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Area of Science:

  • Materials Science
  • Nanotechnology
  • Supramolecular Chemistry

Background:

  • Ionic liquids (ILs) offer unique properties for material synthesis.
  • Carbon quantum dots (CQDs) are versatile nanomaterials with tunable fluorescence.
  • Controlling the amphiphilicity of CQDs is crucial for their application in gels.

Purpose of the Study:

  • To develop a strategy for preparing adjustable imidazolium-type IL-based CQDs.
  • To investigate the influence of chemical structure on CQD amphiphilicity.
  • To explore the application of CQDs with tunable amphiphilicity in stimuli-responsive gels.

Main Methods:

  • Systematic investigation of N-substitution chain length and anion type on CQD amphiphilicity.
  • Preparation of hydrophilic and hydrophobic CQDs.
  • Fabrication of fluorescent hydrogels and organogels using tailored CQDs.
  • Evaluation of light- and force-dual stimuli responsiveness of the prepared gels.

Main Results:

  • CQD hydrophobicity increased with N-substitution carbon chain length.
  • Amphiphilicity was switched by altering anion hydrophilicity/hydrophobicity.
  • Hydrophilic CQDs formed fluorescent hydrogels; hydrophobic CQDs formed organogels.
  • CQD-doped gels exhibited dual light- and force-stimuli responsiveness.

Conclusions:

  • Adjustable amphiphilicity of IL-based CQDs was achieved through structural modification.
  • Tunable CQDs enable the formation of distinct gel phases (hydrogels and organogels).
  • Dual stimuli-responsive fluorescent gels offer enhanced security for information encryption applications.