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Modulating the Conductivity of Light-Responsive Ionic Liquid Crystals.

Umama Bendaoud1, Pradip K Bhowmik2, Si L Chen2

  • 1Chemical Processes and Materials Research Group, Just Transition Lab, Centre for Energy Transition, School of Engineering, University of Aberdeen, King's College, Aberdeen AB24 3UE, UK.

Molecules (Basel, Switzerland)
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Summary
This summary is machine-generated.

New light-responsive ionic liquid crystals (ILCs) show tunable conductivity and dielectric properties. These smart materials offer potential for advanced energy storage and conversion applications.

Keywords:
azobenzenesenergy conversion and storageionic conductivityionic liquid crystalsphotoisomerisation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Soft Matter Physics

Background:

  • Ionic liquid crystals (ILCs) are promising materials for advanced applications due to their unique phase behavior and ionic conductivity.
  • Controllable electrolytes are crucial for developing next-generation energy storage and conversion devices.
  • Photoresponsive materials offer dynamic control over material properties through external stimuli like light.

Purpose of the Study:

  • To investigate the phase behavior, dielectric response, and conductivity of novel light-responsive ionic liquid crystals.
  • To explore the potential of these materials as controllable electrolytes for energy applications.
  • To understand the influence of photoisomerization on the properties of ionic liquid crystals.

Main Methods:

  • Synthesis and characterization of dicationic viologens (6BP18, EV2ON(Tf)2) and a photoresponsive mesogen (CNAzO14).
  • Preparation of mixtures of ILCs with varying molar percentages of CNAzO14.
  • Analysis of phase behavior using techniques like polarized optical microscopy and differential scanning calorimetry.
  • Measurement of dielectric response and direct current conductivity under varying conditions, including UV light irradiation.
  • Investigation of light-induced E-Z photoisomerization of azobenzene groups.

Main Results:

  • The synthesized mixtures exhibited liquid crystal behavior and light responsiveness.
  • Strong dielectric responses were observed in the studied ILCs.
  • The 5%-CNAzO14/Ev2ON(Tf)2 mixture showed conductivities in the 10^-7 S·cm^-1 range.
  • UV light irradiation (365 nm) led to a two-fold increase in conductivity.
  • The E-Z photoisomerization of azobenzene groups was confirmed as the mechanism for light responsiveness.

Conclusions:

  • Novel light-responsive ionic liquid crystals were successfully developed.
  • These materials demonstrate tunable conductivity and dielectric properties, making them suitable for controllable electrolytes.
  • The findings pave the way for designing smart ionic soft materials with light-tunable nanostructures for energy applications.