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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Ion structure controls ionic liquid near-surface and interfacial nanostructure.

Aaron Elbourne1, Kislon Voïtchovsky2, Gregory G Warr3

  • 1Discipline of Chemistry , University of Newcastle , NSW 2308 , Callaghan , Australia .

Chemical Science
|September 23, 2017
PubMed
Summary
This summary is machine-generated.

Ionic liquids exhibit unique nanostructures at surfaces, revealed by atomic force microscopy. This study details distinct interfacial and near-surface structures, offering insights for designing advanced ionic liquids.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Ionic liquids (ILs) possess inherent nanostructure, with distinct polar and apolar domains.
  • Surface interactions break the bulk isotropic symmetry of ILs, leading to unique interfacial nanostructures.
  • Previous studies on IL interfacial nanostructure were indirect.

Purpose of the Study:

  • To directly resolve the 3D nanostructure of protic ionic liquids (PILs) at and near the mica surface.
  • To investigate the influence of ion structure on interfacial and near-surface nanostructure.
  • To provide a foundation for the rational design of ILs for specific applications.

Main Methods:

  • In situ amplitude modulated atomic force microscopy (AM-AFM) was employed.
  • The study focused on five different protic ionic liquids.
  • Mica served as the substrate to observe ILs at and near the surface.

Main Results:

  • Distinct and well-defined surface and near-surface nanostructures were observed, differing from prior models.
  • Interfacial nanostructure is dictated by cation registry with mica surface charge sites.
  • Near-surface nanostructure is influenced by both cation and anion characteristics.

Conclusions:

  • The study provides direct visualization of IL nanostructure at interfaces.
  • Tuning IL interfacial nanostructure is achievable through control of ion structure.
  • Findings inform the optimization of ILs for applications in catalysis, lubrication, and electrochemistry.