Multiscale superhydrophobic zeolitic imidazolate framework coating for static and dynamic anti-icing purposes

Saeidiharzand, Shaghayegh and Sadaghiani, Abdolali and Yürüm, Alp and Koşar, Ali (2023) Multiscale superhydrophobic zeolitic imidazolate framework coating for static and dynamic anti-icing purposes. Advanced Materials Interfaces, 10 (15). ISSN 2196-7350

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Ice formation is a major challenge for engineering systems. Superhydrophobic surfaces constitute an effective approach to address this challenge. However, in addition to complex preparation methods, surface texture- and chemistry-related shortcomings reduce their effectiveness. In this study, a functionalized metal–organic framework (ZIF-8) based micro-nano-subnano scale coating (SuperHydrophobic Multiscale Coating – SHMC) with CA (contact angle) > 172°, rolling angle < 5°, and CAH (contact angle hysteresis) < 3° is developed and applied to metallic surfaces by spray coating. A fractal theory-based model of contact angle is adapted to reveal its non-wetting mechanism. SHMC extends the icing time by at least 300% and maintains its superhydrophobicity for > 30 icing/deicing cycles. The generated capillary pressure ranges within the multiscale coating are studied. The three-phase contact line characteristics including contact times, contact diameters, and interfacial heat transfer during droplet impact are assessed. A numerical model is developed using dynamic contact angle physics for transient heat transfer during the impact. Compared to the plain surface, which leads to instant icing at 60 ms after impact, no icing is observed on the developed coating. At least an order of magnitude reduction in heat transfer rate during the droplet contact time is obtained with SHMC.
Item Type: Article
Uncontrolled Keywords: anti-icing; contact line dynamics; droplet impact; metal-organic framework; micro-nano-subnano coating; superhydrophobic; ZIF-8
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Abdolali Khalili Sadaghiani
Date Deposited: 05 Aug 2023 16:24
Last Modified: 05 Aug 2023 16:24

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