Halide Ions Effects on the Surface Excess of a Long Chain Ionic Liquid.

  • Wang W
  • Sung W
  • Ao M
 et al. 
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Abstract

The interfacial structure and composition of the mixtures of water and alkylimidazolium ionic liquids varying in their halide anions ([C$_{12}$mim][$X$] ($X=$ Cl and I) were investigated by X-ray near-total-reflection fluorescence spectroscopy, and X-ray reflectivity measurements. X-ray fluorescence and reflectivity techniques provide direct measurement of surface adsorption. Furthermore, we demonstrate that for [C$_{12}$mim][Cl] and [C$_{12}$mim][I] solutions with mixed inorganic salts (NaI, NaCl), I$^{-}$ ions replace Cl$^{-}$ above the critical micelle concentration (cmc) of [C$_{12}$mim][Cl] at much lower concentrations of NaI, whereas NaCl concentrations hundred times higher than the cmc of [C$_{12}$mim][I] only partially replace the I$^-$ at the interface. Our surface sensitive X-ray diffraction and spectroscopy provide yet two independent tools to directly determine the surface adsorption of ionic surfactants and the interfacial composition of the surface films.

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Authors

  • Wenjie Wang

  • Woongmo Sung

  • Mingqi Ao

  • Nathaniel Andrew Anderson

  • David Vaknin

  • Doseok Kim

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