Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces

Hosseini Biroun, Seyedmehdi, Haworth, Luke, Agrawal, Prashant, Orme, Bethany, McHale, Glen, Torun, Hamdi, Rahmati, Mohammad and Fu, Yongqing (2021) Surface Acoustic Waves to Control Droplet Impact onto Superhydrophobic and Slippery Liquid-Infused Porous Surfaces. ACS Applied Materials & Interfaces, 13 (38). pp. 46076-46087. ISSN 1944-8244

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Official URL: https:/doi.org/10.1021/acsami.1c09217

Abstract

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.

Item Type: Article
Additional Information: Funding information: This work was financially supported by the UK Engineering, and Physical Sciences Research Council (EPSRC) grants EP/P018998/1, EPSRC Network Plus in Digitalised Surface Manufacturing EP/S036180/1, and Special Interests Group of Acoustofluidics under the EPSRC funded UK Fluidic Network (EP/N032861/1). We also appreciate the support from EPSRC Centre for Doctoral Training in Renewable Energy Northeast Universities (ReNU) for funding through grant EP/S023836/1.
Uncontrolled Keywords: Surface acoustic wave, SLIPS, Superhydrophobic, Droplet impact, Contact time, Impact regime
Subjects: F200 Materials Science
H700 Production and Manufacturing Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 02 Sep 2021 10:55
Last Modified: 12 Oct 2021 13:50
URI: http://nrl.northumbria.ac.uk/id/eprint/47049

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