| Abstract
| - The structure of aqueous solutions of a prototype ionic liquid, the short alkyl chain 1-butyl-3-methylimidazoliumtetrafluoroborate ([C4mim][BF4]) has been investigated by small-angle neutron scattering. Concentrationfluctuations and Kirkwood−Buff integrals have been calculated, and the results are in good agreement withcorresponding data calculated herein from vapor pressure measurements. The large concentration fluctuationsand Kirkwood−Buff integral values indicate that the system is in the vicinity of phase separation, which isknown to occur some 20 K below room temperature, at a salt mole fraction of around 0.075.
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