Using Frost to Promote Cassie Ice on Hydrophilic Pillars,Physical Review Letters

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Using Frost to Promote Cassie Ice on Hydrophilic Pillars
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-22 , DOI: 10.1103/physrevlett.127.044501
Hyunggon Park ₁ , S Farzad Ahmadi _{2,

3} , Jonathan B Boreyko ₂

Affiliation

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.

中文翻译：

使用 Frost 促进亲水柱上的 Cassie 冰

我们开发了一种新方法，无需任何易碎的疏水涂层或纳米结构即可将冰悬浮在捕获空气的 Cassie 状态。首先，由于亲水性铝柱的尖角和高度超过不可冷凝的气体屏障，霜优先生长在它们的顶部。随后，由于撞击的水滴被上部的霜尖阻止，形成了卡西冰。比例模型显示，撞击水滴的动态压力导致水在多孔霜中芯吸的速度比在柱子之间刺穿的时间尺度更快。

更新日期：2021-07-22

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