Effect of the aliphatic chain length on electrical double layer formation at the liquid/vacuum interface in the [Cnmim][BF4] ionic liquid series

Christiaan Ridings, Vera Lockett, Gunther Andersson

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)17177-17184
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume13
    Issue number38
    DOIs
    Publication statusPublished - 14 Oct 2011

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