An experimental study to characterize a surface treated with a novel laser surface texturing technique: Water repellency and reduced ice adhesion
An experimental study to characterize a surface treated with a novel laser surface texturing technique: Water repellency and reduced ice adhesion
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DOI：
10.1016/j.surfcoat.2019.06.046
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发表时间：
2019-09-25
影响因子：
5.4
通讯作者：
Ding, Hongtao
中科院分区：
文献类型：
--
作者：
Liu, Yang;Zhang, Zichen;Ding, Hongtao
进行了一项实验研究，以表征使用新型纳秒激光高通量表面纳米结构 (nHSN) 方法制造的激光纹理表面。虽然详细描述了在金属表面产生超疏水性的两步 nHSN 方法（即水限制纳秒激光纹理和化学浸入处理），但还根据特定激光扫描时间（SLST）对不同基于激光的表面纹理方法进行了吞吐量分析。研究发现，与现有的基于超短激光的表面纹理技术相比，nHSN 工艺将加工速率从每平方英寸数百分钟显着提高到数秒。为了检验新型nHSN处理的表面在“拒水/防冰”方面的性能，本研究进行了一系列实验，不仅表征了nHSN处理的铝表面的表面结构和润湿性，而且还评估了nHSN处理对水滴在撞击过程中（即扩散、后退、后退）动力学的影响。 和反弹），以及它们降低冰粘附强度的能力。研究发现，未经处理的裸铝表面和唯一激光纹理化的铝表面是亲水的，静态接触角小于 90 度，接触角滞后大于 90 度，而 nHSN 处理的表面似乎是超疏水的，具有明显更大的静态接触角（即，类似于 170 度）和小得多的接触角 滞后（即，类似于 20 度）。通过动态水滴撞击过程中的完全水滴反弹现象和冰粘附强度的降低，nHSN表面的超疏水性进一步提升为“防冰性”。
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.