An experimental study to characterize a surface treated with a novel laser surface texturing technique: Water repellency and reduced ice adhesion

SURFACE & COATINGS TECHNOLOGY

卷:374

Article

Liu, Yang¹  Zhang, Zichen¹  Hu, Haiyang¹  Hu, Hui¹  Samanta, Avik²  Wang, Qinghua²  Ding, Hongtao² 

[1] Iowa State Univ, Dept Aerosp Engn, 2271 Howe Hall,Room 1200, Ames, IA 50011 USA

[2] Univ Iowa, Dept Mech Engn, Iowa City, IA 52242 USA

关键词: Laser surface nanostructuring;    Wettability and icephobicity;    Water droplet impingement;    Ice adhesion strength;   

DOI  :  10.1016/j.surfcoat.2019.06.046

来源: Elsevier

【 摘 要 】

An experimental study was conducted to characterize the laser-textured surfaces fabricated by using a novel nanosecond Laser-based High-throughput Surface Nanostructuring (nHSN) method. While the two-step nHSN approach (i.e., water-confined nanosecond laser texturing and chemical immersion treatment) in producing superhydrophobicity over metal surfaces is described in great details, a throughput analysis of different laser-based surface texturing methods is also performed in the term of Specific Laser Scanning Time (SLST). It is found that the nHSN process significantly increases the processing rate from hundreds of minutes per square inch to seconds in comparison to the existing ultrashort laser-based surface texturing techniques. In order to examine the performance of the novel nHSN-treated surfaces in the term of water-/ice-repellency, a series of experiments were performed in the present study to not only characterize the surface structures and wettability of the nHSN-treated aluminum surfaces, but also evaluate the effects of the nHSN treatment on the dynamics of water droplet during the impacting process (i.e., spreading, receding, and rebounding), as well as their capability in reducing ice adhesion strength. It is found that, while the untreated bare aluminum surface and the only laser-textured aluminum surface are hydrophilic with the static contact angle being smaller than 90 degrees and the contact angle hysteresis being larger than 90 degrees, the nHSN-treated surfaces appear to be superhydrophobic with a significantly larger static contact angle (i.e., similar to 170 degrees) and a much smaller contact angle hysteresis (i.e., similar to 20 degrees). The superhydrophobicity of the nHSN surfaces is further promoted to ice-repellency by the complete droplet rebounding phenomenon in the dynamic water droplet impacting process and the reduced ice adhesion strength.

【 授权许可】

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