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Surface structure of a "non-amphiphilic" protic ionic liquid
Centre for Organic Electronics, University of Newcastle, Callaghan, NSW 2308, Australia.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. KTH Royal Inst Technol, Dept Chem Surface & Corros Sci, SE-10044 Stockholm, Sweden.
Centre for Nano Scale Science and Technology, Flinders University, SA 5001, Australia.
Centre for Nano Scale Science and Technology, Flinders University, SA 5001, Australia.
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2012 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 14, no 5, 5106-5114 p.Article in journal (Refereed) Published
Abstract [en]

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 -CH 2- moieties, with the -NH 3 + 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. © 2012 the Owner Societies.

Place, publisher, year, edition, pages
2012. Vol. 14, no 5, 5106-5114 p.
Keyword [en]
Air; Ionic Liquids; Nanostructures; Nitrates; Surface Properties
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:miun:diva-16730DOI: 10.1039/c2cp23694jISI: 000301957900010Scopus ID: 2-s2.0-84858982947OAI: oai:DiVA.org:miun-16730DiVA: diva2:545780
Available from: 2012-08-21 Created: 2012-08-17 Last updated: 2015-03-23Bibliographically approved

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CiteExportLink to record
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