Using Frost to Promote Cassie Ice on Hydrophilic Pillars.
| Autor: | Park H; Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, USA., Ahmadi SF; Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA.; Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, USA., Boreyko JB; Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2021 Jul 23; Vol. 127 (4), pp. 044501. |
| DOI: | 10.1103/PhysRevLett.127.044501 |
| Abstrakt: | We develop a novel approach to suspend ice in the air-trapping Cassie state without requiring any fragile hydrophobic coatings or nanostructures. First, frost was preferentially grown on the tops of hydrophilic aluminum pillars due to their sharp corners and elevation over the noncondensable gas barrier. Subsequently, Cassie ice was formed by virtue of the impacting droplets getting arrested by the upper frost tips. A scaling model reveals that the dynamic pressure of an impacting droplet causes the water to wick inside the porous frost faster than the timescale to impale between the pillars. |
| Databáze: | MEDLINE |
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