Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 150, Issue 1-3, Pages 16-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2009.09.004
Keywords
Simultaneous X-ray diffraction and DSC measurements; Room temperature ionic liquids; Raman spectroscopy; Nearly-free hydrogen bonded water
Ask authors/readers for more resources
Phase behavior of room temperature ionic liquid (RTIL)-H2O mixtures (x = 0.0-98.5 mol% H2O) was investigated by in-situ observations of simultaneous X-ray diffraction and differential scanning calorimetry method, and Raman spectroscopy: The RTIL is N, N-diethyl-N-methyl-N-2-methoxyethyl ammonium tetrafluoroborate, [DEME][BF4]. We found that the crystal structure at low temperature is almost the same as that of pure [DEME][BF4] over the whole range of water concentration. Above 60 mol%, H2O crystal appears inside the RTIL crystals. The difference in the enthalpy between the liquid and the solid state was estimated as a function of H2O concentration. In Raman spectra, a nearly-free hydrogen bonded band of H2O appears clearly below 90 mol%. We correlate the existence of nearly-free bonds in the [DEME][BF4]-H2O mixtures with the abrupt change of the enthalpy at around 90 mol%. (C) 2009 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available