Interfacial tension and wetting behavior of air/oil/ionic liquid systems
Interfacial tension and wetting behavior of air/oil/ionic liquid systems
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DOI：
10.1007/s00396-007-1732-7
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发表时间：
2007-09
影响因子：
2.4
通讯作者：
T. Matsuda;Y. Mishima;S. Azizian;H. Matsubara;T. Takiue;M. Aratono
中科院分区：
文献类型：
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作者：
T. Matsuda;Y. Mishima;S. Azizian;H. Matsubara;T. Takiue;M. Aratono
我们测量了空气/正己烷、正癸烷、1-全氟己烷/1-己基-3-甲基-咪唑六氟磷酸盐体系的界面张力和密度随温度的函数。从空气/离子液体的表面张力值可以看出，咪唑类阳离子和反阴离子之间的库仑相互作用在表面和体积上差别不大。密度值表明，饱和有机物对离子液体表面张力的降低与离子液体与有机物之间的相互溶解度密切相关。油/离子液体界面处的界面张力表明，离子液体分子在油/离子液体界面处比在空气/离子液体界面处更有序，但离子液体界面取向导致的熵的减少被不同化学物质接触导致的熵的增加所补偿。初始扩散系数和Hamaker常数表明，所有油相在空气/离子液体界面自发扩散，形成完整的润湿膜。
We measured the interfacial tension and the density of air/n-hexane,n-decane, 1-perfluorohexane/1-hexyl-3-methyl-imidazolium hexafluorophosphate systems as a function of temperature. From the air/ionic liquid surface tension values, it was suggested that Coulombic interaction between imidazolium cations and counter anions are not so much different between the surface and bulk. The density values indicated that the decrease of surface tension by saturating organics was closely correlated to the mutual solubility between ionic liquid and organics. Interfacial tension at the oil/ionic liquid interfaces suggested that ionic liquid molecules were more ordered at the oil/ionic liquid interfaces compared to the air/ionic liquid interfaces, but the decrease of the entropy due to the interfacial orientation of ionic liquid was compensated by the increase of the entropy due to the contact of different chemical species. The initial spreading coefficients and the Hamaker constants indicated that all the oil phases spread at the air/ionic liquid interfaces spontaneously, and form the complete wetting films.