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Large-Scale Fabrication of Wettability-Controllable Coatings for Optimizing Condensate Transfer Ability
Langmuir ( IF 3.9 ) Pub Date : 2021-02-05 , DOI: 10.1021/acs.langmuir.0c03544
Shanlin Wang 1 , Xiaofeng Zhao 1, 2 , Yuancheng Teng 1 , Xintao Chen 1 , Rajeev Ahuja 2
Affiliation  

Systematic regulation of hydrophilic regions plays a key role in optimizing the heterogeneous hydrophilic-hydrophobic surface for promoting condensate transfer ability (CTA) under subcooling or high-humidity conditions. In this work, we develop an operable method to fabricate wettability-controllable coatings by regulating the mass ratio of superamphiphobic and superamphiphilic powder (MRP). By investigating the synergic relationship between CTA and MRP, we display an interesting competition between condensation and detachment of condensates. The initial dewing rate associated with reflecting phase change heat transfer capacity could be continuously strengthened by promoting MRP, while the detachment capacity with respect to improving the long-term condensing rate can be limited by the excessive superamphiphilic microregions. Based on this, we have optimized the threshold of MRP for promoting the condensation heat transfer ability and the water harvesting efficiency with the values of 10:0–8:2 and 10:0–4:6, respectively. This work provides important guidance in designing and optimizing heterogeneous hydrophilic-hydrophobic surfaces for multiple industrial applications including heat management, water harvesting, and desalination.

中文翻译:

大规模制造可润湿性可控涂层,以优化冷凝水传输能力

亲水性区域的系统调节在优化非均质亲水性-疏水性表面以促进过冷或高湿条件下的凝结水转移能力(CTA)方面起着关键作用。在这项工作中,我们开发了一种可操作的方法,通过调节超两亲和超两亲粉末(MRP)的质量比来制造可润湿性可控制的涂料。通过研究CTA和MRP之间的协同关系,我们展示了冷凝与冷凝物分离之间的有趣竞争。可以通过促进MRP来不断增强与反映相变传热能力相关的初始结露率,而提高长期冷凝率的分离能力可能会受到过多的超两亲性微区的限制。基于此,我们优化了MRP的阈值,以提高冷凝水的传热能力和集水效率,其值分别为10:0–8:2和10:0–4:6。这项工作为多种工业应用(包括热管理,集水和脱盐)的设计和优化非均质亲水-疏水表面提供了重要的指导。
更新日期:2021-02-23
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