Plant leaves icephobicity / Elabeh Alizadeh-Birjandi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 5 (09/2017) . - p. 1061-1067 Titre : Plant leaves icephobicity Type de document : texte imprimé Auteurs : Elabeh Alizadeh-Birjandi, Auteur ; H. Pirouz Kavehpour, Auteur Année de publication : 2017 Article en page(s) : p. 1061-1067 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie biomimétique Hydrophobie Revêtements antigel Index. décimale : 667.9 Revêtements et enduits Résumé : Ice adhesion and accumulation are well known to cause serious problems for different structures such as wind turbines, power transmission and distribution systems, and aircraft. Development of coatings that can resist icing can solve many challenges in various areas of industry. This work was inspired by nature and ice resistivity and superhydrophobicity of plants leaves. Kale is a winter plant with superhydrophobic behaviors, which is normally known as an advantage for cleaning the leaves; however, this article reveals that kale leaves have special surface microstructures delaying the ice formation initiation making them good candidates for designing ice-repellent coatings. In-depth experimental analyses, IR thermography, contact angle measurements, and scanning electron microscopy of the leaves were performed to discover how different plants can prevent icing and further find an optimal design for an artificial ice-repellent coating. Note de contenu : Fig. 1. Optical images of the freezing experiments on lettuce and kale leaves. Images are processed to measure the contact angle of a water droplet on the plants leaves. The average static contact angles of water droplet on the (a) lettuce and (b) kale leaves at 210°C are 74.28° and 147.16°, respectively Fig. 2. Growth of freezing front for a droplet on kale and lettuce leaves vs time. For a droplet on the kale leaf with higher contact angle, the growth of freezing front is gradual Compared to the lettuce leaf Fig. 3. The video frames of the freezing process of the water droplet at room temperature on the lettuce and kale leaves at 210°C Fig. 4. The IR camera images of the heat transfer process for a droplet on the kale and lettuce leaves. The plot at the Bottom shows the time rate of change of nondimensional temperature of the droplet on both leaves. Here, T0 and Ti refer to temperature of the substrate (20°C) and initial temperature of the drop (70°C), respectively Fig. 5. The SEM images of the surface and shaft of the lettuce and kale leaves. The microstructure on the surface of the leaves seems to be different, while the shafts have the similar patterns Fig. 6. Schematic of the experimental setup on a drop shape analyzer (KRÃœSS, DSA 100) equipped with a temperature- controlled environmental chamber and a Peltier plate to set and monitor the temperature DOI : 10.1007/s11998-017-9988-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9988-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29141 [article]

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