Structure of the ethylammonium nitrate surface: An X-ray reflectivity and vibrational sum frequency spectroscopy study

Petru Niga, Deborah Wakeham, Andrew Nelson, Gregory G. Warr, Mark W. Rutland, Rob Atkin

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

X-ray reflectivity and vibrational sum frequency spectroscopy are used to probe the structure of the ethylammonium nitrate (EAN)-air interface. X-ray reflectivity reveals that the EAN-air interface is structured and consists of alternating nonpolar and charged layers that extend 31 Å into the bulk. Vibrational sum frequency spectroscopy reveals interfacial cations have their ethyl moieties oriented toward air, with the CH3 C3 xis positioned ∼36.5° from interface normal. This structure is invariant between. 1.5 and 51°C. On account of its molecular symmetry, the orientation of the nitrate anion cannot be determined with certainty.

Original languageEnglish
Pages (from-to)8282-8288
Number of pages7
JournalLangmuir
Volume26
Issue number11
DOIs
Publication statusPublished - 1 Jun 2010
Externally publishedYes

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