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Initial dissolution of D₂O at the gas-liquid interface of the ionic liquid [C₄min][NTf2] associated with

H Ohoyama¹, T Teramoto²

¹Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. ohyama@chem.sci.osaka-u.ac.jp.

Physical Chemistry Chemical Physics : PCCP

|October 7, 2016

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: ΔH_l = -53 ± 8 kJ mol^-1, ΔS_l = -210 ± 30 J mol^-1 K^-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.

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