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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: Wetting, Fluidics and Liquids at Interfaces and Surfaces I (joint session CPP/DY)
CPP 10.1: Talk
Monday, March 17, 2025, 16:15–16:30, H34
Beyond contact angle measurements of aerophilic surfaces — •Alexander Tesler1, Wolfgang Goldmann1, Anca Mazare2, Ben Fabry1, Stefan Kolle3, Robin A.H. Ras4, Heikki Nurmi4, George Sarau5, and Silke Christiansen5 — 1Biophysics Chair, Erlangen, Germany — 2WW4-LKO, Erlangen, Germany — 3UCSD, San Diego, USA — 4Aalto University, Epsoo, Finland — 5Fraunhofer Institute, Forchheim, Germany
Aerophilicity can provide surface resilience to the detrimental effects of wetting-related phenomena. However, the development of such superhydrophobic surfaces with a long-lasting entrapped air layer, called plastron, is hampered by the lack of evaluation criteria and methods that can unambiguously distinguish between stable and metastable Cassie-Baxter wetting regimes. The information to evaluate the stability of the wetting regime is missing from the commonly used contact angle goniometry. Therefore, it is necessary to determine which surface features can be used as a signature to identify thermodynamically stable plastron. Here, I describe a methodology for evaluating the thermodynamic underwater stability of the Cassie-Baxter wetting regime of superhydrophobic surfaces by measuring the surface roughness, solid-liquid area fraction, and Young’s contact angle. The method allowed the prediction of passive plastron stability for over one year of continuous submersion,[1] impeding mussel and barnacle adhesion,[2] and inhibition of metal corrosion in seawater.[3] [1] Tesler et al., Commun. Mater. 2024, 5, 112. [2] Tesler et al., Nat. Mater. 2023, 22, 1548. [3] Prado et al., Adv. Funct. Mater. 2024, 35, 2407444.
Keywords: Plastron; Thermodynamic stability; Underwater; Solid-liquid area fraction; Optical microscopy