Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 112, Issue 8, Pages 2382-2387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp076185e
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The structure of aqueous solutions of a prototype ionic liquid, the short alkyl chain 1-butyl-3-methylimidazoliumtetrafluoroborate([C(4)mim][BF(4)]) 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.
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