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How Nanostructures Affect Water Droplet Nucleation on Superhydrophobic Surfaces

机译：纳米结构如何影响超疏水表面上的水滴成核

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摘要

Nucleation is the first stage of phase change phenomena, including condensation on nanostructured superhydrophobic surfaces. Despite plenty of theoretical studies on the effect of nanostructure density and shape on water droplet nucleation, not many experimental investigations have been reported. Here, we show both experimentally and theoretically that a moderate increase in the nanostructure density can lead to an increase in the nucleation density of water droplets because of the decreased energy barrier of nucleation in cavities formed between the nanostructures. Specifically, we observed droplets aligned in regions with denser nanostructures. The number and average volume of the aligned droplets in these regions were larger than that of the droplets in the surrounding areas. However, nucleation in cavities subsequently caused initial pinning of the droplet base within the nanostructures, forming a balloonlike, slightly elongated droplet shape. The dewetting transition of the pinned droplets from the Wenzel state to the unpinned Cassie state was predicted by quantifying the aspect ratio of droplets ranging from 3 to 30 μm. Moreover, the coalescence-jumping of droplets was followed by a new cycle of droplet condensation in an aligned pattern in an emptied area. These findings offer guidelines for designing enhanced superhydrophobic surfaces for water and energy applications.
机译：成核是相变现象的第一阶段，包括在纳米结构超疏水表面上的凝结。尽管对纳米结构密度和形状对水滴成核的影响进行了大量的理论研究，但尚未进行许多实验研究的报道。在这里，我们在实验和理论上都显示出，由于纳米结构之间形成的空腔中成核的能垒降低，纳米结构密度的适度增加会导致水滴的成核密度增加。具体来说，我们观察到液滴在纳米结构密集的区域排列。这些区域中排列的液滴的数量和平均体积大于周围区域中的液滴的数量和平均体积。然而，腔中的成核随后引起液滴基础在纳米结构内的初始钉扎，形成了气球状的稍微伸长的液滴形状。通过量化液滴的纵横比（范围为3到30μm），可以预测固定液滴从Wenzel状态到未固定Cassie状态的去湿转变。而且，液滴的聚结跳跃之后是在排空区域中以对准模式的液滴凝结的新循环。这些发现为设计用于水和能源应用的增强型超疏水表面提供了指导。

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  • 来源
    《Journal of Heat Transfer》 |2017年第11期|112401.1-112401.10|共10页
  • 作者

    Aili Abulimiti; Ge Qiaoyu; Zhang Tiejun;

  • 作者单位

    Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, P.O Box 54224, Abu Dhabi, United Arab Emirates;

    Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, P.O Box 54224, Abu Dhabi, United Arab Emirates;

    Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, P.O Box 54224, Abu Dhabi, United Arab Emirates;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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