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An intelligent icephobic coating based on encapsulated phase change materials (PCM)

Shamshiri Mohammadreza, Jafari Reza et Momen Gelareh. (2022). An intelligent icephobic coating based on encapsulated phase change materials (PCM). Colloids and Surfaces A: Physicochemical and Engineering Aspects, 655, e130157.

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The phase change materials (PCMs) have attracted great interest for applications as smart icephobic coatings because of their capability to restore and release energy. PCMs release a large amount of energy as latent heat upon freezing, which is a stimuli-response behavior for anti-icing applications. Such materials embedded within coatings can be applied to exposed infrastructures to protect them against icing. Here, we encapsulated a mixture of PCMs in a urea–formaldehyde (UF) shell by in situ polymerization and then incorporated the microcapsules into a polydimethylsiloxane (PDMS) coating. Microcapsules 5–15 µm in diameter having a shell thickness of about 200 nm were fabricated. Investigating the chemical composition of the fabricated microcapsules confirmed that PCM material was successfully encapsulated within the UF shell. Moreover, the differential scanning calorimetry (DSC) analysis showed that the PCM preserved its phase-change characteristics when encapsulated and embedded within the matrix. Increasing the abundance of microcapsules within the coating lowered the ice nucleation temperature, verified by DSC, and increased the freezing-delay time because of PCM latent heat release. We utilized a custom-made apparatus, called micro-push-off set-up that allowed us to measure ice adhesion at the exact moment that the water droplet was completely frozen. Therefore, it was observed that the presence of the PCM microcapsules reduced ice adhesion strength, through either possible mechanism of the formation of quasi-liquid layer (QLL) or thermal expansion differences. Furthermore, lower ice adhesion resulted in reduced ice accumulation on the PCM-containing coatings, verified by the static accumulation test (SAT).

Type de document:Article publié dans une revue avec comité d'évaluation
Version évaluée par les pairs:Oui
Date:20 Décembre 2022
Identifiant unique:10.1016/j.colsurfa.2022.130157
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Unités de recherche > Centre international de recherche sur le givrage atmosphérique et l’ingénierie des réseaux électriques (CENGIVRE) > Laboratoire des revêtements glaciophobes et ingénierie des surfaces (LaRGIS)
Mots-clés:icephobicity, phase change materials (PCMs), latent heat, smart coatings, ice adhesion, ice accumulation, glacephobicité, matériaux à changement de phase (PCM), chaleur latente, revêtements intelligents, adhésion à la glace, accumulation de glace
Déposé le:21 déc. 2022 17:08
Dernière modification:08 févr. 2023 20:07
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