Abstract
Physicochemical properties, including viscosity and density, of silver salt-containing ionic liquids were measured and used to rationalize the permeability of ethane, ethylene, and helium through supported ionic liquid membranes (SILMs). Mixtures investigated included 1-hexyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl)imide ([hmim][Tf2N]) and 1-hexyl-3-methylimidazolium nitrate ([hmim][NO3]) and their corresponding silver salts. The gas transport properties were very different for the two different ionic liquid/silver salt mixtures, consistent with very different behavior of viscosity and density upon silver salt dissolution. The distinctive dependence of both viscosity and density on temperature and silver salt concentration suggests different interion interactions and molecular arrangements in the two ionic liquids. Free volume and physical/chemical interactions between the anion and the gas solutes are critical in determining gas permeabilities.
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