4.6 Article

Anisotropic Ice Adhesion of Micro-Nano-Structured Metal Surface by a Femtosecond Laser

Journal

LANGMUIR
Volume 37, Issue 31, Pages 9571-9576

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c01459

Keywords

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Funding

  1. National Natural Science Foundation of China [51976015, 61605017]
  2. Science and Technology Department of Jilin Province [20200201250JC]
  3. 111 Project of China [D17017]
  4. Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing
  5. Key Laboratory of Ultrafast and Extreme Violet Optics, Jilin Province

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This study investigated the direction-dependent ice adhesion strength on groove-shaped micro-nano-structured aluminum alloy surfaces formed using a femtosecond laser. The anisotropic ice adhesion strength was found to be attributed to changes in wettability and morphology in different directions. Understanding anisotropic ice adhesion is crucial for designing and applying icephobic materials with micro-nano-structured surfaces.
The icephobic materials induced using micro-nano-structured surfaces have aroused great attention for promising applications. Previously, the characterization of ice adhesion of icephobic materials by shear force is usually performed without direction discrimination along the surface whatever the surface is anisotropic or not. In this work, we studied the direction-dependent ice adhesion strength on groove-shaped micro-nano-structured aluminum alloy surfaces formed using a femtosecond laser. It is found that the ice adhesion strength on the surfaces exhibits anisotropy, which corresponds to a smaller ice adhesion strength in the direction parallel to the groove than that orthogonal to the groove. Furthermore, it is found that the ice adhesion strength decreases with the increase in groove width in the orthogonal direction, while it does not change much in the parallel direction. The anisotropic ice adhesion strength is attributed to the change of wettability and morphology in the two directions. The findings in this work suggest that anisotropic ice adhesion should be fully considered when designing an icephobic micro-nano-structured metal structure, which is of great significance to the characterization and application of icephobic materials.

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