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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Adsorbed and near surface structure of ionic liquids at a solid interface.

Juan José Segura1, Aaron Elbourne, Erica J Wanless

  • 1Department of Materials Science and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.

Physical Chemistry Chemical Physics : PCCP
|January 31, 2013
PubMed
Summary

Atomic force microscopy revealed distinct self-assembly structures at solid-ionic liquid interfaces. Ethylammonium nitrate (EAN) forms the smallest imaged aggregates, while EMIm TFSI shows templated cation adsorption.

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Area of Science:

  • Surface Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Understanding solid-ionic liquid (IL) interfaces is crucial for applications in electrochemistry and materials science.
  • The bulk structure of ILs, whether protic or aprotic, can influence their interfacial organization.
  • Atomic force microscopy (AFM) offers high-resolution imaging capabilities for interfacial studies.

Purpose of the Study:

  • To characterize the lateral structure of ionic liquids (ILs) adsorbed onto solid surfaces using advanced AFM techniques.
  • To compare the interfacial behavior of a protic IL (ethylammonium nitrate, EAN) and an aprotic IL (1-ethyl-3-methylimidazolium bis(trifluoro-methylsulfonyl)imide, EMIm TFSI).
  • To elucidate the influence of bulk liquid morphology and IL class on surface organization.

Main Methods:

  • Employing soft contact and amplitude-modulation (AM) AFM imaging techniques.
  • Utilizing tip pressures optimized for the specific solid-IL interface.
  • Characterizing the adsorption of EAN and EMIm TFSI onto mica surfaces.

Main Results:

  • Ethylammonium nitrate (EAN) self-assembles into unique worm-like structures at the solid-liquid interface, representing the smallest imaged self-assembled aggregates.
  • 1-ethyl-3-methylimidazolium bis(trifluoro-methylsulfonyl)imide (EMIm TFSI) cations adsorb in a more isolated manner, arranged in rows templated by the mica surface.
  • Comparison highlights how the distinct bulk structures of EAN (nanostructured sponge phase) and EMIm TFSI (weak/absent bulk structure) dictate their interfacial organization.

Conclusions:

  • The study demonstrates that AFM can provide unprecedented clarity in characterizing solid-IL interfaces.
  • The strength of bulk liquid morphology significantly impacts the lateral organization at the interface.
  • Distinct self-assembly behaviors are observed for protic (EAN) and aprotic (EMIm TFSI) ILs at the solid-liquid interface.