Measurement of the Interfacial Tension in an Ionic Liquid鈥揇ielectric Liquid System Using an Electrically Deformed Droplet

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• 作者：Dong Woog Lee ; Do Jin Im ; In Seok Kang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 21, 2013
• 年：2013
• 卷：117
• 期：7
• 页码：3426-3430
• 全文大小：247K
• 年卷期：v.117,no.7(February 21, 2013)
• ISSN：1932-7455

文摘

The unique chemical and physical properties of ionic liquids (ILs) are attracting an increasing amount of interest in energy and biological fields. However, some physicochemical properties of ILs are not well-known. Here, we present an alternative method for the measurement of the interfacial tension in an IL鈥揹ielectric liquid system by means of the small deformation of a charged IL droplet in a dielectric medium. Using the pendant drop method, the validity of the proposed measurement method is confirmed. The interfacial tension between ILs and silicone oil has been found to be lower than that between water and silicone oil, and the tension is negatively correlated to the size of the IL ion. Further analyses of Girifalco-Good鈥檚 interaction parameters of the two liquid鈥搇iquid systems demonstrate that the lower interfacial tension of IL can be attributed to the stronger intermolecular interaction between IL and silicone oil molecules. Due to a universal feature of the interaction parameter for a given class of liquid鈥搇iquid systems, it can provide an approximate estimate of the interfacial tension without a direct measurement.