Super-enhanced evaporation of droplets from porous coatings
Super-enhanced evaporation of droplets from porous coatings
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DOI：
10.1016/j.jcis.2022.11.065
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发表时间：
2022-11-25
影响因子：
9.9
通讯作者：
Ducker, William A.
中科院分区：
文献类型：
--
作者：
Hosseini, Mohsen;Rodriguez, Alejandro;Ducker, William A.
假设：在不可渗透的固体上添加一层薄的、亲水的、多孔的涂层将导致撞击固体的液滴更快地蒸发。液滴会快速吸收，但垂直于界面的进展将受到涂层厚度的限制，因此液体将横向扩散到宽阔的圆盘中，从而暴露出大的液-汽界面以进行蒸发。实验：将体积为 2.5-25 lL 的液滴置于固体上，然后随时间监测每个液滴的质量和面积。我们将光滑、不渗透的亲水玻璃的数据与涂有由玻璃珠制成的薄（35-109 lm）多孔亲水玻璃层的相同玻璃进行了比较。结果：液滴在几秒钟之内就被吸收（吸入）到涂层中，并且液体横向扩散形成薄而宽的圆盘。重要的是，薄涂层上的液滴蒸发增强了 7-8 倍。蒸发速率与涂层厚度的倒数不成正比。增强固体上小液滴蒸发的能力可能具有实际应用，例如加速微生物的死亡。 (c) 2022 Elsevier Inc. 保留所有权利。
Hypothesis: The addition of a thin, hydrophilic, porous, coating to an impermeable solid will lead to more rapid evaporation of liquid droplets that impinge on the solid. The droplet will imbibe quickly, but the progress normal to the interface will be limited to the thickness of the coating, and therefore the liquid will spread laterally into a broad disk to expose a large liquid-vapor interface for evaporation. Experiments: Liquid droplets of volume 2.5-25 lL were placed on solids and then both the mass and area of each droplet were monitored over time. We compared data for smooth, impermeable hydrophilic glass to the same glass that was coated in thin (35-109 lm) porous, hydrophilic-glass layer fabricated from glass beads. Findings: The droplet was imbibed (wicked) into the coating within seconds, and the liquid spread later-ally to form a thin, broad, disk. Critically, evaporation of a droplet was enhanced by a factor of 7-8 on the thin coating. The evaporation rate was not proportional to the reciprocal thickness of the coating. The ability to enhance evaporation of small droplets on a solid may have practical applications, for example, in speeding the death of microbes. (c) 2022 Elsevier Inc. All rights reserved.