Delaying Ice and Frost Formation Using Phase‐Switching Liquids
Résumé
Preventing water droplets from transitioning to ice is highly advantageous for numerous applications. Herein, we demonstrate that droplets condensing on certain highly supercooled phase change materials, referred to as thermo-responsive liquids (TRL) can exhibit freezing delay lasting up to 10-300 orders of magnitude longer than superhydrophobic surfaces under identical environmental conditions. The delayed freezing of droplets is primarily a consequence of the trapped heat release in their vicinity due to condensation, but is also affected by the morphology of solidified TRL surface and its miscibility in water. Regardless of the surface chemistry, TRL infused textured surfaces can show very low droplet adhesion when operated at temperatures below the corresponding melting point of the TRLs, thus engendering icephobicity even on hydrophilic surfaces. Beyond anti-icing, such materials can potentially be used in diverse industrial applications such as drag-reduction and condensation enhancement.
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