An experimental study on the surface properties of Protic Morpholinium-based ionic liquids

作者：Ghatee Mohammad Hadi^*; Ghaed sharaf Tahereh

来源：Journal of Molecular Liquids, 2017, 241: 694-703.

DOI：10.1016/j.molliq.2017.06.045

• Capillary rise method and contact angle
• Critical temperature
• Density and surface tension measurement
• Protic mopholinium-based ionic liquids
• Surface entropy and energy

In this work, ten novel protic morpholinium-based ionic liquids (ILs) with alkyl-carboxylate anion were synthesized and their densities and surface tensions were measured in the range 298.15 to 348.15 K. Surface tension was measured by capillary rise method, while the capillary apparatus facilitates measurement at liquid/vapor interface with very low water content and in the absence of water vapor. The meniscus contact angles were also measured under the same condition. The surface tension of each IL demonstrates highly accurate linear correlation with temperature, allowing the surface thermodynamics surface entropy and surface energy) to be evaluated accurately. From surface tension values, the critical point was estimated by Guggenhiem and Eotviis equations. Surface tension, density and contact angle of all ILs decrease linearly by increasing temperature and their variation is sharp for the anion with short alkyl chain length and smooth for long ones.

• 出版日期2017-9