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Article Dans Une Revue Journal of Physical Chemistry B Année : 2007

Anomalous diffusion of water in [BMIM][TFSI] room-temperature ionic liquid.

Résumé

We have studied the self-diffusion properties of butyl-methyl-imidazolium bis(trifluoromethylsulfonyl)-imide ([BMIM][TFSI]) + water system. The self-diffusion coefficients of cations, anions, and water molecules were determined by pulsed field gradient NMR. These measures were performed with increased water quantity up to saturation (from 0.3 to 30 mol %). Unexpected variations have been observed. The self-diffusion coefficient of every species increases with the quantity of water but not in the same order of magnitude. Whereas very similar evolutions are observed for the anion and cation, the increase is 25 times greater for water molecules. We interpret our data by the existence of phase separation at microscopic scale.

Domaines

Matériaux

Dates et versions

hal-00181174 , version 1 (23-10-2007)

Identifiants

Citer

Anne-Laure Rollet, Patrice Porion, Michel Vaultier, Isabelle Billard, Michael Deschamps, et al.. Anomalous diffusion of water in [BMIM][TFSI] room-temperature ionic liquid.. Journal of Physical Chemistry B, 2007, 111 (41), pp.11888-91. ⟨10.1021/jp075378z⟩. ⟨hal-00181174⟩
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