Microemulsions with the ionic liquid ethylammonium nitrate: phase behavior, composition, and microstructure.
Microemulsions with the ionic liquid ethylammonium nitrate: phase behavior, composition, and microstructure.
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DOI：
10.1021/la501899c
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
Jan C Thater;Violaine Gérard;C. Stubenrauch
中科院分区：
文献类型：
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作者：
Jan C Thater;Violaine Gérard;C. Stubenrauch
在本研究中，我们研究了由离子液体 (IL) 硝酸乙铵 (EAN)、非离子表面活性剂 C12E3 和正烷烃（即正十二烷或正辛烷）组成的微乳液的性质。共存相的组成由各相的密度和体积计算。由于传统微乳液（含水和油）中富水相和富油相之间的界面张力与微观结构有关，因此使用旋转液滴张力测定法来测量界面张力 σab 并估计域尺寸。最后，通过傅里叶变换脉冲梯度自旋回波 (FTPGSE) NMR 技术测量所有成分的自扩散系数，可以区分连续结构和离散结构。我们的结果表明，水-正烷烃-CiEj 微乳液的一般原理确实可以转移到油包 EAN 液滴和各自的双连续微乳液中，而对于油包 EAN 液滴微乳液观察到差异。
In this study, we investigate properties of microemulsions which consist of the ionic liquid (IL) ethylammonium nitrate (EAN), the nonionic surfactant C12E3 and an n-alkane, namely n-dodecane or n-octane. The compositions of the coexisting phases are calculated from the densities and volumes of the respective phases. Since the interfacial tension between the water-rich and the oil-rich phase in traditional microemulsions (containing water and oil) relates to the microstructure, spinning drop tensiometry is used to measure the interfacial tension σab and to estimate the domain sizes. Finally, measuring the self-diffusion coefficients of all components via the Fourier Transform Pulsed Gradient Spin Echo (FTPGSE) NMR technique allowed distinguishing between continuous and discrete structures. Our results indicate that the general principles underlying water-n-alkane-CiEj microemulsions can indeed be transferred to oil-in-EAN droplet and the respective bicontinuous microemulsions, while differences are observed for EAN-in-oil droplet microemulsions.