采用纳秒激光在金属表面低成本地制备微纳结构,再对其进行改性就可以获得水黏附力具有差异的超疏水表面,但目前对这些超疏水表面液滴冲击性能的研究还尚少,鉴于此,研究了不同脉宽纳秒激光制备的典型超疏水表面的液滴冲击性能。结果表明:采用不同脉宽纳秒激光制备的超疏水表面在液滴冲击时都具有极短的固液接触时间;在相同的参数下,窄脉宽激光制备的超疏水表面具有更高的微米结构,导致液滴冲击时的固液黏附力增大,从而具有相对较长的固液接触时间。

Low cost nanosecond lasers can be used to fabricate various micro and nanostructures on metal surfaces. After chemical modification, superhydrophobic surfaces with different water adhesion are obtained. However, only few studies are reported on the droplet impact performance of these superhydrophobic surfaces. Therefore, we investigate the droplet impact performance of the typical superhydrophobic surfaces fabricated by nanosecond laser with different pulse duration. Results indicate that the superhydrophobic surfaces fabricated by different pulse duration nanosecond lasers exhibit extremely short solid-liquid contact time when droplets are impacted. Under the same parameters, superhydrophobic surface fabricated by shorter pulse duration laser has higher microstructures, which results in an increase in the solid-liquid adhesion force during droplet impact and a relatively long solid-liquid contact time.