Macroscopic and Microscopic Study of 1-Ethyl-3-methyl-imidazolium Acetate–DMSO Mixtures
- Radhi, Asanah
- Le, Kim Anh
- Ries, Michael E.
- Budtova, Tatiana
DOIAbstract
International audienceMacroscopic (steady-state viscosity, density) and microscopic (NMR chemical shifts, 1H NMR relaxation times, and diffusion) properties of the 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) -dimethyl sulfoxide (DMSO) mixture were studied in detail as a function of DMSO molar fraction at various temperatures. Temperature dependencies were used to calculate the activation energies. NMR results indicate that at low molar fraction of DMSO (<0.4), it weakly associates with the cation and in doing so disrupts the strong ion-ion association that exists in the pure ionic liquid. Stokes -Einstein equation, which linearly correlates the diffusion coefficient of a spherical molecule and macroscopic viscosity, was shown to work ...
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