Acoustic and volumetric properties of aqueous solutions of imidazolium based ionic liquids at 298.15 K

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• 作者：Ramesh L. Gardas ; Dilip H. Dagade ; Santosh S. Terdale ; Joã ; o A.P. Coutinho ; Kesharsingh J. Patil
• 关键词：Ionic liquids ; Density ; Speed of sound ; Apparent molar volume ; Isentropic compressibility
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：40
• 期：4
• 页码：695-701
• 全文大小：164 K

文摘

The experimental measurements of the speed of sound and density of aqueous solutions of imidazolium based ionic liquids (IL) in the concentration range of 0.05 mol · kg⁻¹ to 0.5 mol · kg⁻¹ at T = 298.15 K are reported. The data are used to obtain the isentropic compressibility (β_S) of solutions. The apparent molar volume (http://www.sciencedirect.com/scidirimg/entities/3d5.gif"" alt=""phi"" title=""phi"" border=""0"">_V) and compressibility href=""/science?_ob=MathURL&_method=retrieve&_udi=B6WHM-4R17V2W-1&_mathId=mml7&_user=1067359&_cdi=6854&_rdoc=20&_acct=C000050221&_version=1&_userid=10&md5=8c643c26ec2c8802ac4fb729f6ad1eff"" title=""Click to view the MathML source"" alt=""Click to view the MathML source"">(http://www.sciencedirect.com/scidirimg/entities/3d5.gif"" alt=""phi"" title=""phi"" border=""0"">_KS) of ILs are evaluated at different concentrations. The data of limiting partial molar volume and compressibility of IL and their concentration variation are examined to evaluate the effect due to IL–water and IL–IL interactions. The results have been discussed in terms of hydrophobic hydration, hydrophobic interactions, and water structural changes in aqueous medium.