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Spatial Control of Condensate Droplets on Superhydrophobic Surfaces

机译：超疏水表面上凝结水珠的空间控制

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摘要

Super-bi-philic surfaces have been fabricated and characterized using environmental scanning electron microscopy (ESEM) to demonstrate spatial control of microscale droplets during condensation. The surfaces are composed of biotemplated nickel nanostructures based on the self assembly and metalization of the Tobacco mosaic virus. They are then functionalized using vapor-phase deposition of trichlorosilane, and lithographically patterned to create engineered nucleation sites. The resulting surfaces are primarily superhydrophobic (θ ≈ 170°) with arrays of superhydrophilic islands (θ ≈ 0°) with diameters of 3 μm and center-to-center pitches varying from 10-50 μm. During condensation the superhydrophilic islands promote nucleation resulting in spatial control of the condensate, which forms into ordered rectangular arrays (a,b). This spatial control has been shown to produce efficient jumping-mode condensation for pitches greater than 15 μm, as well as promote multi-droplet events (c). Additionally, super-bi-philic surfaces have been shown to delay the transition to a flooded state at high supersaturations, as compared to superhydrophobic designs.
机译：已经使用环境扫描电子显微镜（ESEM）制作并表征了超双亲表面，以证明缩合过程中微滴的空间控制。这些表面由基于烟草花叶病毒的自组装和金属化的生物模板化镍纳米结构组成。然后使用三氯硅烷的气相沉积功能化它们，并进行光刻图案化以创建工程化的成核位点。产生的表面主要是超疏水性（θ≈170°），带有超亲水岛阵列（θ≈0°），直径为3μm，中心距为10-50μm。在冷凝过程中，超亲水岛促进了成核作用，从而导致了冷凝物的空间控制，形成了有序的矩形阵列（a，b）。事实证明，这种空间控制可在间距大于15μm的情况下产生有效的跳跃模式凝结，并促进多液滴事件（c）。此外，与超疏水设计相比，超双亲表面已显示出在高过饱和度时延迟了向淹没状态的过渡。

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  • 来源
    《Journal of Heat Transfer》 |2015年第8期|080905.1-080905.1|共1页
  • 作者

    Emre OElceroglu; Matthew McCarthy;

  • 作者单位

    Multiscale Thermofluidics Lab, Department of Mechanical Engineering Drexel University, Philadelphia, PA, USA;

    Multiscale Thermofluidics Lab, Department of Mechanical Engineering Drexel University, Philadelphia, PA, USA;

  • 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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