Towards accurate evaluation of pressure-induced Cassie-to-Wenzel wetting transition on superhydrophobic surfaces DOI Creative Commons
Samo Jereb, Matic Može, Matevž Zupančič

et al.

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 694, P. 137697 - 137697

Published: April 28, 2025

Pressure-induced Cassie-to-Wenzel wetting transition is one of key impediments to implementation superhydrophobic interfaces in practical applications, yet it remains largely overlooked surface engineering, primarily due absence standardized evaluation procedures. Several studies demonstrated that the stability Cassie-Baxter regime can be evaluated by compressing a water droplet against and calculating Laplace pressure from droplet's curvature. However, their treatment geometry involved various simplifications, adversely affecting reliability estimation. Therefore, we hypothesize accounting for actual will improve accuracy evaluation. was hydrophobized silicon samples with micropillars, whilst measuring force exerted onto capturing side-view images compression process. The pressure, at which transitions homogeneous wetting, obtained fitting profile captured based on Young-Laplace equation, without adopting most common simplifications found literature. calculation validated strong agreement between simultaneous backlit imaging micro-force sensor measurements, average root mean square error value 27.71 μN measured forces up 2.5 mN, significant improvement compared available results our experimental different micro-topography indicate scales pillar height interpillar distance; furthermore, individual scaling factors are independent other geometric parameters.

Language: Английский

Towards accurate evaluation of pressure-induced Cassie-to-Wenzel wetting transition on superhydrophobic surfaces DOI Creative Commons
Samo Jereb, Matic Može, Matevž Zupančič

et al.

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 694, P. 137697 - 137697

Published: April 28, 2025

Pressure-induced Cassie-to-Wenzel wetting transition is one of key impediments to implementation superhydrophobic interfaces in practical applications, yet it remains largely overlooked surface engineering, primarily due absence standardized evaluation procedures. Several studies demonstrated that the stability Cassie-Baxter regime can be evaluated by compressing a water droplet against and calculating Laplace pressure from droplet's curvature. However, their treatment geometry involved various simplifications, adversely affecting reliability estimation. Therefore, we hypothesize accounting for actual will improve accuracy evaluation. was hydrophobized silicon samples with micropillars, whilst measuring force exerted onto capturing side-view images compression process. The pressure, at which transitions homogeneous wetting, obtained fitting profile captured based on Young-Laplace equation, without adopting most common simplifications found literature. calculation validated strong agreement between simultaneous backlit imaging micro-force sensor measurements, average root mean square error value 27.71 μN measured forces up 2.5 mN, significant improvement compared available results our experimental different micro-topography indicate scales pillar height interpillar distance; furthermore, individual scaling factors are independent other geometric parameters.

Language: Английский

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