Surface Structures of Binary Mixture of Ionic Liquids.

0470150 - ÚCHP 2017 RIV NL eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR(CZ) GA16-12291S
Institucionální podpora: RVO:67985858
Klíčová slova: ionic liquids * mixture * surface structure
Obor OECD: Physical chemistry
Impakt faktor: 4.513, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0269447