Neutral impact collision ion scattering spectroscopy (NICISS) was used to determine the surface structure of three ionic liquids, 1-hexyl-3- methylimidazolium [C6mim], 1-octyl-3-methylimidazolium [C 8mim], 1-decyl-3-methylimidazolium [C10mim] tetrafluoroborates [BF4]. Concentration depth profiles of the elements in an ionic liquid (IL) homologous series with a common anion were obtained. We show that separation between the oppositely charged ions is seen for all three ionic liquids, resulting in an electrical double layer formation. The surface charge shifts from more positive to more negative with increasing aliphatic chain length.
|Number of pages||8|
|Journal||Physical Chemistry Chemical Physics|
|Publication status||Published - 14 Oct 2011|