Ionic liquid mixtures—variations in physical properties and their origins in molecular structure

Annat, Gary, Forsyth, Maria and MacFarlane, Douglas R. 2012, Ionic liquid mixtures—variations in physical properties and their origins in molecular structure, Journal of physical chemistry B, vol. 116, no. 28, pp. 8251-8258, doi: 10.1021/jp3012602.

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Title Ionic liquid mixtures—variations in physical properties and their origins in molecular structure
Author(s) Annat, Gary
Forsyth, MariaORCID iD for Forsyth, Maria
MacFarlane, Douglas R.
Journal name Journal of physical chemistry B
Volume number 116
Issue number 28
Start page 8251
End page 8258
Total pages 8
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2012
ISSN 1520-6106
Summary In order to explore the various possible property trends in ionic liquid mixtures, five different ionic liquids were mixed with N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([C3mpyr][NTf2]), and the viscosities, excess molar volumes, ionic conductivities, and phase diagrams of the mixtures were determined over a range of temperatures. In a number of the mixtures the crystallization of both components was completely suppressed and no melting point was observable. Such mixtures of similar ionic liquids thus have potential for use in low-temperature applications by extending the liquid range to Tg. The molar conductivities and viscosities are described as approximating predictable or “simple” mixing behaviors, while excess molar volumes were found to show a variety of mixing and nonideal mixing effects. Mixture equations for viscosity and conductivity are discussed and analyzed. An immiscibility window was observed in the trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)amide ([P6,6,6,14][NTf2]) in the [C3mpyr][NTf2] system in the [C3mpyr][NTf2]-rich region. Unusual physical properties are exhibited by miscible compositions near the demixing line. These compositions are described as [P6,6,6,14][NTf2]-like, even up to 0.5 mol fraction of [C3mpyr][NTf2].
Language eng
DOI 10.1021/jp3012602
Field of Research 030304 Physical Chemistry of Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, American Chemical Society
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