Surface tensions of imidazolium based ionic liquids: Anion, cation, temperature and water effect
authors Freire, MG; Carvalho, PJ; Fernandes, AM; Marrucho, IM; Queimada, AJ; Coutinho, JAP
nationality International
journal JOURNAL OF COLLOID AND INTERFACE SCIENCE
author keywords surface tension; ionic liquids; lmidazolium based ionic liquids; temperature dependence; water content; effective ionic concentration; molar conductivity; critical temperature
keywords PHYSICOCHEMICAL PROPERTIES; PHYSICAL-PROPERTIES; ALKYL CHAIN; THERMODYNAMIC PROPERTIES; HYDROGEN-BONDS; MIXTURES; INTERFACE; PRESSURE; EICOSANE; BINARY
abstract This work addresses the experimental measurements of the surface tension of eight imidazolium based ionic liquids (lLs) and their dependence with the temperature (288-353 K) and water content. The set of selected ionic liquids was chosen to provide a comprehensive Study of the influence of the cation alkyl chain length, the number of cation substitutions and the anion on the properties under study. The influence of water content in the surface tension was studied for several lLs as a function of the temperature as well as a function of water mole fraction, for the most hydrophobic IL investigated, [omim][PF(6)], and one of the more hygroscopic IL, [bmim][PF(6)]. The surface thermodynamic functions such as surface entropy and enthalpy were derived from the temperature dependence of the Surface tension values. (c) 2007 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0021-9797
year published 2007
volume 314
issue 2
beginning page 621
ending page 630
digital object identifier (doi) 10.1016/j.jcis.2007.06.003
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000249312800034
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journal impact factor 5.091
5 year journal impact factor 4.281
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