Creation of superhydrophobic wood surfaces by plasma etching and thin-film deposition
Creation of superhydrophobic wood surfaces by plasma etching and thin-film deposition
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通过等离子蚀刻和薄膜沉积创建超疏水木材表面
DOI：
10.1016/j.surfcoat.2015.09.052
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发表时间：
2015-11-15
影响因子：
5.4
通讯作者：
Hess, Dennis W.
中科院分区：
文献类型：
--
作者：
Xie, Linkun;Tang, Zhenguan;Hess, Dennis W.
利用氧气等离子体刻蚀和等离子体沉积薄膜相结合的方法制造了超疏水木材，以实现表面粗糙度和化学成分的必要组合。固有疏水性的氟碳薄膜(由五氟乙烷(PFE)前驱体制成)和亲水性类金刚石(DLC)涂层(由乙炔前驱体制成)都被用来生成高度憎水的基材。用扫描电子显微镜(SEM)和激光扫描共聚焦显微镜(LSCM)研究了氧等离子体刻蚀对表面粗糙度的影响。通过静态水接触角和液滴滑动角的测量确定了所得木材的润湿行为。在氟碳沉积之前经过O2等离子刻蚀的木材样品表现出低滑动角度的“滚落”超疏水性；在这项研究中，具有最极端润湿性能的样品具有迄今为止报道的改性木材基材的最高水接触角和最低滑动角度(WCA值为161.2度+/-1.5度，滑动角度类似于15度)，而不影响木材的视觉外观。由于我们能够控制粗糙度，涂有亲水性DLC膜的蚀刻样品显示出超疏水行为(WCA)，尽管表面是“粘性的”，因为水滴不会从垂直保持的衬底上滑动或脱离。(C)2015爱思唯尔B.V.保留所有权利。
Superhydrophobic wood has been created using a combination of O-2 plasma etching and plasma deposition of thin films to achieve the necessary combination of surface roughness and chemistry. Inherently hydrophobic fluorocarbon films (from pentafluoroethane (PFE) precursor) and hydrophilic diamond-like carbon (DLC) coatings (from acetylene precursor) were both used to create highly water repellent substrates. The effect of O-2 plasma etching on surface roughness was investigated using Scanning Electron Microscopy (SEM) and Laser Scanning Confocal Microscope (LSCM) profilomeny. The wetting behavior of the resulting wood was determined by static water contact angle and droplet sliding angle measurements. Wood samples subjected to O-2 plasma etching prior to fluorocarbon deposition exhibited "roll-off" superhydrophobicity with low sliding angles; the sample in this study with the most extreme wetting properties has the highest water contact angle and lowest sliding angle reported to date for modified wood substrates (WCA 161.2 degrees +/- 1.5 degrees and sliding angle similar to 15 degrees), without affecting visual appearance of the wood. Due to our ability to control roughness, etched samples that were coated with hydrophilic DLC films displayed superhydrophobic behavior (WCA), although the surface was "sticky" in that water droplets did not slide or dislodge from vertically-held substrates. (C) 2015 Elsevier B.V. All rights reserved.