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Dynamics of ionic liquids under confinement in disordered mesopores
Julian Oberdisse1, Johan G Alauzun2, Shilpa Sharma2
1Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS 34095 Montpellier France anne-caroline.genix@umontpellier.fr.
Nanoscale Advances
|July 28, 2026
Summary
Confinement of ionic liquids in mesoporous silica alters phase transitions, suppressing crystallization and increasing conductivity. This study reveals how nanoconfinement controls ionic liquid behavior and charge transport.
Area of Science:
- Materials Science
- Physical Chemistry
- Nanotechnology
Background:
- Ionic liquids exhibit unique properties influenced by molecular dynamics and phase transitions.
- Understanding ionic liquid behavior within confined environments is crucial for advanced material applications.
- Mesoporous structures offer controlled environments for studying confinement effects on ionic liquids.
Purpose of the Study:
- To investigate the molecular dynamics and phase transitions of ionic liquids confined in mesoporous silica.
- To construct an effective phase diagram of ionic liquids under nanoconfinement.
- To explore the correlation between confinement, structural dynamics, and ionic conductivity.
Main Methods:
- Wide-angle X-ray scattering (WAXS) for structural analysis.
- Temperature-modulated differential scanning calorimetry (TMDSC) for thermal properties.
- Broadband dielectric spectroscopy (BDS) for molecular dynamics and conductivity.
Main Results:
- Nanoconfinement shifts crystallization temperatures and suppresses crystallization under strong confinement.
- Suppressed crystallization leads to significantly higher ionic conductivity within a specific temperature range.
- Confinement slows down structural dynamics and increases the glass transition temperature (Tg).
Conclusions:
- Confinement in mesoporous structures fundamentally alters ionic liquid phase behavior and charge transport.
- The study demonstrates a method to control ionic conductivity by manipulating confinement.
- Findings provide insights for designing materials with tailored ionic transport properties.
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