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<p>Inspired by nanostructured surfaces of animals and plants in nature, artificial nanostructured surfaces have been widely used in water-proofing and electronic fields. However, wetting instability in static and dynamic states limits their application. In this work, anodic aluminum oxide (AAO) foils with dual-scale nanopores, consisting of 300&#xa0;nm hexagonal pits and 70&#xa0;nm elliptical nanopores, were used as customizable templates. The dual-scale features in template were thermally transferred onto the polypropylene/graphene (PP/GP) surface by compression molding, facilitating formation of dual-scale nanopillars. As expected, the dual-scale nanostructured PP/GP surface maintain the maximum Contact angle (CA) at about 164°. Further, they were immersed on the bottom of the measuring cylinder at the depth of about 370&#xa0;mm with a hydrostatic pressure difference of 3626&#xa0;Pa for 60&#xa0;min, exhibiting a stable superhydrophobic state. The droplet impact test demonstrates that the gap between the dual-scale nanostructures can be infiltrated at Weber number (We) of greater than 48.38 for the droplet, and then the local pinning phenomenon occurs. The droplet can bounce off from the dual-scale nanostructured PP/GP surface to the maximum height of 13.3&#xa0;mm at We of 55.32.</p> Graphical abstract <p></p>

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Dual-scale nanopillared polypropylene/graphene surfaces with droplet impact robustness

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Yameng Pei,
  • Zhibin Liu,
  • Fengmin Lu,
  • Wengang Yang,
  • Yanmei Zhang,
  • Caihong Lei,
  • Anfu Chen,
  • Lijia Huang

摘要

Inspired by nanostructured surfaces of animals and plants in nature, artificial nanostructured surfaces have been widely used in water-proofing and electronic fields. However, wetting instability in static and dynamic states limits their application. In this work, anodic aluminum oxide (AAO) foils with dual-scale nanopores, consisting of 300 nm hexagonal pits and 70 nm elliptical nanopores, were used as customizable templates. The dual-scale features in template were thermally transferred onto the polypropylene/graphene (PP/GP) surface by compression molding, facilitating formation of dual-scale nanopillars. As expected, the dual-scale nanostructured PP/GP surface maintain the maximum Contact angle (CA) at about 164°. Further, they were immersed on the bottom of the measuring cylinder at the depth of about 370 mm with a hydrostatic pressure difference of 3626 Pa for 60 min, exhibiting a stable superhydrophobic state. The droplet impact test demonstrates that the gap between the dual-scale nanostructures can be infiltrated at Weber number (We) of greater than 48.38 for the droplet, and then the local pinning phenomenon occurs. The droplet can bounce off from the dual-scale nanostructured PP/GP surface to the maximum height of 13.3 mm at We of 55.32.

Graphical abstract