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Mesoscopic Correlation Functions in Heterogeneous Ionic Liquids.

Henning Weiss1, Julian Mars1,2, Hailong Li1

  • 1Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.

The Journal of Physical Chemistry. B
|December 22, 2016
PubMed
Summary
This summary is machine-generated.

Ionic liquids with long side chains exhibit nanometer-scale structural heterogeneities due to aliphatic clustering. This study reveals these structures depend on alkyl chain length, anion geometry, and entropy, enabling predictions from bulk properties.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Ionic liquids (ILs) with long aliphatic side chains commonly display structural heterogeneities on the nanometer scale.
  • This microphase separation originates from the aggregation of aliphatic chains within the IL structure.

Purpose of the Study:

  • To investigate the temperature dependence of the liquid bulk structure in specific methylimidazolium-based ionic liquids.
  • To quantitatively analyze the relationship between structural heterogeneities and factors like alkyl chain length, anion geometry, and entropic effects.

Main Methods:

  • Small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) were employed to study the bulk structure.
  • A generalized Teubner-Strey model was used for quantitative analysis of the experimental data.

Main Results:

  • The study analyzed ionic liquids with varying alkyl chain lengths ([C18C1im]+, [C22C1im]+) and different anions ([FAP]-, [NTf2]-, [NNf2]-).
  • Periodicity (d) and correlation length (ξ) of structural heterogeneities were determined.
  • Results indicate that nanostructure formation is governed by the interplay of alkyl chain length, anion geometry, and entropic contributions.

Conclusions:

  • The mesoscopic structure of these ionic liquids is significantly influenced by molecular-level features.
  • A correlation was established between mesoscopic structure, density, and entropy of fusion, drawing comparisons with alcohols.
  • The findings enable predictions of mesoscopic structural behavior based on macroscopic properties of ionic liquids.