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Topographical length scales of hierarchical superhydrophobic surfaces

机译：分层超疏水表面的地形长度尺度

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摘要

The morphology of hydrophobic CF_4 plasma fluorinated polybutadiene surfaces has been characterised using atomic force microscopy (AFM). Judicious choice of the plasma power and exposure duration leads to formation of three different surface morphologies (Micro, Nano, and Micro+ Nano). Scaling theory analysis shows that for all three surface topographies, there is an initial increase in roughness with length scale followed by a levelling-off to a saturation level. At length scales around 500 nm, it is found that the roughness is very similar for all three types of surfaces, and the saturation roughness value for the Micro + Nano morphology is found to be intermediate between those for the Micro and Nano surfaces. Fast Fourier Transform (FFT) analysis has shown that the Micro + Nano topography comprises a hierarchical superposition of Micro and Nano morphologies. Furthermore, the Micro + Nano surfaces display the highest local roughness (roughness exponent α=0.42 for length scales shorter than ～500 nm), which helps to explain their superhydrophobic behaviour (large water contact angle (＞170°) and low hysteresis (＜1°)).
机译：疏水CF_4等离子体氟化聚丁二烯表面的形态已使用原子力显微镜（AFM）进行了表征。等离子体功率和曝光时间的明智选择会导致形成三种不同的表面形态（微米，纳米和微米+纳米）。比例缩放理论分析表明，对于所有三个表面形貌，粗糙度随长度比例的增加而初始增加，随后逐渐趋于饱和。在大约500 nm的长度尺度上，发现所有三种类型的表面的粗糙度都非常相似，并且发现Micro + Nano形态的饱和粗糙度值介于Micro和Nano表面的粗糙度之间。快速傅立叶变换（FFT）分析表明，微米+纳米形貌包含微米和纳米形貌的分层叠加。此外，Micro + Nano表面表现出最高的局部粗糙度（长度尺度小于〜500 nm时，粗糙度指数α= 0.42），这有助于解释它们的超疏水行为（大的水接触角（＞ 170°）和低的滞后性（＜ 1°））。

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  • 来源
    《Applied Surface Science》 |2014年第30期|1068-1074|共7页
  • 作者

    P.K. Dhillon; P.S. Brown; C.D. Bain; J.P.S. Badyal; S. Sarkar;

  • 作者单位

    Department of Physics, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India;

    Department of Chemistry, Science Laboratories, Durham University, Durham DH1 3LE, England, UK;

    Department of Chemistry, Science Laboratories, Durham University, Durham DH1 3LE, England, UK;

    Department of Chemistry, Science Laboratories, Durham University, Durham DH1 3LE, England, UK;

    Department of Physics, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India;

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  • 正文语种 eng
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  • 关键词

    Hydrophobicity; Dynamic scaling theory; Length scales; Roughness;

    机译：疏水性动态缩放理论;长度刻度;粗糙度;

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