(178b) Influence Of Water On Diffusion In Ionic Liquids: Pulsed Field Gradient NMR Study
AIChE Annual Meeting
2007 Annual Meeting
Engineering Sciences and Fundamentals
Ionic Liquids: Thermodynamics and Transport
Tuesday, November 6, 2007 - 8:55am to 9:20am
Room temperature ionic liquids (ILs) have attracted increasing interest of the scientific community due to their unique properties such as low vapor pressure and favorable solvation properties. These properties open a possibility of applications of ILs as heat-transfer fluids and as solvents in synthesis, catalysis and separations. ILs can easily absorb water from atmosphere. Therefore, it is important to understand an influence of water on diffusion and related nanostructure of ionic liquids. In this work we have applied a novel pulsed field gradient (PFG) NMR technique, which combines advantages of high filed (750 MHz) NMR and high (up to 30 T/m) magnetic filed gradients, to study diffusion of anions, cations and water in 1-ethyl-3-methylimidazoluim-based ILs under the same conditions. PFG NMR studies have been performed in a broad range of temperatures and for different diffusion times. The relationship between studied transport properties and structural properties will be discussed.