Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9577860 | Chemical Physics Letters | 2005 | 6 Pages |
Abstract
Surface of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) + water mixture is investigated using surface tension measurement and sum-frequency generation spectroscopy. The liquid surface is mostly covered by the [BMIM]+ cations at very low bulk concentration. An unusual increase in surface tension from mole fraction c â 0.016 up to â0.05 suggested that the BF4- anions start to appear at the surface from c â 0.016 until the anions and cations are equally populated at c â 0.05 or higher. From the analysis of the spectra, the terminal methyl group of the butyl chain in the cation is polar-oriented with its symmetry axis aligning rather vertical to the surface for the whole range of concentration.
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Authors
Jaeho Sung, Yoonnam Jeon, Doseok Kim, Takashi Iwahashi, Toshifumi Iimori, Kazuhiko Seki, Yukio Ouchi,