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Updated: Jun 10, 2025
06:44
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
69.0K
Multiphase Coexistence in an Ionic Liquid: 1-Decyl-3-methylimidazolium Nitrate.
Hiroshi Abe1, Shusei Maruyama1, Hiroaki Kishimura1
1Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan.
The Journal of Physical Chemistry Letters
|October 16, 2024
Summary
Complex phase transitions in 1-decyl-3-methylimidazolium nitrate ([C10mim][NO3]) ionic liquids were revealed. Multiphase coexistence, including ionic liquid crystals, was observed and depended on cooling rates.
Area of Science:
- Materials Science
- Physical Chemistry
- Condensed Matter Physics
Background:
- Ionic liquids (ILs) exhibit complex phase behaviors.
- Understanding these transitions is crucial for their application in various fields.
- 1-decyl-3-methylimidazolium nitrate ([C10mim][NO3]) is a single-component ionic liquid with poorly understood phase transitions.
Purpose of the Study:
- To investigate the complicated phase transitions in [C10mim][NO3] ionic liquid.
- To elucidate the influence of cooling rates on phase transition dynamics.
- To identify the coexisting phases during these transitions.
Main Methods:
- Raman spectroscopy was employed to study the molecular vibrations.
- Synchrotron small- and wide-angle X-ray scattering (SWAXS) was used to probe structural changes.
- Time-resolved synchrotron SWAXS enabled the observation of transitions at different cooling rates.
Main Results:
- Complicated phase transitions were observed in [C10mim][NO3].
- Time-resolved SWAXS distinguished phase transitions based on cooling rate.
- Multiphase coexistence, including ionic liquid crystals (ILCs), hybrid-layered crystals, and hexagonal close-packed structures, occurred at cooling rates of 8-9 K/min.
- A reentrant phase transition of the ILC phase upon heating was observed.
Conclusions:
- The cooling rate significantly influences the phase transition behavior of [C10mim][NO3].
- Multiple crystalline and liquid crystalline phases can coexist in this ionic liquid.
- The study reveals a complex phase diagram with potential for reentrant phase transitions.
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