Structures of Ionic Liquids Having Both Anionic and Cationic Octyl Tails

Lamellar Vacuum Interface vs Sponge-Like Bulk Order

Weththasinghage Don Amith, Jeevapani J. Hettige, Ed Castner, Claudio J. Margulis

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Numerous experimental and computational studies have shown that the structure of ionic liquids is significantly influenced by confinement and by interactions with interfaces. The nature of the interface can affect the immediate ordering of cations and anions, changing important rheological characteristics relevant to lubrication. Most studies suggest that such changes are local or short-ranged and that bulk properties are reestablished on a length scale of a few nanometers. The current study focuses on the 1-methyl-3-octylimidazolium octylsulfate ionic liquid for which both the cation and anion have moderate length linear alkyl tails. For this system, we find that the bulk phase is dominated by the very common sponge-like morphology characteristic of many ionic liquids. However, at the vacuum interface, a lamellar structure is observed that is not restricted to the vicinity of the surface but instead extends across the full 9 nm slab of our simulation. We suspect that in reality it could extend significantly beyond this.

Original languageEnglish
Pages (from-to)3785-3790
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume7
Issue number19
DOIs
Publication statusPublished - Oct 6 2016

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Ionic Liquids
Ionic liquids
Vacuum
vacuum
Anions
Cations
Negative ions
liquids
Positive ions
anions
cations
Lamellar structures
lubrication
Lubrication
slabs
simulation
interactions

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Structures of Ionic Liquids Having Both Anionic and Cationic Octyl Tails : Lamellar Vacuum Interface vs Sponge-Like Bulk Order. / Amith, Weththasinghage Don; Hettige, Jeevapani J.; Castner, Ed; Margulis, Claudio J.

In: Journal of Physical Chemistry Letters, Vol. 7, No. 19, 06.10.2016, p. 3785-3790.

Research output: Contribution to journalArticle

Amith, Weththasinghage Don ; Hettige, Jeevapani J. ; Castner, Ed ; Margulis, Claudio J. / Structures of Ionic Liquids Having Both Anionic and Cationic Octyl Tails : Lamellar Vacuum Interface vs Sponge-Like Bulk Order. In: Journal of Physical Chemistry Letters. 2016 ; Vol. 7, No. 19. pp. 3785-3790.
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