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Issue 15, 2012
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Surface structure of a “non-amphiphilic” protic ionic liquid

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The nanostructure of the ethanolammonium nitrate (EtAN)–air surface has been investigated using X-ray reflectometry (XRR), vibrational sum frequency spectroscopy (VSFS) and neutral impact collision ion scattering spectroscopy (NICISS). The XRR data decays more rapidly than expected for a perfectly sharp interface, indicating a diffuse electron (scattering length) density profile. Modelling of the XRR data using three different fitting routines produced consistent interfacial profiles that suggest the formation of interfacial EtAN clusters. Consistent with this, VSFS reveals that the EtAN surface is predominantly covered by –CH2– moieties, with the –NH3+ and –OH groups of the cation buried slightly deeper in the interface. The elemental profiles determined using NICISS also show enrichment of carbon relative to nitrogen and oxygen in the outermost surface layer, which is consistent with the surface cation orientation deduced from VSFS, and with the presence of EtAN aggregates at the liquid surface.

Graphical abstract: Surface structure of a “non-amphiphilic” protic ionic liquid

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Publication details

The article was received on 22 Nov 2011, accepted on 22 Dec 2011 and first published on 22 Dec 2011

Article type: Paper
DOI: 10.1039/C2CP23694J
Citation: Phys. Chem. Chem. Phys., 2012,14, 5106-5114

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    Surface structure of a “non-amphiphilic” protic ionic liquid

    D. Wakeham, P. Niga, C. Ridings, G. Andersson, A. Nelson, G. G. Warr, S. Baldelli, M. W. Rutland and R. Atkin, Phys. Chem. Chem. Phys., 2012, 14, 5106
    DOI: 10.1039/C2CP23694J

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