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Single Condensation Droplet Self-Ejection from Divergent Structures with Uniform Wettability
ACS Nano ( IF 15.8 ) Pub Date : 2024-02-28 , DOI: 10.1021/acsnano.3c05981 Nicolò Giuseppe Di Novo 1, 2 , Alvise Bagolini 2 , Nicola Maria Pugno 1, 3
ACS Nano ( IF 15.8 ) Pub Date : 2024-02-28 , DOI: 10.1021/acsnano.3c05981 Nicolò Giuseppe Di Novo 1, 2 , Alvise Bagolini 2 , Nicola Maria Pugno 1, 3
Affiliation
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Coalescence-induced condensation droplet jumping has been extensively studied for anti-icing, condensation heat transfer, water harvesting, and self-cleaning. Another phenomenon that is gaining attention for potential enhancements is the self-ejection of individual droplets. However, the mechanism underlying this process remains elusive due to cases in which the abrupt detachment of an interface establishes an initial Laplace pressure difference. In this study, we investigate the self-ejection of individual droplets from uniformly hydrophobic microstructures with divergent geometries. We design, fabricate, and test arrays of truncated, nanostructured, and hydrophobic microcones arranged in a square pattern. High-speed microscopy reveals the dynamics of a single condensation droplet between four cones: after cycles of growth and stopped self-propulsion, the suspended droplet self-ejects without abrupt detachments. Through analytical modeling of the droplet in a conical pore as an approximation, we describe the slow isopressure growth phases and the rapid transients driven by surface energy release once a dynamic configuration is reached. Microcones with uniform wettability, in addition to being easier to fabricate, have the potential to enable the self-ejection of all nucleated droplets with a designed size, promising significant improvements in the aforementioned applications and others.
中文翻译：
具有均匀润湿性的发散结构的单凝聚液滴自喷射
聚结引起的凝结液滴跳跃已被广泛研究用于防冰、凝结传热、集水和自清洁。另一个因潜在增强而受到关注的现象是单个液滴的自喷射。然而，由于界面的突然分离建立了初始拉普拉斯压力差，因此该过程背后的机制仍然难以捉摸。在这项研究中，我们研究了具有不同几何形状的均匀疏水微结构中单个液滴的自喷射。我们设计、制造和测试以方形图案排列的截短、纳米结构和疏水性微锥阵列。高速显微镜揭示了四个锥体之间单个冷凝液滴的动力学：在生长循环和停止自推进之后，悬浮的液滴会自行喷射而不会突然脱离。通过对圆锥孔中液滴的分析建模作为近似，我们描述了一旦达到动态构型，缓慢的等压生长阶段和由表面能释放驱动的快速瞬态。具有均匀润湿性的微锥除了更容易制造之外，还有可能实现所有具有设计尺寸的成核液滴的自喷射，从而有望在上述应用和其他应用中得到显着改进。
更新日期：2024-02-28
中文翻译：
具有均匀润湿性的发散结构的单凝聚液滴自喷射
聚结引起的凝结液滴跳跃已被广泛研究用于防冰、凝结传热、集水和自清洁。另一个因潜在增强而受到关注的现象是单个液滴的自喷射。然而，由于界面的突然分离建立了初始拉普拉斯压力差，因此该过程背后的机制仍然难以捉摸。在这项研究中，我们研究了具有不同几何形状的均匀疏水微结构中单个液滴的自喷射。我们设计、制造和测试以方形图案排列的截短、纳米结构和疏水性微锥阵列。高速显微镜揭示了四个锥体之间单个冷凝液滴的动力学：在生长循环和停止自推进之后，悬浮的液滴会自行喷射而不会突然脱离。通过对圆锥孔中液滴的分析建模作为近似，我们描述了一旦达到动态构型，缓慢的等压生长阶段和由表面能释放驱动的快速瞬态。具有均匀润湿性的微锥除了更容易制造之外，还有可能实现所有具有设计尺寸的成核液滴的自喷射，从而有望在上述应用和其他应用中得到显着改进。
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