Concentration depth profiles of the elements in [C6mim]X (X=[BF4]- and [Cl]-) have been determined using neutral impact collision ion scattering spectroscopy in order to investigate how the choice of the anion influences the surface structure of the [C6mim]+ ionic liquids. The results show that the more polarisable, fluorinated anion [BF4]-, has a stronger tendency to adsorb to the surface compared to [Cl]-. While the [BF4]- intermingles with the cation aliphatic chains, the decreased surface propensity of the [Cl]- allows for the preferential orientation of the cation aliphatic chains pointing towards the vapour phase.
|Number of pages||5|
|Journal||Colloids and Surfaces A-Physicochemical and Engineering Aspects|
|Publication status||Published - 5 Nov 2012|
- Depth profile
- Ionic liquid
- Surface charge