- Title
- Rheology of protic ionic liquids and their mixtures
- Creator
- Smith, J. A.; Webber, Grant B.; Warr, Gregory G.; Atkin, Rob
- Relation
- FT120100313 | DP130102298
- Relation
- Journal of Physical Chemistry B Vol. 117, Issue 44, p. 13930-13935
- Publisher Link
- http://dx.doi.org/10.1021/jp407715e
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2013
- Description
- The rheological properties of five pure protic ionic liquids (ILs), ethylammonium nitrate (EAN), propylammonium nitrate (PAN), ethanolammonium nitrate (EtAN), ethylammonium formate (EAF), and dimethylethylammonium formate (DMEAF), are characterized and interpreted by considering the effects of both the H-bond network and the solvophobic nanostructure of the liquids. The results demonstrate that these effects are not, however, independent or simply additive. At 20 °C, EtAN has the highest zero shear viscosity of 156.1 mPa·s, followed by PAN (89.3 mPa·s), EAN (35.9 mPa·s), EAF (23.1 mPa·s), and DMEAF (9.8 mPa·s). The primary ammonium ILs behave as Newtonian fluids at low shear rates but shear thin at high shear. Fits to the Vogel–Fulcher–Tammann model reveal that nanostructure is not affected appreciably by temperature and that all the ILs studied are of intermediate fragility. The rheology of binary mixtures of these ILs was analyzed and used to demonstrate fundamental differences in the way IL cations and anions interact. IL mixtures containing both nitrate and formate anions resist flow more strongly than the pure liquids, which is a consequence of the difference in hydrogen bonding capacity of the anions. Mixing cations can give rise to complex behavior due to the offsetting effects of hydrogen bonding and solvophobic nanostructure formation.
- Subject
- ionic liquids; nanostructure; H-bond network
- Identifier
- http://hdl.handle.net/1959.13/1039636
- Identifier
- uon:13682
- Identifier
- ISSN:1520-6106
- Rights
- This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry B, copyright ©2013 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jp407715e
- Language
- eng
- Full Text
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