title: Structure of aqueous solutions of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate by small-angle neutron scattering.
abstract: The structure of aqueous solutions of a prototype ionic liquid, the short alkyl chain 1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4]) has been investigated by small-angle neutron scattering. Concentration fluctuations and Kirkwood-Buff integrals have been calculated, and the results are in good agreement with corresponding data calculated herein from vapor pressure measurements. The large concentration fluctuations and Kirkwood-Buff integral values indicate that the system is in the vicinity of phase separation, which is known to occur some 20 K below room temperature, at a salt mole fraction of around 0.075.
authors.affiliation: Department of Engineering Physics and Mathematics, Helsinki University of Technology, Espoo, Finland.
authors.forename: L
authors.initials: L
authors.lastname: Almásy
authors.forename: M
authors.initials: M
authors.lastname: Turmine
authors.forename: A
authors.initials: A
authors.lastname: Perera