title: Initial dissolution of D2O at the gas-liquid interface of the ionic liquid [C4min][NTf2] associated with hydrogen-bond network formation.
abstract: We have studied the initial dissolution of D2O at the interfacial surface of the flowing jet sheet beam of the ionic liquid (IL) [C4min][NTf2] using the King and Wells method as a function of both the temperature and collision energy of the IL. The initial dissolution probability of D2O into the IL [C4min][NTf2] was found to follow the general propensity that the solubility of gases into a liquid decreases with temperature. However, a large partial molar enthalpy and entropy for the initial dissolution of D2O in the IL [C4min][NTf2] were observed from the temperature dependence of the initial dissolution probability: ΔHl= -53 ± 8 kJ mol-1, ΔSl= -210 ± 30 J mol-1K-1. In addition, it was found that the collision energy significantly reduced the initial dissolution probability. We propose that the associated D2O molecules at the interface of the IL [C4min][NTf2] make a hydrogen-bond network around the [NTf2]-anion before dissolution into the deeper portion of the interface layer.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. ohyama@chem.sci.osaka-u.ac.jp.
authors.forename: H
authors.initials: H
authors.lastname: Ohoyama
authors.affiliation: Department of Electrical & Electronic Engineering, College of Science & Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Teramoto