使用高分辨率显微镜探测分层表面的液-固和汽-液-固界面,Langmuir

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使用高分辨率显微镜探测分层表面的液-固和汽-液-固界面
Langmuir ( IF 3.7 ) Pub Date : 2018-02-28 00:00:00 , DOI: 10.1021/acs.langmuir.8b00298
Katherine T. Flynn Bolte , Rajesh Prabhu Balaraman , Kexin Jiao , Michael Tustison , Kiah S. Kirkwood , Chuanhong Zhou , Punit Kohli _{1,

2}

Affiliation

液-固（LS）和汽-液-固（VLS）界面对于基本了解表面化学如何影响工业过程和应用至关重要。通过用空心玻璃微球涂覆光滑的光滑表面来制造来自结构层次的超疏水表面。这些表面被称为结构分层修饰的微球表面（SHiMM）。使用环境扫描电子显微镜（ESEM）和高分辨率光学显微镜（OM）在微尺度上探测表观静态接触角（aSCA）为〜160°的SHiMM上水滴的两相LS和三相VLS界面）。ESEM和OM均确认了液滴外围接触线的VLS三相处存在3–150μm范围的气穴。使用能量分散光谱探测水滴内部LS界面的润湿特性，这与VLS三相观测很好地证实了这一点，从而证实了SHiMM既存在微米级气穴，也存在部分完全润湿。SHiMM上的超疏水水滴也表现出对SHiMM的相对较高的附着力-需要10°–40°的倾斜角才能将水滴从表面分离。半定量三相接触线分析和实验数据表明，aSCA的水含量较高，在微米级粗化SHiMM上的较大粘附力归因于探针液体在三重VLS和内部LS界面处的钉扎。

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Probing Liquid–Solid and Vapor–Liquid–Solid Interfaces of Hierarchical Surfaces Using High-Resolution Microscopy

Liquid–solid (LS) and vapor–liquid–solid (VLS) interfaces are important for the fundamental understanding of how surface chemistry impacts industrial processes and applications. Superhydrophobic surfaces, from structural hierarchies, were fabricated by coating flat smooth surfaces with hollow glass microspheres. These surfaces are referred to as structural hierarchical-modified microsphere surfaces (SHiMMs). Two-phase LS and three-phase VLS interfaces of water droplets on SHiMMs, with an apparent static contact angle (aSCA) of ∼160°, were probed at microscale using environmental scanning electron microscopy (ESEM) and high-resolution optical microscopy (OM). Both ESEM and OM confirmed the presence of air pockets in 3–150 μm range at the VLS triple-phase of the droplet peripheral contact line. The wetting characteristics of the LS interface in the interior of the water droplet were probed using energy-dispersive spectroscopy, which corroborated well with the VLS triple-phase observations, confirming the presence of both the microscale air pockets and fractional complete wetting of the SHiMMs. The superhydrophobic water droplets on the SHiMMs also exhibited relatively high adhesion to the SHiMMs—a tilt angle of 10°–40° was needed for detaching the droplets off the surfaces. Semiquantitative three-phase contact-line analysis and experimental data indicated high-water aSCA, and large adhesion on the microscale-roughened SHiMMs is attributed to pinning of the probe liquid both at the triple VLS and interior LS interfaces. The control over microroughness and surface chemistry of the SHiMMs will allow tuning of both the static and dynamic liquid–surface interactions.

更新日期：2018-02-28

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