Surface tensions of imidazolium based ionic liquids: Anion, cation, temperature and water effect

被引：403

作者：

Freire, Mara G.

Carvalho, Pedro J.

Fernandes, Ana M.

Marrucho, Isabel M.

Queimada, Antonio J.

Coutinho, Joao A. P. ^{[1
]}

机构：

[1] Univ Aveiro, Dept Quim, CICECO, P-3810193 Aveiro, Portugal

[2] Univ Porto, Fac Engn, LSRE, P-4200465 Oporto, Portugal

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2007年 / 314卷 / 02期

关键词：

surface tension; ionic liquids; lmidazolium based ionic liquids; temperature dependence; water content; effective ionic concentration; molar conductivity; critical temperature;

D O I：

10.1016/j.jcis.2007.06.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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][PF6], and one of the more hygroscopic IL, [bmim][PF6]. 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.

引用

页码：621 / 630

页数：10

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