Surface Structures of Binary Mixture of Ionic Liquids.

0470150 - ÚCHP 2017 RIV NL eng J - Journal Article
Nakajima, K. - Nakanishi, S. - Lísal, Martin - Kimura, K.
Surface Structures of Binary Mixture of Ionic Liquids.
Journal of Molecular Liquids. Roč. 230, MARCH (2017), s. 542-549. ISSN 0167-7322. E-ISSN 1873-3166
R&D Projects: GA ČR(CZ) GA16-12291S
Institutional support: RVO:67985858
Keywords : ionic liquids * mixture * surface structure
OECD category: Physical chemistry
Impact factor: 4.513, year: 2017

Surfaces of 11 equimolar mixtures of ionic liquids (ILs) consisting of 1-alkyl3methylimidazoliumcations (from [C2C1Im] to [C12C1Im])with anions (Cl, [BF4], [TfO], [PF6], [Tf2N])were observed using high-resolution Rutherford backscattering spectroscopy (HRBS). The elemental depth profiles of these IL mixtureswere derived fromthe observed HRBS spectra through spectrum modeling. By comparing the observed depth profiles with those of pure ILs, the surface mole fractions of constituent ILs were estimated. We found a general tendency that larger IL is enriched at the surface. The observed surface enrichment can be reasonablywell reproduced by a simple thermodynamic calculation based on the Sprow-Prausnitz equation. A slight deviation from the calculated resultwas ascribed to the nonideal behavior of the IL mixtures, which was neglected in the calculation.
Permanent Link: http://hdl.handle.net/11104/0269447