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This study introduces a novel supramolecular gel that dynamically transforms between gel states, reversibly switching optical activity without dissolving. This biomimetic system offers programmable control over chirality and properties for advanced materials.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Biomimetic systems

Background:

  • Collagen exhibits remarkable adaptability.
  • Controlling chirality in soft materials is challenging.
  • Dynamic supramolecular assemblies require stable transformations.

Purpose of the Study:

  • To develop a supramolecular gel with dynamic gel-to-gel transformations.
  • To achieve reversible optical activity inversion without sol phase.
  • To create a biomimetic system inspired by collagen.

Main Methods:

  • Utilized 4-pyridinylboronic acid and guanosine as building blocks.
  • Employed pH-responsive boronic ester formation and G-quadruplex stacking for hierarchical assembly.
  • Implemented bidirectional and monotonic pH modulation for control.

Main Results:

  • Achieved dynamic gel-to-gel transformations and reversible optical activity switching.
  • Demonstrated programmable control over chirality, morphology, and mechanical properties.
  • Maintained macroscopic stability during transformations, avoiding sol phase.

Conclusions:

  • Developed a stable, out-of-equilibrium hydrogel system with controlled optical activity switching.
  • Bridged the gap between static assemblies and dynamic soft materials.
  • The system is suitable for adaptive optics, responsive biomaterials, and programmable soft matter.