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NMR and Rheological Study of Anion Size Influence on the Properties of Two Imidazolium-based Ionic Liquids

Abstract : NMR self-diffusion and relaxation, coupled with viscosity, were used to study the properties and structure of two imidazolium-based ionic liquids, 1-ethyl-3-methylimidazolium acetate [C2MIM][OAc] and 1-ethyl-3-methylimidazolium octanoate [C2MIM][OOct]. The experimental results point to the formation of different types of aggregates in each ionic liquid. These aggregates are small and stable under flow and temperature in [C2MIM][OAc], whereas the aggregates are large and sensitive to flow and temperature in [C2MIM][OOct]. In the latter case the size of aggregates decreases both under flow and temperature increase.
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Stephen M Green, Michael E. Ries, Jamie Moffat, Tatiana Budtova. NMR and Rheological Study of Anion Size Influence on the Properties of Two Imidazolium-based Ionic Liquids. Scientific Reports, Nature Publishing Group, 2017, 7, pp.8968. ⟨10.1038/s41598-017-09509-2⟩. ⟨hal-01647843⟩

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