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Nanopore-Enhanced Drop Evaporation: When Cooler or More Saline Water Droplets Evaporate Faster.
ACS Nano ( IF 15.8 ) Pub Date : 2020-01-13 , DOI: 10.1021/acsnano.9b06618 Rocio Gimenez 1 , Galo J A A Soler-Illia 2 , Claudio Luis Alberto Berli 3 , Martín Gonzalo Bellino 1
ACS Nano ( IF 15.8 ) Pub Date : 2020-01-13 , DOI: 10.1021/acsnano.9b06618 Rocio Gimenez 1 , Galo J A A Soler-Illia 2 , Claudio Luis Alberto Berli 3 , Martín Gonzalo Bellino 1
Affiliation
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The evaporation of water droplets on surfaces is a ubiquitous phenomenon in nature and has critical importance in a broad range of technical applications. Here, we show a substantial enhancement of liquid evaporation rate when droplets are on nanoporous thin film surfaces. We also reveal how this nanopore-enhanced evaporation leads to counterintuitive phenomena: cooler or more saline water droplets evaporate faster. We find indeed that, contrary to typical evaporation behavior of sessile droplets on nonporous surfaces, the droplets placed on nanoporous thin films evaporate more rapidly when salt concentration increases or when the temperature decreases. This peculiar droplet evaporation behavior is related to the key role of the steady wetted annulus that is self-generated into the nanopore network in the drop periphery, which leads to an effectively enhanced evaporation area that controls the overall evaporation process. Our results provide the prospect of conceiving fresh scenarios in the evaporation of drops on surfaces in both relevant applications and fundamental insights.
中文翻译：
纳米孔增强的液滴蒸发：当凉爽或更多的盐水蒸发更快时。
表面上的水滴蒸发本质上是普遍存在的现象，并且在广泛的技术应用中具有至关重要的意义。在这里，当液滴在纳米多孔薄膜表面上时，我们显示出液体蒸发速率的显着提高。我们还揭示了这种纳米孔增强的蒸发如何导致反直觉的现象：较冷或更多的盐水水滴蒸发得更快。我们确实发现，与无孔液滴在无孔表面上的典型蒸发行为相反，当盐浓度增加或温度降低时，置于纳米多孔薄膜上的液滴蒸发得更快。这种独特的液滴蒸发行为与稳定湿润的环的关键作用有关，该环在液滴外围自生成纳米孔网络，从而有效地增加了蒸发面积，从而控制了整个蒸发过程。我们的结果提供了在相关应用和基本见识中设想液滴表面蒸发的新方案的前景。
更新日期：2020-01-13
中文翻译：
纳米孔增强的液滴蒸发：当凉爽或更多的盐水蒸发更快时。
表面上的水滴蒸发本质上是普遍存在的现象，并且在广泛的技术应用中具有至关重要的意义。在这里，当液滴在纳米多孔薄膜表面上时，我们显示出液体蒸发速率的显着提高。我们还揭示了这种纳米孔增强的蒸发如何导致反直觉的现象：较冷或更多的盐水水滴蒸发得更快。我们确实发现，与无孔液滴在无孔表面上的典型蒸发行为相反，当盐浓度增加或温度降低时，置于纳米多孔薄膜上的液滴蒸发得更快。这种独特的液滴蒸发行为与稳定湿润的环的关键作用有关，该环在液滴外围自生成纳米孔网络，从而有效地增加了蒸发面积，从而控制了整个蒸发过程。我们的结果提供了在相关应用和基本见识中设想液滴表面蒸发的新方案的前景。
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