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A non-fluorinated mechanochemically robust volumetric superhydrophobic nanocomposite

Vazirinasab Elham, Momen Gelareh et Jafari Reza. (2021). A non-fluorinated mechanochemically robust volumetric superhydrophobic nanocomposite. Journal of Materials Science and Technology, 66, p. 213-225.

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URL officielle: http://dx.doi.org/doi:10.1016/j.jmst.2020.06.029

Résumé

The widespread use of water-repellent superhydrophobic surfaces is limited by the inherent fragility of their micro- and nanoscale roughness, which is prone to damage and degradation. Here, we report a non-fluorinated volumetric superhydrophobic nanocomposites that demonstrate mechanochemical robustness. The nanocomposites are produced through the addition of microscale diatomaceous earth and nanoscale fumed silica particles to high-temperature vulcanized silicone rubber. The water-repellency of the surface and bulk of nanocomposites having 120 phr of filler was determined based on the water contact angle and contact angle hysteresis. We compared the water-repellency of nanocomposites of differing diatomaceous earth to fumed silica mass ratios. Increasing the amount of diatomaceous earth enhanced the water-repellency of the nanocomposite surface, whereas an increased amount of fumed silica improved the water-repellency of the bulk material. Moreover, increasing the diatomaceous earth/fumed silica mass ratio improved the cross-linking density and hardness values of the nanocomposite. Despite being subjected to a range of mechanical durability tests, including sandpaper abrasion, knife scratching, tape peeling, water jet impact, and sandblasting, the nanocomposite maintained a water contact angle of 163° and contact angle hysteresis of 2°. When the water-repellency of the prepared nanocomposites eventually deteriorated, we restored their superhydrophobicity by removing the upper surface of the nanocomposite. This extraordinary robustness stems from the embedded low surface energy micro/nanostructures distributed throughout the nanocomposite. We also demonstrated the chemical stability, UV resistance, and self-cleaning abilities of the nanocomposite to illustrate the potential for real-life applications of this material.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:66
Pages:p. 213-225
Version évaluée par les pairs:Oui
Date:10 Mars 2021
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: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:volumetric superhydrophobic, nanocomposite, diatomaceous earth, hierarchical micro/nanostructure, mechanical robustness, chemical stability, self-cleaning, superhydrophobe volumétrique, terre à diatomées, micro/nanostructure hiérarchique, robustesse mécanique, stabilité chimique, autonettoyant
Déposé le:15 juin 2021 18:15
Dernière modification:15 juin 2021 18:15
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