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Accueil > Publications > Recherche par années > Années 2000 > 2007

Rollet, AL ; Porion, P ; Vaultier, M ; Billard, I ; Deschamps, M ; Bessada, C ; Jouvensal, L

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

Journal of Physical Chemistry B 111 11888-11891

par Administrateur - publié le

Abstract :

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.