Density, Speed of Sound, and Derived Thermodynamic Properties of Ionic Liquids over an Extended Pressure Range. 4. [C3mim][NTf2] and [C5mim][NTf2]

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• 作者：Jos&eacute ; M. S. S. Esperanç ; a ; Zoran P. Visak ; Natalia V. Plechkova ; Kenneth R. Seddon ; Henrique J. R. Guedes ; Luí ; s P. N. Rebelo
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2006
• 出版时间：November 2006
• 年：2006
• 卷：51
• 期：6
• 页码：2009 - 2015
• 全文大小：129K
• 年卷期：v.51,no.6(November 2006)
• ISSN：1520-5134

文摘

The current study focuses on 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [C₃mim][NTf₂],and 1-pentyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [C₅mim][NTf₂]. The objective is to studythe influence of pressure as well as that of the cation's alkyl chain length on several properties of this type ofionic liquids. Speed of propagation of ultrasound waves and densities in pure ionic liquids as a function oftemperature and pressure have been determined. Other thermodynamic properties such as compressibilities andexpansivities have been obtained. Speed of sound measurements have been carried out in broad ranges oftemperature (298 < T/K < 338) and pressure (0.1 < p/MPa < 200). A novel high-pressure ultrasonic cell wasdesigned and built to allow for precise speed of sound measurements in liquids. The uncertainty of the speed ofsound measurements is 0.05 %. A detailed description of the cell is presented. Density measurements have beenperformed over a broad range of temperature (298 < T/K < 333) and pressure (0.1 < p/MPa < 60) using avibrating-tube densimeter. The density overall uncertainty is 0.02 %.