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Issue 46, 2012
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Composition of the outermost layer and concentration depth profiles of ammonium nitrate ionic liquid surfaces

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Abstract

Differences in the surface structure of protic ionic liquids (ILs) with three different cations and a common anion; ethyl-, propyl- and 2-hydroxyethyl- (or ethanol-) ammonium nitrate (EAN, PAN and EtAN, respectively) have been observed by neutral impact collision ion scattering spectroscopy (NICISS) and metastable induced electron spectroscopy/ultraviolet photoelectron spectroscopy (MIES/UPS). NICISS is used to determine the concentration depth profiles of the elements in each IL and it reveals an enrichment of cation alkyl chains of PAN and EtAN in the outermost layer compared to EAN, and a corresponding depletion of nitrate from the outermost layer of the EtAN surface. MIES probes the molecular orbitals of only the species in the outermost layer of a sample and confirms that, while both the anion and the cation are present to some degree at the surface of all three ILs, the cation is enriched to a greater extent at the surface of PAN and EtAN compared to EAN.

Graphical abstract: Composition of the outermost layer and concentration depth profiles of ammonium nitrate ionic liquid surfaces

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Publication details

The article was received on 30 Aug 2012, accepted on 11 Oct 2012 and first published on 12 Oct 2012


Article type: Paper
DOI: 10.1039/C2CP43035E
Citation: Phys. Chem. Chem. Phys., 2012,14, 16088-16095
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    Composition of the outermost layer and concentration depth profiles of ammonium nitrate ionic liquid surfaces

    C. Ridings, G. G. Warr and G. G. Andersson, Phys. Chem. Chem. Phys., 2012, 14, 16088
    DOI: 10.1039/C2CP43035E

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