Revealing the influence of the strength of coulomb interactions on the viscosity and interfacial tension of ionic liquid cosolvent mixtures

Journal article
(Original article)


Publication Details

Author(s): Fröba AP, Wasserscheid P, Gerhard D, Kremer H, Leipertz A
Journal: Journal of Physical Chemistry B
Publisher: American Chemical Society
Publication year: 2007
Volume: 111
Pages range: 12817-12822
ISSN: 1520-6106
eISSN: 1520-5207
Language: English


Abstract


Within this work, viscosity and interfacial tension of selected ionic liquid cosolvent mixtures, [EMIM] [EtOSO(3)] (1-ethyl-3-methyl-immidazolium ethyl sulfate) with water and ethanol, were studied as a function of composition by surface light scattering (SLS) and the pendant drop method in a consistent manner, allowing a close insight into the nature of interactions. Here, we show that the viscosity behavior clearly reflects the bulk structure of the ionic liquid cosolvent mixtures and correlates to the fluid structure at the phase boundary. In contrast to former work, we found the viscosity of ionic liquid [EMIM][EtOSO(3)] to be decreasing the stronger by small amounts of the cosolvents and the lower their dielectric constant. Furthermore, two distinct trends for the dependence of the viscosity on the cosolvent concentration were resolved. These were assigned to ion-dipole interactions dominating in the salt-rich region and to dipole-dipole interactions in the diluted one. A crossover between both regions is reflected by the interfacial tension data, where it seems that up to a "critical" concentration almost no cosolvent is present at the phase boundary.



FAU Authors / FAU Editors

Fröba, Andreas Paul Prof. Dr.-Ing.
Lehrstuhl für Advanced Optical Technologies - Thermophysical Properties
Leipertz, Alfred Prof. Dr.-Ing.
Lehrstuhl für Technische Thermodynamik
Wasserscheid, Peter Prof. Dr.
Lehrstuhl für Chemische Reaktionstechnik


Additional Organisation
Erlangen Graduate School in Advanced Optical Technologies


How to cite

APA:
Fröba, A.P., Wasserscheid, P., Gerhard, D., Kremer, H., & Leipertz, A. (2007). Revealing the influence of the strength of coulomb interactions on the viscosity and interfacial tension of ionic liquid cosolvent mixtures. Journal of Physical Chemistry B, 111, 12817-12822. https://dx.doi.org/10.1021/jp074799d

MLA:
Fröba, Andreas Paul, et al. "Revealing the influence of the strength of coulomb interactions on the viscosity and interfacial tension of ionic liquid cosolvent mixtures." Journal of Physical Chemistry B 111 (2007): 12817-12822.

BibTeX: 

Last updated on 2019-18-07 at 07:33