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Supramolecular Hydrophobic Aggregates in Hydrogels Partially Inhibit Ice Formation.

Clinton G Wiener1, Madhusudan Tyagi2,3, Yun Liu2

  • 1Department of Polymer Engineering, University of Akron , Akron, Ohio 44325, United States.

The Journal of Physical Chemistry. B
|May 27, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed supramolecular hydrogels using dimethylacrylamide (DMA) and 2-(N-ethylperfluorooctane sulfonamido)ethyl acrylate (FOSA) copolymers. These hydrogels effectively inhibit ice crystallization, enabling highly supercooled water stability.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biophysics

Background:

  • Preventing ice crystallization is crucial for various applications and understanding water's low-temperature physics.
  • Antifreeze proteins offer a natural model for inhibiting ice formation through water confinement.

Purpose of the Study:

  • To develop a synthetic route for inhibiting ice crystallization in water using supramolecular hydrogels.
  • To investigate the effect of copolymer composition on water mobility and freezing suppression.

Main Methods:

  • Synthesis of supramolecular hydrogels from dimethylacrylamide (DMA) and 2-(N-ethylperfluorooctane sulfonamido)ethyl acrylate (FOSA) copolymers.
  • Dynamic and static neutron scattering to analyze water dynamics and structure within the hydrogels.
  • Varying copolymer composition to tune nanodomain spacing and water confinement.

Main Results:

  • Hydrogels with 22 mol % FOSA demonstrated partial inhibition of ice formation, with 45% of water remaining unfrozen at 205 K.
  • Water confinement (<2 nm) within hydrophobic nanodomains prevented crystallization.
  • Highly mobile amorphous water was observed at 220 K, with diffusivity only half that at 295 K.

Conclusions:

  • Supramolecular hydrogels can effectively stabilize highly supercooled water by inhibiting ice crystallization.
  • Copolymer composition is key to modulating nanodomain spacing and controlling water freezing.
  • This approach offers a promising strategy for applications requiring stable supercooled water.