Diffusivity and Structure of Room Temperature Ionic Liquid in Various Organic Solvents

Abstract

Room-temperature ionic liquids (RTILs) hold promise for applications in electric double layer capacitors (EDLCs), owing to a much wider potential window, lower vapor pressure, and better thermal and chemical stabilities compared to conventional aqueous and organic electrolytes.However, because the low diffusivity of ions in neat RTILs negates the EDLCs' advantage of high power density, the ionic liquids are often used in mixture with organic solvents. In this study, we measured the diffusivity of cations and anions in RTIL, 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl) ([BMIM + ][TFSI -]), mixed with 10 organic solvents, by using the pulsed-field gradient NMR method. The ion diffusivity was found to follow that of neat solvents, and in most studied solvents showed an excellent agreement with the predicted values reported in the recent molecular dynamics (MD) study [

Blistering failure of elastic coatings with applications to corrosion resistance

“…The equation of the semi-empirical fit is 4. The trend of increasing mobility with decreasing fraction of soluble components is consistent with observations made in the literature [51,52,53] for a fairly broad range of solute-solvent pairs. (b) The Young's modulus of polyurethane is found to vary linearly with strain rate at low strain rates.…”

“…The data used to fit the diffusivity of water in polyurethane is recorded for posterity in the supporting information. [62,63,64] for a fairly broad range of solute-solvent pairs. (b) The Young's modulus of polyurethane is found to vary linearly with strain rate at low strain rates.…”

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“…In another example,55 the diffusivities of ions in organic solvents were screened for 22 different solvents, revealing a pattern in this large data set (ion diffusivity proportional to solvent diffusivity) that was in contrast with previous, primarily experimental findings (ion diffusivity proportional to solvent dipole moment). The computational screening finding were confirmed in subsequent experimental studies utilizing quasi-elastic neutron scattering56 and NMR 57. 3.5 | Expanding MoSDeFAs noted earlier, the genesis of MoSDeF was a series of NSF grants to Vanderbilt PIs Cummings, M c Cabe, Iacovella, and Ledezci [41][42][43].…”

“…The computational screening finding were confirmed in subsequent experimental studies utilizing quasi-elastic neutron scattering 56 and NMR. 57…”

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“…[ 66 ] Pulsed field gradient NMR experiments were performed to measure the coefficients of self‐diffusion in both samples, as per analysis done in ref. [ 67 ] . These results are shown in Figure S10b (Supporting Information), and provide direct evidence whether the interaction between the FSI − anion and the AlF 3 surface leads to slower transport.…”