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首页> 外文期刊>Advanced Functional Materials >Condensation Induced Delamination of Nanoscale Hydrophobic Films
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Condensation Induced Delamination of Nanoscale Hydrophobic Films

机译：凝聚诱导的纳米疏水膜的分层

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摘要

Vapor condensation is a crucial phenomenon governing the efficiency of many processes. In particular, dropwise condensation on hydrophobic thin films (approximate to 100 nm-thick) has the potential to achieve remarkable heat transfer. However, the lack of durability of these thin films has limited applications for a century. Although degradation due to steam condensation has been described as "blistering," no satisfactory insight exists capable of elucidating the driving force for film delamination. Here, it is shown that nanoscale pinholes in hydrophobic films are the source of blister formation. By creating artificial pinholes via nanoindentation on thin (30 to 500 nm-thick) fluorinated hydrophobic films, it is demostrated that water blisters can be initiated at the pinholes during condensation. It is experimentally demonstrated that vapor is transferred to the blister through the nanoscale pinhole, and the driving force for delamination is capillary pressure generated at the pinhole by the pinned liquid-vapor interface. The techniques and insights presented here will inform future work on polymeric thin film and enable their durable design for a variety of applications.
机译：蒸气冷凝是控制许多过程效率的关键现象。特别地，在疏水薄膜（大约100 nm厚）上的逐滴冷凝具有实现显着传热的潜力。然而，这些薄膜缺乏耐用性已经限制了一个世纪的应用。尽管由于蒸汽凝结引起的降解被描述为“起泡”，但尚无令人满意的见解能够阐明薄膜分层的驱动力。在这里，表明疏水膜中的纳米级针孔是水泡形成的来源。通过在氟化的疏水薄膜（厚度为30至500 nm）上通过纳米压痕形成人工针孔，可以证明在凝结过程中会在针孔处引发水泡。实验证明，蒸汽是通过纳米级针孔转移到泡罩中的，分层的驱动力是针状液-气界面在针孔处产生的毛细管压力。此处介绍的技术和见解将为聚合物薄膜的未来工作提供参考，并使其耐用的设计适用于各种应用。

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  • 来源
    《Advanced Functional Materials》 |2019年第43期|1905222.1-1905222.10|共10页
  • 作者

    Ma Jingcheng; Cha Hyeongyun; Kim Moon-Kyung; Cahill David C.; Miljkovic Nenad;

  • 作者单位

    Univ Illinois Dept Mech Sci & Engn Urbana IL 61801 USA;

    Univ Illinois Dept Mech Sci & Engn Urbana IL 61801 USA|Univ Illinois Mat Res Lab Urbana IL 61801 USA|Univ Illinois Dept Mat Sci & Engn Urbana IL 61801 USA;

    Univ Illinois Dept Mech Sci & Engn Urbana IL 61801 USA|Univ Illinois Mat Res Lab Urbana IL 61801 USA|Univ Illinois Dept Elect & Comp Engn Urbana IL 61801 USA|Kyushu Univ Int Inst Carbon Neutral Energy Res Nishi Ku 744 Motooka Fukuoka Fukuoka 8190395 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    blister; condensation; droplets; failure; hydrophobic;

    机译：水疱;缩合;飞沫;失败;疏水的;

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