Journal
LANGMUIR
Volume 26, Issue 11, Pages 8282-8288Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la904697g
Keywords
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Funding
- European Union [321018, 607307]
- Swedish Research Council
- AINSE Ltd. [AINGRA08128]
- Australian Research Council [DP0986194, LX0776612]
- University of Newcastle
- Australian Research Council [LX0776612] Funding Source: Australian Research Council
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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 angstrom into the bulk. Vibrational sum frequency spectroscopy reveals interfacial cations have their ethyl moieties oriented toward air, with the CH3C3 axis positioned similar to 36.5 degrees from interface normal. This structure is invariant between 15 and 51 degrees C. On account of its molecular symmetry, the orientation of the nitrate anion cannot be determined with certainty.
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