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Updated: Jan 19, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Percolation Phase Transition from Ionic Liquids to Ionic Liquid Crystals.

Shen Li1,2, Yanting Wang3,4

  • 1CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 55 East Zhongguancun Road, P. O. Box 2735, Beijing, 100190, China.

Scientific Reports
|September 13, 2019
PubMed
Summary
This summary is machine-generated.

Percolation theory reveals the nanoscale segregated liquid to ionic liquid crystal transition in complex fluids. This study shows the transformation is a critical phenomenon driven by side-chain self-assembly.

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Area of Science:

  • Materials Science
  • Chemical Physics
  • Computational Chemistry

Background:

  • Complex fluids exhibit phase behaviors difficult to analyze with traditional methods.
  • Ionic liquids (ILs) are complex fluids with unique phase transitions, including nanoscale segregated liquid (NSL) and ionic liquid crystal (ILC) states.
  • The microscopic mechanism driving the NSL to ILC transformation in ILs remains poorly understood.

Purpose of the Study:

  • To investigate the microscopic mechanism of the phase transition from the nanoscale segregated liquid (NSL) to the ionic liquid crystal (ILC) state in ionic liquids.
  • To apply percolation phase transition theory to understand the transformation in complex fluids.
  • To elucidate the role of cationic side-chain length in driving this phase change.

Main Methods:

  • Coarse-grained molecular dynamics simulations were employed to model ionic liquid systems.
  • Analysis focused on the degree of connection and self-assembly of non-polar domains formed by side chains.
  • Percolation theory was used to identify critical phenomena during phase transitions.

Main Results:

  • Increasing cationic side-chain length promotes the formation of local non-polar domains within the NSL phase.
  • An abrupt percolation phase transition occurs, marking the system's transformation into the ILC phase.
  • The NSL to ILC transition was identified as a critical phenomenon.

Conclusions:

  • The transformation from NSL to ILC in ionic liquids is a critical phenomenon governed by percolation.
  • Side-chain self-assembly and domain connectivity are key factors in this phase transition.
  • Percolation theory provides a valuable framework for understanding phase transitions in complex fluids like ionic liquids.