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Pressing matter: why are ionic liquids so viscous?

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|March 28, 2022
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This summary is machine-generated.

High viscosity in room temperature ionic liquids hinders applications. This study compared ionic liquids with molecular mimics, revealing that both coulombic compaction and charge network interactions significantly impact viscosity, suggesting a dual approach for optimization.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Room temperature ionic liquids (RTILs) show promise for applications like batteries.
  • High viscosity is a major limitation hindering widespread RTIL adoption.
  • Current understanding of RTIL viscosity involves competing molecular/local versus collective/long-range mechanisms.

Purpose of the Study:

  • To elucidate the dominant mechanisms governing viscosity in RTILs.
  • To differentiate between molecular and collective contributions to viscosity.
  • To guide strategies for viscosity reduction in RTILs.

Main Methods:

  • Comparison of an RTIL with an uncharged, isoelectronic, isostructural molecular mimic.
  • High-pressure viscosity measurements of the molecular mimic to simulate RTIL densities.
  • Analysis of contributions from coulombic compaction and charge network interactions.

Main Results:

  • Viscosity of the molecular mimic was measured under high pressure.
  • Coulombic compaction and charge network interactions were found to be of similar magnitude in influencing viscosity.
  • The study provides empirical evidence to distinguish between viscosity hypotheses.

Conclusions:

  • Viscosity in RTILs is influenced by both coulombic compaction and charge network effects.
  • Optimizing RTIL viscosity requires a dual approach addressing both identified mechanisms.
  • Findings contribute to understanding and designing RTILs with reduced viscosity.