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Abstract / Description of output
Droplets impacting superhydrophobic surfaces have been extensively studied due to their compelling scientific insights and important industrial applications. In these cases, the commonly reported impact regime was that of complete rebound. This impact regime strongly depends on the nature of the superhydrophobic surface. Here, we report the dynamics of droplets impacting three hydrophobic slippery surfaces, which have fundamental differences in normal liquid adhesion, and lateral static and kinetic liquid friction. For an air cushion-like (super)hydrophobic solid surface (Aerogel) with low adhesion and low static and low kinetic friction, complete rebound can start at a very low Weber (We) number (~1). For slippery liquid-infused porous (SLIP) surfaces with high adhesion and low static and low kinetic friction, complete rebound only occurs at a much higher We number (>5). For a slippery omniphobic covalently attached liquid-like (SOCAL) solid surface, with high adhesion and low static friction similar to SLIPS, but higher kinetic friction, complete rebound was not observed, even for We as high as 200. Furthermore, the droplet ejection volume after impacting the Aerogel surface is 100% across the whole range of We numbers tested compared to other surfaces. In contrast, droplet ejection for SLIPs was only observed consistently when We was above 5-10. For SOCAL, 100% (or near 100%) ejection volume was not observed even at the highest We number tested here (~200). This suggests droplets impacting our (super)hydrophobic Aerogel and SLIPS lose less kinetic energy. These insights into the differences between normal adhesion and lateral friction properties can be used to inform the selection of surface properties to achieve the most desirable droplet impact characteristics to fulfil a wide range of applications, such as de-icing, inkjet printing, and microelectronics.
See also correction at https://pubs.acs.org/doi/10.1021/acsami.3c16610
See also correction at https://pubs.acs.org/doi/10.1021/acsami.3c16610
Original language | English |
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Journal | ACS Applied Materials & Interfaces |
Early online date | 29 Dec 2022 |
DOIs | |
Publication status | E-pub ahead of print - 29 Dec 2022 |
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Dive into the research topics of 'Dynamics of Droplets Impacting on Aerogel, Liquid Infused, and Liquid-Like Solid Surfaces'. Together they form a unique fingerprint.Projects
- 1 Finished
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Biofilm Resistant Liquid-like Solid Surfaces in Flow Situations
McHale, G., Ledesma Aguilar, R. & Wells, G.
1/09/21 → 31/08/24
Project: Research
Research output
- 1 Article
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Correction to “Dynamics of Droplets Impacting on Aerogel, Liquid Infused, and Liquid-Like Solid Surfaces”
Dawson, J., Coaster, S., Han, R., Gausden, J., Liu, H., Mchale, G. & Chen, J., 29 Nov 2023, In: ACS Applied Materials & Interfaces. 15, 47, p. 55195-55199Research output: Contribution to journal › Article › peer-review
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