Surface tensions for the 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Pedro J. Carvalho (Author) Other; Mara G. Freire (Author) Other; Isabel M. Marrucho (Author) Other; António J. Queimada (Author) FEUP; João A. P. Coutinho (Author) Other

Journal

Title: Journal of Chemical & Engineering Data

Vol. 53 No. 6

Pages: 1346-1350

ISSN: 0021-9568

Publisher: American Chemical Society

Indexing

Scopus

COMPENDEX

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

DOI: 10.1021/je800069z

Abstract (EN): This work addresses surface tension measurements of eight imidazolium-based ionic liquids (ILs) with the bis(trifluoromethylsulfonyl)imide, Tf2N, common anion, and their dependence with temperature, from (293 to 353) K, at atmospheric pressure. The set of selected ionic liquids was chosen to provide a detailed and comprehensive study of the influence of the cation alkyl chain length on the surface tensions of the ionic liquids based on the Tf2N anion. It is shown that, unlike other ionic liquids, the surface tensions of the Tf2N family do not have a linear decrease with the chain length. The surface thermodynamic functions such as surface entropy and enthalpy were derived from the temperature dependence of the surface tension, and their values indicate the importance of the surface ordering in ionic liquids. The use of the Guggenheim and Eötvos correlations for the estimation of the critical temperatures of ionic liquids is discussed, and the applicability of the Stefan rule to ionic liquids is analyzed.

Language: English

Type (Professor's evaluation): Scientific