Impact of polyethyleneglycol addition on diffusion coefficients in binary ionic liquid electrolytes composed of dicationic ionic liquid and polyethyleneglycol

Magnetic Resonance in Chemistry : MRC
Tzi-Yi WuYi-Hsuan Tung

Abstract

We conduct a comparative study of conductivity and diffusion coefficient of two dicationic ionic liquids (3,3'-(octane-1,8-diyl)bis(1-ethyl-3-imidazolium) bis(trifluoromethylsulfonyl)amide ([IMCI][TFSI], S1) and 3,3'-(2,2'-(ethane-1,2-diylbis(oxy))bis(ethane-2,1-diyl))bis(1-ethyl-3-imidazolium) bis(trifluoromethylsulfonyl)amide ([IMOI][TFSI], S2)) at various temperatures. The diffusion coefficients of cation and anion in ionic liquids are determined by using pulse gradient spin-echo nuclear magnetic resonance method. S2 shows lower viscosity, higher conductivity, and higher diffusion coefficient than those of S1. Moreover, the influence of polyethyleneglycol (PEG200, Mw  = 200) addition in PEG200/IL binary solutions is investigated. PEG200/S1 binary solutions show lower viscosity, higher conductivity, and higher diffusion coefficient than those of neat S1. The experimental molar conductivity (Λ) of neat IL and PEG200/IL binary solutions is lower than that of the calculated molar conductivity (ΛNMR ) from pulse gradient spin-echo nuclear magnetic resonance method at various temperatures, indicating that not all the diffusion species belong to the ionic conduction. In other words, NMR diffusion measurements comprise charged and p...Continue Reading

References

Oct 8, 2014·Magnetic Resonance in Chemistry : MRC·Bradley J ButlerJason B Harper
Oct 30, 2014·Magnetic Resonance in Chemistry : MRC·Jesse Allen, Krishnan Damodaran
Mar 19, 2015·Magnetic Resonance in Chemistry : MRC·Takatsugu EndoSabyasachi Sen
Apr 14, 2016·International Journal of Molecular Sciences·Yongjun MenJiayin Yuan
May 20, 2016·International Journal of Molecular Sciences·Alexandra Alvarez Fernandez, Paul H J Kouwer

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