern with 4 EO flat at the interface and the others stretching into the water. The “dumbbell” type with the large size of the ionic head and PO group at both ends and the linear EO chain in the middle results in the high IFT values. Therefore, a sufficient PO number and few EO number are prerequisites for obtaining ultralow IFT. The addition of NaCl can decrease the size of anionic head and C12PO15EO5C solution can produce ultralow IFT against hydrocarbons at optimized salinity. However, electrolyte shows little effect on the IFTs of extended surfactants with “dumbbell” conformation at the interface because the size of linear EO group plays the crucial role. Our research has important implications for the in-depth understanding of extended surfactants and their application in high-salt reservoirs.
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