Zhenda Liu, Dagui Wang, Wei Zhang, Shan Gao, Yang Shen, Zhenxu Shi, Binyang Lu, Dehui Wang, Xu Deng
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引用次数: 0
摘要
在防污、减少阻力和传热等领域,材料表面保持对液体的超排斥性至关重要。超疏水性表面提供了一种有效的方法,但受相变引起的润湿转换的影响,阻碍了其实际应用。在这项工作中,通过将亲水性互连表面框架与超疏水纳米结构相结合,设计出了双亲铠装超疏水表面(BASS)。亲水性框架顶部为冷凝液滴的成核提供了空间选择性,而超疏水纳米结构则使冷凝液滴保持干燥。冷凝液滴在 BASS 上的进一步生长、凝聚、跳跃和滚落显示出对相变引起的润湿转变的显著抵抗力。在 100 °C 的蒸汽中暴露 240 小时后,它仍能保持稳定的超疏水性能,比传统的超疏水表面至少提高了两个数量级。这种设计的 BASS 为解决相变诱导的润湿转变提供了一种有效的方法,从而扩大了超疏水表面在冷凝传热、防污和流体输送等领域的实际应用。
Long-Term Resistance to Phase Change-Induced Wetting Transition on Biphilic Armored Superhydrophobic Surfaces
Material surfaces maintaining a liquid super-repellent is crucial in fields such as anti-fouling, drag reduction, and heat transfer. Superhydrophobic surfaces provide an effective approach but suffer from phase change-induced wetting transitions, hindering their practical applications. In this work, Biphilic armored superhydrophobic surfaces (BASS) are designed by integrating hydrophilic interconnected surface frames with superhydrophobic nanostructures. The hydrophilic top of the frame provides spatial selectivity for condensate droplet nucleation, and superhydrophobic nanostructures enable staying dry. Further growth, coalescence, jumping, and roll-off of the condensate droplets on BASS, show remarkable resistance to phase change-induced wetting transition. It still maintains stable superhydrophobicity when exposed to 100 °C of steam for 240 h, at least two orders of magnitude improvement over traditional superhydrophobic surfaces. Such a designing BASS provides an effective approach to address the phase change-induced wetting transition, thereby extending the practical application in the fields of condensation heat transfer, anti-fouling, and fluid transportation of superhydrophobic surfaces.
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology.
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