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Surface Ordering in Binary Mixtures of Protic Ionic Liquids.

Christiaan Ridings1, Gregory G Warr2, Gunther G Andersson1

  • 1Centre for NanoScale Science and Technology, Flinders University , Adelaide, SA 5001, Australia.

The Journal of Physical Chemistry Letters
|August 22, 2017
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Summary
This summary is machine-generated.

Binary mixtures of ethylammonium nitrate and propylammonium nitrate exhibit surface phase separation. This finding, revealed by surface tension and metastable induced electron spectroscopy, clarifies the outermost layer composition of these protic ionic liquids.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Protic ionic liquids (PILs) are salts that are liquid at ambient temperatures and contain transferable protons.
  • Understanding the surface behavior of PIL mixtures is crucial for their application in various fields.
  • Binary mixtures of ethylammonium nitrate and propylammonium nitrate are model systems for studying PIL surface properties.

Purpose of the Study:

  • To investigate the surface composition of binary mixtures of ethylammonium nitrate and propylammonium nitrate.
  • To determine the surface fraction of each component in the mixture.
  • To correlate surface properties with bulk composition.

Main Methods:

  • Surface tension measurements to quantify interfacial properties.
  • Metastable induced electron spectroscopy (MIES) for highly surface-sensitive analysis of the outermost molecular layer.
  • Analysis of the relationship between surface fraction and surface tension.

Main Results:

  • MIES confirmed its sensitivity to the outermost surface layer, enabling accurate determination of surface composition.
  • A piecewise linear relationship was observed between the surface fraction of components and the measured surface tension.
  • This relationship indicates distinct phase behavior within the surface layer of the PIL mixtures.

Conclusions:

  • The surface layer of ethylammonium nitrate and propylammonium nitrate mixtures undergoes phase separation.
  • The observed surface behavior can be explained by specific interactions and molecular arrangements at the interface.
  • This study provides fundamental insights into the surface thermodynamics of protic ionic liquid mixtures.