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Related Experiment Video

Updated: Nov 19, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Supramolecular gelation controlled by an iodine clock.

Solenn Riedel1, Thomas Schweizer2, Katrina Smith-Mannschott1

  • 1Laboratory of Soft and Living Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland. guidop@ethz.ch.

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Summary

Researchers controlled the gelation of a poly(vinyl alcohol)-iodine material using a clock reaction. This method allows tuning of the hydrogel

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Biomaterials Design

Background:

  • Programming supramolecular assembly in the time domain is crucial for creating advanced biomimetic materials.
  • Controlling material properties over time is a key challenge in supramolecular chemistry.

Purpose of the Study:

  • To achieve time-controlled sol-gel transitions in a poly(vinyl alcohol)-iodine supramolecular complex.
  • To demonstrate a method for programming material assembly in the time domain.

Main Methods:

  • Utilized a clock reaction to generate iodine in situ.
  • Formed a poly(vinyl alcohol)-iodine supramolecular complex.
  • Investigated tuning of gelation time and mechanical properties.

Main Results:

  • Successfully demonstrated time-controlled sol-gel transition of the poly(vinyl alcohol)-iodine complex.
  • Showed that gelation time can be precisely controlled by clock reaction parameters.
  • Confirmed that mechanical properties of the hydrogel are tunable.

Conclusions:

  • In situ iodine generation via clock reaction offers a robust method for programming supramolecular assembly in the time domain.
  • This approach provides a versatile platform for designing responsive and tunable biomimetic hydrogels.
  • Competitive iodine complexation offers an additional strategy for fine-tuning hydrogel properties.