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Amphiphilic Cyclodextrin-Based Liquid Crystals for Proton Conduction.

Pier-Luc Champagne, David Ester1, Danielle Polan

  • 1Department of Chemistry , Simon Fraser University , 8888 University Drive , Burnaby , British Columbia V5A 1S6 , Canada.

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|May 24, 2019
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Novel cyclodextrin-based materials form ordered liquid crystals for proton conduction. These eco-friendly amphiphilic poly(carboxylic acid)s show high conductivity, paving the way for new proton conductive materials.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Cyclodextrins (CDs) are versatile cyclic oligosaccharides with unique structural properties.
  • Protonic conductors are crucial for energy applications like fuel cells.
  • Developing new proton conductive materials from sustainable sources is a key research area.

Purpose of the Study:

  • To investigate novel cyclodextrin (CD)-based amphiphilic poly(carboxylic acid)s as protonic conductors.
  • To explore the self-assembly behavior and liquid crystalline properties of these new materials.
  • To evaluate the proton conductivity of these CD-based materials in solid states.

Main Methods:

  • Synthesis of amphiphilic poly(carboxylic acid)s using non-toxic cyclodextrins.
  • Characterization of self-assembly into highly ordered smectic liquid crystalline mesophases.
  • Measurement of proton conductivity under varying temperature and humidity conditions.

Main Results:

  • The synthesized materials self-assembled into well-defined smectic liquid crystalline mesophases.
  • Long-range 2D hydrogen-bond networks were formed within the mesophases.
  • Impressive solid-state proton conductivities up to 1.4 × 10-2 S cm-1 were achieved at 70 °C and 95% humidity.

Conclusions:

  • Amphiphilic cyclodextrin-based liquid crystals represent a novel class of proton conductive materials.
  • The unique structure and hydrogen-bonding networks contribute to high proton conductivity.
  • These eco-friendly materials offer a promising alternative for proton conductive applications.