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- Title
Anomalous Mixing State in Room-Temperature Ionic Liquid-Water Mixtures: N, N-diethyl- N-methyl- N-(2-methoxyethyl) Ammonium Tetrafluoroborate.
- Authors
Aono, Masami; Imai, Yusuke; Ogata, Yosuke; Abe, Hiroshi; Goto, Takefumi; Yoshimura, Yukihiro; Takekiyo, Takahiro; Matsumoto, Hitoshi; Arai, Takashi
- Abstract
The mixing states of room-temperature ionic liquid (RTIL) HO mixtures ( x = 0.0 mol pct to 99.5 mol pct HO) were investigated using wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS), and optical absorption in an ultraviolet and visible (UV-vis) region. The RTIL is N, N-diethyl- N-methyl- N-(2-methoxyethyl) ammonium tetrafluoroborate, [DEME][BF]. In a 'prepeak' region of the WAXS, the scattered intensities increased at 85 mol pct to 95 mol pct. A medium-range order (MRO) in the liquid structure as observed in network-forming materials developed markedly. In the SAXS experiments, we can detect nanoscale fluctuations relating to polar and nonpolar regions. At 65 mol pct to 85 mol pct, the SAXS intensity increased unexpectedly. Furthermore, entirely different optical absorption spectra in the UV-vis region were observed as a macroscopic property from 90 mol pct to 95 mol pct. We suppose that these anomalies relate to the MRO of the liquid structure. All anomalies probably are induced by an intrinsic property in [DEME][BF]-HO mixtures.
- Subjects
IONIC liquids; X-ray scattering; LIGHT absorption; SIMULATION methods &; models; STATISTICAL correlation; FOURIER transform spectroscopy; DENSITY functionals
- Publication
Metallurgical & Materials Transactions. Part A, 2011, Vol 42, Issue 1, p37
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-010-0311-6