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. 2015 Nov 19;5(4):752–771. doi: 10.3390/membranes5040752

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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ATR-FTIR spectra at 3000–3240 cm⁻¹ frequency range for (A) pure ILs; (B) salt free IL-GPEs; and (C) IL- ZnTf₂ GPEs 4. The legend indicates the IL names.