Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces,ACS Applied Materials & Interfaces

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Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-09-14 , DOI: 10.1021/acsami.1c09217
Mehdi H Biroun _{1,

2} , Luke Haworth ₁ , Prashant Agrawal ₁ , Bethany Orme ₁ , Glen McHale ₃ , Hamdi Torun ₁ , Mohammad Rahmati ₁ , YongQing Fu ₁

Affiliation

Superhydrophobic coatings and slippery liquid-infused porous surfaces (SLIPS) have shown their potentials in self-cleaning, anti-icing, anti-erosion, and antibiofouling applications. Various studies have been done on controlling the droplet impact on such surfaces using passive methods such as modifying the lubricant layer thickness in SLIPS. Despite their effectiveness, passive methods lack on-demand control over the impact dynamics of droplets. This paper introduces a new method to actively control the droplet impact onto superhydrophobic and SLIPS surfaces using surface acoustic waves (SAWs). In this study, we designed and fabricated SLIPS on ZnO/aluminum thin-film SAW devices and investigated different scenarios of droplet impact on the surfaces compared to those on similar superhydrophobic-coated surfaces. Our results showed that SAWs have insignificant influences on the impact dynamics of a porous and superhydrophobic surface without an infused oil layer. However, after infusion with oil, SAW energy could be effectively transferred to the droplet, thus modifying its impact dynamics onto the superhydrophobic surface. Results showed that by applying SAWs, the spreading and retraction behaviors of the droplets are altered on the SLIPS surface, leading to a change in a droplet impact regime from deposition to complete rebound with altered rebounding angles. Moreover, the contact time was reduced up to 30% when applying SAWs on surfaces with an optimum oil lubricant thickness of ∼8 μm. Our work offers an effective way of applying SAW technology along with SLIPS to effectively reduce the contact time and alter the droplet rebound angles.

中文翻译：

表面声波控制液滴撞击超疏水和光滑的液体注入多孔表面

超疏水涂层和光滑的液体注入多孔表面 (SLIPS) 在自清洁、防冰、防腐蚀和防生物污垢应用中显示了它们的潜力。已经进行了各种研究，以使用被动方法控制液滴对此类表面的影响，例如修改 SLIPS 中的润滑剂层厚度。尽管它们有效，但被动方法缺乏对液滴撞击动力学的按需控制。本文介绍了一种使用表面声波 (SAW) 主动控制液滴撞击超疏水和 SLIPS 表面的新方法。在这项研究中，我们在 ZnO/铝薄膜 SAW 器件上设计和制造了 SLIPS，并研究了与类似的超疏水涂层表面相比，液滴撞击表面的不同情况。我们的结果表明，SAW 对没有注入油层的多孔和超疏水表面的冲击动力学影响不大。然而，在注入油后，SAW 能量可以有效地转移到液滴上，从而改变其对超疏水表面的冲击动力学。结果表明，通过应用 SAW，液滴在 SLIPS 表面上的扩散和回缩行为发生了改变，导致液滴撞击状态从沉积到完全回弹发生变化，回弹角度改变。此外，当在最佳油润滑剂厚度为~8μm 的表面上应用 SAW 时，接触时间减少了 30%。我们的工作提供了一种将 SAW 技术与 SLIPS 一起应用以有效减少接触时间并改变液滴回弹角的有效方法。

更新日期：2021-09-29

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