Enhancing Resistance to Wetting Transition through the Concave Structures

© 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 37(2025), 1 vom: 01. Jan., Seite e2409389
1. Verfasser: Lee, Jinhoon (VerfasserIn)
Weitere Verfasser: Park, Jinwoo, Jung, Kwang Hui, Lee, Seunghyun, Lee, Jeong Jun, Wooh, Sanghyuk, Lee, Dong Woog
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2025
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article Laplace pressure Weber number concave pillar plastron superhydrophobic
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520 |a Water-repellent superhydrophobic surfaces are ubiquitous in nature. The fundamental understanding of bio/bio-inspired structures facilitates practical applications surmounting metastable superhydrophobicity. Typically, the hierarchical structure and/or reentrant morphology have been employed hitherto to suppress the Cassie-Baxter to Wenzel transition (CWT). Herein, a new design concept is reported, an effect of concave structure, which is vital for the stable superhydrophobic surface. The thermodynamic and kinetic stabilities of the concave pillars are evaluated by continuous exposure to various hydrostatic pressures and sudden impacts of water droplets with various Weber numbers (We), comparing them to the standard superhydrophobic normal pillars. Specifically, the concave pillar exhibits reinforced impact resistance preventing CWT below a critical We of ≈27.6, which is ≈1.6 times higher than that of the normal pillar (≈17.0). Subsequently, the stability of underwater air film (plastron) is investigated at various hydrostatic pressures. The results show that convex air caps formed at the concave cavities generate downward Laplace pressure opposing the exerted hydrostatic pressure between the pillars, thus impeding the hydrostatic pressure-dependent underwater air diffusion. Hence, the effects of trapped air caps contributing to the stable Cassie-Baxter state can offer a pioneering strategy for the exploration and utilization of superhydrophobic surfaces 
650 4 |a Journal Article 
650 4 |a Laplace pressure 
650 4 |a Weber number 
650 4 |a concave pillar 
650 4 |a plastron 
650 4 |a superhydrophobic 
700 1 |a Park, Jinwoo  |e verfasserin  |4 aut 
700 1 |a Jung, Kwang Hui  |e verfasserin  |4 aut 
700 1 |a Lee, Seunghyun  |e verfasserin  |4 aut 
700 1 |a Lee, Jeong Jun  |e verfasserin  |4 aut 
700 1 |a Wooh, Sanghyuk  |e verfasserin  |4 aut 
700 1 |a Lee, Dong Woog  |e verfasserin  |4 aut 
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773 1 8 |g volume:37  |g year:2025  |g number:1  |g day:01  |g month:01  |g pages:e2409389 
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