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Updated: Apr 17, 2026

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Self-assembled switching gels with multiresponsivity and chirality.

Wenrong Zhao1, Dong Wang, Hongsheng Lu

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Summary

Researchers developed a novel multiresponsive hydrogel from achiral molecules. This pH- and photo-responsive material exhibits tunable supramolecular chirality, paving the way for advanced functional materials.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Development of responsive materials is crucial for advanced applications.
  • Achiral molecules can exhibit supramolecular chirality through self-assembly.
  • Stimuli-responsive hydrogels offer tunable properties.

Purpose of the Study:

  • To construct a multiresponsive hydrogel material.
  • To investigate acid-induced gelation and supramolecular chirality.
  • To explore photoresponsive switching behavior.

Main Methods:

  • Synthesis of a hydrogel from a cationic surfactant and an azobenzene derivative.
  • Characterization using cryogenic transmission electron microscopy (cryo-TEM).
  • Rheological measurements, circular dichroism (CD), and (1)H NMR spectroscopy.

Main Results:

  • Successful construction of a multiresponsive hydrogel.
  • Demonstration of pH-induced gelation and supramolecular chirality.
  • Observation of reversible photoresponsive switching of microstructure and chirality.

Conclusions:

  • A mechanism for intermolecular H-bond-directed gelation and supramolecular chirality was proposed.
  • A chiroptical switch with four states, responsive to pH and light, was constructed.
  • The system offers insights into gelation-induced supramolecular chirality and new strategies for functional materials.