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题名: Successive Adsorption of Cations and Anions of Water-1-Butyl-3-methylimidazolium Methylsulfate Binary Mixtures at the Air-Liquid Interface Studied by Sum Frequency Generation Vibrational Spectroscopy and Surface Tension Measurements
作者: Deng, Gang-Hua1; Li, Xia2, 3; Liu, Shilin1; Zhang, Zhen2; Lu, Zhou2; Guo, Yuan1, 2, 3
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2016-06-09
卷: 120, 期:22, 页:12032-12041
收录类别: SCI
英文摘要: We have investigated the surface behavior of 1-butyl-3-methylimidazolium methylsulfate ([bmim][MS]) aqueous solutions by sum frequency generation vibrational spectroscopy (SFG-VS) and surface tension measurements, including the adsorption of ions and its relationship with surface tension. At very low [bmim] [MS] concentrations, SFG-VS data indicate that with increasing mole fraction of [bmim] [MS], adsorption of cations at the interface rapidly increases, whereas the surface tension the decreases. When cation adsorption to the surface is close to saturation, the change of the surface tension tends to be gradual. When the mole fraction of [bmim][MS] reaches 0.1, anions begin to adsorb to the interface, leading to the changes of the orientation angle of cations and the aggregation behavior of cations and anions at the interface. The previously reported unusual minimum point in the surface tension curve of [bmim] [BF4] aqueous solution suggested to be caused by successive adsorption of cations and anions was not observed for [bmim] [MS] aqueous solution. SFG-VS spectra and the surface tension curve of [bmim] [MS] aqueous solution indicate that anion adsorption does not significantly affect the surface tension. These results provide important information about the surface behavior of ionic liquid aqueous solutions and the effect of adsorption of ions on the surface tension.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35749
Appears in Collections:分子反应动力学实验室_期刊论文

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作者单位: 1.Univ Sci & Technol China, iChEM Collaborat Innovat Ctr Chem Energy Mat, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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